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1

Resilience factors in Vietnam’s cross-border e-commerce logistics: A fuzzy decision framework

Nguyen Phi-Hung, Nguyen Lan-Anh Thi

LogForum

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2025

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Vol. 21, no 3

459--472

EN

Background: The rapid growth of global e-commerce has heightened the need for resilient cross-border supply chains, particularly in emerging markets such as Vietnam. These supply chains are increasingly exposed to complex disruptions arising from health crises, regulatory shifts, and logistical constraints. Purpose: This study aims to identify and prioritize the key factors influencing supply chain resilience in Vietnam’s cross-border e-commerce (CBE) sector, and to analyze how these factors interrelate under conditions of uncertainty. Methods: A two-phase fuzzy multi-criteria decision-making framework was employed, integrating the Fuzzy Delphi method and Fuzzy Decision-Making Trial and Evaluation Laboratory (DEMATEL). Expert input was collected from a total of 25 professionals in logistics and CBE to evaluate and model the causal relationships among resilience factors. Results: Twelve critical dimensions were validated, with Risk Assessment and Mitigation Strategies (RAMS), Inventory Management (IM), and Pandemics and Health Crises (PHC) identified as the most influential. PHC and Information Technology and Connectivity (ITC) emerged as root causes driving the resilience network, with PHC exerting strong direct effects on RAMS and IM. Implications: The findings highlight the importance of strengthening preparedness for health-related disruptions and investing in digital infrastructure to enhance resilience in Vietnam’s CBE logistics. The proposed framework provides both theoretical insights and practical strategies for policymakers and managers seeking adaptive and robust supply chains.

2

Resources of decorative stones in Bac Kan province, Vietnam

To Xuan Ban, Nguyen Huu Trong

Inżynieria Mineralna

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2025

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Vol. 2, no. 1

27--43

EN

Bac Kan province locates in the Northeast of Vietnam, formed through geological periods hundreds of millions of years ago. Various thermotectonic activities have resulted in the formation of geological structures, containing different types of rocks, some of which have beautiful colors and can be mined and crafted as products of decorative stones. The combination of endogenous and exogenous activities has created diverse resources of decorative stones in Bac Kan province. On the basic investigation and survey works, sample collection and analysis of material composition, physical and mechanical properties, and artistic quality, several samples have been selected for crafting. As a result, 20 ressource sites of decorative stones have been recorded in Bac Kan province. Among these sites, marbles, banded limestones, magmatic and alkaline rocks show promising potential. Most of the decorative stone sites are easily accessible by means of transportation. The great diversity of decorative stone resources also contributes to supporting and promoting local tourism development.

3

Renewable Energy in Vietnam: Figures and Future Scope for Net-Zero Target

Nguyen Cong Cuong, Le Xuan Thanh

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

495--515

EN

Vietnam has emerged as one of the most dynamic renewable energy (RE) markets in Southeast Asia, marked by impressive growth in solar and wind power. This paper aims to analyze key figures on renewable energy development in Vietnam, review legal and technical barriers, and assess the evolving policy framework towards achieving the national Net-Zero target by 2050. Between 2015 and 2021, solar capacity rose from under 100 MW to more than 18 GW, largely fueled by supportive Feed-in Tariff (FIT) policies under Decision No. 11/2017/QD-TTg and Decision No. 13/2020/QD-TTg. Wind energy also expanded, reaching about 4 GW by 2023. By 2024, renewables accounted for nearly 30% of national electricity capacity. However, challenges persist. Post-FIT uncertainty, delays in PDP8, grid congestion, and the lack of advanced storage or forecasting limit system flexibility. These issues hinder private investment, compounded by the absence of a mature carbon pricing framework. In response, Vietnam has shifted from FITs to competitive bidding schemes, with pilot auctions planned, while also drafting a carbon market framework to mobilize climate finance. The paper highlights that PDP8 (National Power Development Plan VIII), approved in 2023, sets ambitious goals: renewables to supply 47% of electricity by 2030. Policy adjustments now integrate carbon cost considerations, promoting sustainability. Furthermore, Vietnam is collaborating with international partners to enhance grid standards, develop recycling solutions for end-of-life solar panels, and apply ESG (Environmental, Social, and Governance) practices. The research provides a comprehensive overview of achievements, identifies bottlenecks, and evaluates future directions for Vietnam’s renewable energy sector, underlining its critical role in realizing the Net-Zero 2050 commitment.

4

Key Motives for the Internationalization of Firms: the Case of Polish Enterprises Expanding into the Vietnamese Market

Nguyen Cao Son, Jeżak Jan

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

727--735

EN

This paper investigates the motives driving Polish multinational enterprises (MNEs) to expand into the Vietnamese market, a rapidly growing destination in Southeast Asia with increasing relevance in global trade dynamics. It explores both internal and external factors influencing market entry decisions, including, inter alia, possession of unique knowledge about the Vietnamese market or local partners, a drive for enterprise development and the achievement of long-term goals, personal commitment and motivation of management, saturation in existing markets, and new opportunities in the Vietnamese market arising from the entry into force of the EU-Vietnam Free Trade Agreement (EVFTA) in 2020. Drawing on quantitative data gained from a survey of 56 Polish MNEs operating in Vietnam, the study provides empirical evidence of the dynamic and multi-dimensional nature of motives. The findings show that although internal incentives remain primary, Polish firms are also strongly motivated by external factors such as the EVFTA. Moreover, the findings also reveal that the motivations vary significantly depending on firm size, industry sector, and stage of the market entry, offering valuable insights for policymakers, practitioners, and scholars interested in enhancing economic and business cooperation between Poland and Vietnam. This paper contributes to the internationalization literature by shedding light on the unique drivers shaping the expansion of Central and Eastern European firms into high-growth Southeast Asian markets.

5

Improving Public Service Culture Through Digital Transformation: A Case Study at State Administrative Agencies in Vietnam

Pham Thi Ninh

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

827--835

EN

Digital transformation is an inevitable trend of the era, profoundly impacting all aspects of social life, especially the operations of state administrative agencies. This process not only demands technological change but also requires a comprehensive transformation in mindset and working methods within the state apparatus. In this context, building and implementing public service culture becomes a key task, as public service culture is considered the "soul of the organization" and an objective measure reflecting the development of public administration, contributing to building a modern, professional, responsible, open, transparent, and efficient administration. This study focuses on analyzing the context of digital transformation and the requirements it poses for public service culture in Vietnam, assessing the current situation with prominent achievements such as building a professional working style, enhancing transparency through online public services, improving public service responsibility, and improving attitudes towards serving the public. However, the article also points out existing limitations such as uneven digital capacity, reluctance to change, violations of public service ethics, an uncoordinated legal framework, and limited implementation effectiveness. From there, the study proposes synchronized solutions to enhance the effectiveness of public service culture implementation, including strengthening propaganda, perfecting legal institutions, developing high-quality administrative human resources, and widely applying information technology in public service activities.

6

Fluoridated, low-mineralized thermal water in Phuoc Nhon area, Hoa Khuong commune, Hoa Vang district, Da Nang City, Vietnam

Nguyen Thi Hoa, To Xuan Ban

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

913--923

EN

Phuoc Nhon thermal water at Hoa Khuong commune, Hoa Vang district, Da Nang City (prior to the provincial administrative merger on 1st July 2025), Vietnam. The thermal mineral water is distributed within a fractured rock aquifer hosted in the intrusive rocks of Dai Loc Complex. Methods used in this study consist of basic field survey of hydrogeology, self-flowing water discharge tests, pumping tests, and thermal mineral water sample analysis. The thermal mineral water is classified as fluoridated, low mineralised thermal mineral water. Its exploration reserve is estimated at 425 m3 /d with good quality, satisfying all national criterials for the use of domestic supply, bathing, and medical treatments. This is one of the valuable fluoridated natural mineral water sources, which should be properly managed, exploited, protected, and utilized in a scientific, rational, and efficient manner.

7

Evaluating influence of rainfall frequency and precipitation on landslide susceptibility: A case study in Lam Dong, Vietnam

Nguyen Van Toan, Tran Dang An, Nguyen Van Hai

Inżynieria Mineralna

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2025

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Vol. 2, no. 1

469--481

EN

Landslide susceptibility involves random topographical, geological, hydrological morphology, and hydrometeorology factors. Recent decades have seen alarming landslide hazards in Vietnam. Potential geological hazards subjected to extreme rainfall have threatened Vietnam's mountainous regions. This study evaluated the influence of rainfall on landslide susceptibility in Lam Dong province using machine learning algorithms coporated with the Analytic Hierarchy Process. Crucial impact factors were considered and analyzed in different rainfall scenarios. Landslide susceptibility maps developed correspond to frequency scenarios of antecedent rainfall data. The key findings revealed that rainfall conditions significantly influenced the landslide susceptibility in Lam Dong. The probability of rainfall-induced landslides could differ depending on the watershed due to rainfall behavior differences. The higher the rainfall intensity, the greater the risk of landslides. Steep hillsides of over 20% could be highly susceptible landslides to heavy rainfall intensity or more. Soil zones with high-complex slope conditions containing a high water content ratio and high swell index subjected to extreme rainfall could have a very high risk of landslides. Fuzzy probability could be a feasible tool to define crucial landslide-prone conditions regarding rainfall and slope and model the likelihood of landslide occurrence.

8

Evaluating Drought Evolution in Vietnam Using Cmip6-Vn Climate Projections

Tran Anh Quan, Nguyen Thi Hong Ngoc, Tran Thi Thanh Thuy

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

211--229

EN

This study evaluates drought evolution across Vietnam’s seven climatic sub-regions from 1985 to 2099 using the one-month Standardized Precipitation Evapotranspiration Index (SPEI) derived from the 10-km resolution CMIP6-VN dataset. Three Shared Socioeconomic Pathways (SSP1-2.6, SSP2-4.5, SSP5- 8.5) were analyzed for near-future (2015–2039), mid-century (2040–2069), and far-future (2070–2099) periods, with potential evapotranspiration estimated via the Hargreaves-Samani method. Mann-Kendall trend tests and signal-to-noise ratio (SNR) analyses assessed drought intensity, frequency, and severity. Temperature projections indicate consistent warming, with national averages increasing by 1.4°C (SSP1- 2.6), 2.6°C (SSP2-4.5), and 4.5°C (SSP5-8.5) by century's end relative to the 1985–2014 baseline, with northern regions experiencing enhanced warming (up to 5.1°C in the Northeast) compared to southern regions (4.0°C in the Southeast). Precipitation is projected to increase across all scenarios, with SSP2-4.5 showing the largest rise (7.2% by 2070–2099), though with greater uncertainty (±20%) compared to temperature projections. Despite rising temperature and precipitation, drought tendencies vary nonlinearly due to amplified evapotranspiration outpacing precipitation gains, with northern and central regions showing prolonged drying under SSP1-2.6 early-century, while southern regions stabilize due to balanced wet-dry cycles. Drought analysis reveals dynamic hydroclimatic variability: near-term (2015– 2039) drying trends are most pronounced under SSP1-2.6 with extended moderate droughts, while midcentury (2040–2069) shifts to wetter conditions across all SSPs but most evidently in SSP1-2.6; late-century projections show modest SPEI increases with stronger wetting in northern regions under low-emission SSP1-2.6, contrasted by higher inter-model uncertainty and potential intensification in SSP5-8.5 due to amplified evapotranspiration-precipitation feedbacks. Drought intensity increases by up to 22.7% in southern Vietnam by 2015–2039 under SSP2-4.5, while frequency and severity exhibit non-monotonic trends, with notable increases in central regions (up to 15.7 months/event under SSP2-4.5). These findings underscore the need for adaptive irrigation and water management strategies to mitigate intensified drought impacts on Vietnam’s agriculture, particularly in central and northern regions.

9

Advanced Machine Learning Models for Flood Susceptibility Mapping: A Case Study in Thai Nguyen Province (Old), Vietnam

Vu Chieu Dinh, Ha Hang Thi, Luong Dung Ngoc, Bui Quynh Duy, Luu Chinh Dieu Thi, Tran Hanh Hong, Tran Xuan Truong

Inżynieria Mineralna

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2025

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Vol. 1, no. 2

903--912

EN

Floods are considered one of the most dangerous natural disasters in the world. Due to its wideranging impact, floods cause significant damage to people, property, livelihoods, habitats, infrastructure, and economic development. To date, flood susceptibility maps are still considered an effective tool in flood damage management and prevention. Thus, this study proposed the use of three advanced machine learning models, including CatBoost, LightGBM, and NGBoost, to generate flood susceptibility maps based on the historical flood locations and 11 influencing factors. The ROC-AUC results were utilized to compare and evaluate the forecasting accuracy of these ML models. The LightGBM model demonstrated superior forecast performance and was selected to build the flood susceptibility map. This map indicates that the low-lying districts and concentrated river systems in Thai Nguyen province, such as Thai Nguyen City, Song Cong, Phu Binh, Dong Hy, and Pho Yen districts, fall in high and very high flood susceptibility zones. Mountainous districts situated on the edge of Thai Nguyen province, such as Vo Nhai, Phu Luong, and Dinh Hoa, fall in medium and very low flood susceptibility zones. The obtained map provides a visual view of future flood-prone areas, assisting local authorities in land-use planning and implementing effective priority investment strategies.

10

Performance evaluation of a deep learning-enhanced software-defined receiver for IRNSS SPS signals in Vietnam

Hoang Van Hiep, Dinh Viet Ty, Pham Ngoc Hung, Ta Hai Tung, Nguyen Dinh Thuan

Artificial Satellites : Journal of Planetary Geodesy

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2025

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Vol. 60, No. 4

137--160

EN

The Indian Regional Navigation Satellite System (IRNSS), or NavIC, provides regional satellite positioning services across India and parts of Southeast Asia. In this study, we develop and evaluate a software-defined receiver (SDR) enhanced with deep learning techniques to acquire the IRNSS Standard Positioning Service (SPS) L5-band signal. The SDR architecture incorporates data-driven improvements in acquisition decision-making while retaining compatibility with the IRNSS signal structure as specified in the official ICD. Field experiments were conducted in Hanoi, Vietnam, a location situated at the fringe of NavIC’s primary service area. Signal data were collected using a low-cost RF front-end connected to a rooftop-mounted antenna. Experimental results demonstrate that the proposed SDR is capable of reliably acquiring and tracking up to four IRNSS satellites under nominal conditions. The average C/N0 ranged from 30 to 42 dB-Hz, and successful position solutions were obtained with a horizontal accuracy of approximately 25 meters. Additionally, the deep learning-based acquisition module improved robustness in low-SNR scenarios. This work represents the first implementation of a learning-aided IRNSS receiver validated in Vietnam and offers insights into extending NavIC-based positioning services to broader Southeast Asian regions.

11

Detection of surface coal mining areas from remote sensing data based on the Google Earth Engine cloud computing platform

Le Van Phu, Trinh Le Hung

Advances in Geodesy and Geoinformation

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2025

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Vol. 74, no. 2

art. no. e70, 2025

EN

Surface Coal Mining Areas (SCMAs) refer to regions affected by open-pit coal mining activities, including extraction sites and associated waste disposal zones. This study proposes the methodology for SCMA detecting in Cam Pha and Ha Long regions (Quang Ninh province, northern Vietnam) from remote sensing data based on Google Earth Engine (GEE) cloud computing platform. The remote sensing data used in this study consists of multispectral satellite images from Landsat 8 OLI_TIRS. Processing remote sensing data to detect SCMA includes the following steps: image segmentation using SNIC algorithm (Simple Non-Iterative Clustering), spectral index calculation from Landsat images, threshold-based classification, and spatial analysis to delineate extracting areas (EA) and stripped/dumping areas (SA-DA). The results indicate that Cam Pha has a larger EA (11.98 km2) and SA-DA (17.09 km2) compared to Ha Long (6.36 km2 and 3.59 km2), respectively. In contrast, Ha Long exhibits a higher EA/SA-DA ratio (1.77), suggesting more land reclamation, while Cam Pha has extensive mining waste accumulation (0.70). These findings highlight the severe environmental degradation caused by coal mining, emphasizing the need for sustainable land management. The SCMA detection approach in GEE provides an efficient, scalable method for real-time monitoring, long-term change detection, and environmental restoration planning in mining regions.

12

Improving the Effectiveness of Interregional Connectivity for Sustainable Development in Vietnam

Nguyen Duc Quyen, Tora Barbara

Inżynieria Mineralna

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2024

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Vol. 3, no. 2

art. no. 16

EN

Interregional connectivity is a decisive factor in the formation of planning regions and the links and cooperation in the development of economic sectors, creating a driving force for the growth and development of the region. It reflects both an essential and mandatory need for cooperation and international integration in the context of globalization for regions and countries. In Vietnam, promoting interregional connectivity has always been one of the top priorities in our country’s socio-economic development in recent times. This important content is mentioned in the documents of the 13th National Congress of the Communist Party as well as in the Mediumterm Economic Development Plan 2021–2025 and the Socio-Economic Development Strategy 2021–2030. Interregional connectivity aims to leverage comparative advantages, create competitive advantages, and drive regional development through the connection of economic, natural, cultural, and social spaces among localities within the region. This is one of the essential requirements currently, especially in the context of building an effective and efficient governance system. Within the framework of this study, the author focuses on several basic issues related to enhancing the effectiveness of interregional connectivity in Vietnam, including: (1) Overview of the related research; (2) Approaches and theories of interregional connectivity research; (3) The necessity of enhancing the effectiveness of interregional connectivity; (4) The current state of interregional connectivity in Vietnam; (5) Solutions to enhance the effectiveness of interregional connectivity.

PL

Łączność międzyregionalna jest decydującym czynnikiem w kształtowaniu regionów planistycznych oraz powiązań i współpracy w rozwoju sektorów gospodarczych, tworząc siłę napędową wzrostu i rozwoju regionu. Odzwierciedla zarówno niezbędną, jak i obowiązkową potrzebę współpracy i integracji międzynarodowej w kontekście globalizacji dla regionów i krajów. W Wietnamie promowanie łączności międzyregionalnej zawsze było jednym z najważniejszych priorytetów w rozwoju społeczno-gospodarczym naszego kraju w ostatnich czasach. Ta ważna treść jest wspomniana w dokumentach XIII Krajowego Kongresu Komunistycznej Partii Wietnamu, a także w Średnioterminowym Planie Rozwoju Gospodarczego na lata 2021–2025 oraz Strategii Rozwoju SpołecznoGospodarczego na lata 2021–2030. Łączność międzyregionalna ma na celu wykorzystanie przewag komparatywnych, stworzenie przewag konkurencyjnych i napędzanie rozwoju regionalnego poprzez połączenie przestrzeni gospodarczych, naturalnych, kulturowych i społecznych między lokalizacjami w regionie. Jest to jedno z niezbędnych wymagań obecnie, zwłaszcza w kontekście budowy skutecznego i efektywnego systemu zarządzania. W ramach tego badania autor koncentruje się na kilku podstawowych kwestiach związanych z poprawą efektywności łączności międzyregionalnej w Wietnamie, w tym: (1) Przegląd badań związanych z tematem; (2) Podejścia i teorie badań nad łącznością międzyregionalną; (3) Konieczność poprawy efektywności łączności międzyregionalnej; (4) Aktualny stan łączności międzyregionalnej w Wietnamie; (5) Rozwiązania mające na celu poprawę efektywności łączności międzyregionalnej.

13

Assessing groundwater status of utilization in the coastal area of Soc Trang Province, Vietnam

Nguyen Vo Chau Ngan, Huynh Vuong Thu Minh, Nguyen Cong Thuan, Nhu Y Bui

Environment Protection Engineering

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2024

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Vol. 50, nr 4

29--45

EN

The research was conducted on groundwater exploitation and usage in Ward 2, Vinh Chau Town, Soc Trang Province. A total of 405 households were interviewed about enduse water status. Groundwater samples from 9 wells were monitored once for water quality status. The results of the study indicated that there was a total of 520 wells installed at 405 households showing that water is urgently needed for domestic use (88.7%), and agricultural use (69.5%). There were 41.4% of the wells drilled since 2010 up to now and 74.3% of the wells drilled over 100 m. To get more water, particularly in dry seasons, the farmers applied large intake pipes (96.4% of the well’s pipe diameters were 49 and 60 mm) and illegally pumped (syringes pump, air pump, or rocket pump) which led to a decrease in groundwater levels and caused pressure on water source. Groundwater quality is within threshold values of national technical standards. Appropriate pumping technique was a suggestion to the farmers. Local authorities need to pay more attention to groundwater management in this area that help farmers use this resource.

14

A study on time schedules for construction projects in Hanoi, Vietnam

Hai Dinh Tuan

Archives of Civil Engineering

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2024

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Vol. 70, nr 1

667--691

EN

With its position as the capital, Hanoi is the political center as well as the second largest economic center of the country. Therefore, the city is always allocated a large budget in construction investment to create material facilities for political tasks and economic and social development. During the implementation of construction projects, a number of difficulties and limitations have appeared. In which, projects are delayed in construction and disbursement, reducing investment efficiency and not meeting the expectations of the government and people. From this fact, the authors have conducted a study to evaluate the causes affecting the time schedule of construction projects in Hanoi. The method F-APH (Fuzzy Analytic Hierarchy Process) was used to analyze data objectively and accurately about the causes affecting the time schedule. From there, these causes are classified into groups of subjective causes (from within the project) and groups of objective causes (from outside the project). The results show that subjective causes, originating from project participants, have a stronger influence than objective causes. A number of specific proposals to the actors involved in construction projects are made to eliminate or limit the impact of the causes of construction progress.

15

Status and prospects of fully mechanized mining technology in Vietnam coal mines from 2005 to 2020

Duc Hai Duong, Hong Quang Dao, Van Viet Phan, Van Thang Ngo

Journal of Sustainable Mining

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2023

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Vol. 22. iss. 2

147--154

EN

This paper analyzes the achievement and the failures of applying the mechanized mining method in underground coal mines by the Vietnam National Coal e Mineral Industries Holding Corporation Ltd. (VINACOMIN) for 15 years (from 2005 to 2020). It also proposes the recommendations for developing mechanized mining in order to improve coal production, productivity and safety management for the sustainable development of Vietnam's underground coal mining in the period 2021-2025.

16

Radon-Radium Thermal Mineral Water in Vo Am Ecotourism Project Area, Ngoc Luong Commune, Yen Thuy District, Hoa Binh Province, Vietnam

Ban To Xuan, Dung Le Tien, Duc Tran Van, Trong Nguyen Huu, Tuan Truong Duc

Inżynieria Mineralna

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2023

|

no. 2, vol. 1

327--333

EN

Ngoc Luong thermal mineral water at Vo Am ecotoursim, Ngoc Luong commnune, Yen Thuy district, Hoa Binh province, northern Vietnam. The thermal mineral water source is at karstic-fractured limstones of Dong Giao Formation aged Anisi. Methods used in this study conists of basic field survey of hydrogeology, resistivity, borehole drilling, pumping tests, and thermal mineral water sample analysis. The thermal mineral water is classified as radon-radium, low mineralised thermal mineral water. The water source is originally related to the deep Moc Chau-Tam Diep Fault directing northwest-southeastward. Its exploration reserve is estimated at 1,497 m3/d with good quality, sastifying all national criterals for the use of domestic supply, bathing, and medical treatment. This is one of ten rare thermal-mineral water sources in Vietnam, containing radon and radium. It is thefore necessary to have good management to ensure the thermal-mineral water to be effectively exploited, used, and protected.

17

Geological and Geochemical Characteristics of the Pac Lang Gold Deposits, Northeastern Vietnam and Their Potential Prospects

Khuong The Hung, Nguyen Van Dat, Nguyen Thi Cuc, Pham Nhu Sang

Inżynieria Mineralna

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2023

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no. 2, vol. 1

311--318

EN

The Song Hien Rift basin, located in northeast Vietnam, has been identified as an important region for gold deposits, including the Pac Lang deposit. Several methods like petrographic observations, elemental analyses, and geochemical elements and vertical zoning models of primary halo have been used to describe geological characteristic of this deposit. The investigation focused on examining the geological events that occurred both before and after the formation of the ore. The use of ICP-MS analysis and element concentration contrast enabled an effective assessment of the relative degrees of denudation that occurred at the Pac Lang deposit. The findings of this study were consistent with prior research on ore deposit geology, geochemical primary-halo, and examination of geochemical indicator zoning patterns for gold ore bodies. The study's application of singularity analysis for evaluating the degree of denudation provides important geological information that can aid in data interpretation. The results of the study can also have significant reference value in furthering our understanding of the post-ore deformation of deposits and in the investigation of unknown orebodies in northeast Vietnam. There indicate that, the research's findings suggest that the use of singularity analysis to evaluate the degree of denudation is a valuable tool for exploring potential gold deposits and enhancing our knowledge of gold deposit geology in northeast Vietnam. Overall, this study contributes to the existing body of knowledge on gold deposits in the Song Hien Rift basin and can serve as a useful reference for future research in the area.

18

Developing Criteria for Assessing The Stability of Water Supply Models in High Mountains and Water-Scare Areas

Nguyen Manh Truong, Dinh Anh Tuan, Nguyen Tiep Tan, Vu Thi Hong Nghia, Do Van Binh

Inżynieria Mineralna

|

2023

|

no. 2, vol. 1

179--186

EN

The article presents the scientific basis for assessing the stability of water supply models and develops a suitable set of criteria to assess the stability of water supply works, which includes the water supply part for water supply works and systems (including headworks and water distribution systems) in high mountains and water-scarce areas in Vietnam. Research results indicate that in order to improve the stability and availability of water of the models that have been, are and will be built, it is necessary to have a common method of evaluating effectiveness for scientific models of domestic water supply. Accordingly, it is necessary to build obtain a suitable set of criteria to assess the stability of the water supply model (source + water supply works) in the high mountains, water-scarce areas in Vietnam.

19

Temporal and spatial heterogeneity of the Ailaoshan–Song Ma–Song Chay ophiolitic mélange, and its significance on the evolution of Paleo-Tethys

Lin Wei, Liu Fei, Wang Ying, Meng Lingtong, Faure Michel, Chu Yang, Nguyen Vuong Van, Wu Qinying, We Wei, Thu Hoai Luong Thi, Vu Tich Van

Geotourism / Geoturystyka

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2023

|

nr 1-2 (72-73)

42--43

EN

The ophiolite is the direct evidence to restore the oceanic evolution, and it is used to identify the convergence boundary of the plates. Compared with ophiolite, ophiolitic mélange, especially its matrix, contains more information about the evolution of ocean. The evolution of eastern Paleo-Tethys, between the South China and Indochina blocks, recorded the whole process of rifting from Gondwana and their northward migration and convergence. To understand the tectonic implications from matrix of ophiolitic mélange, the Mesozoic Paleo-Tethys Ailaoshan–Song Ma–Song Chay suture zone located in the North Vietnam–Southeast Yunnan region acts as an ideal study area. Based on the structural geology, we reviewed previous zircon U-Pb dating and Lu-Hf isotopic analyses on the detrital zircon from the Ailaoshan–Song Ma–Song Chay ophiolitic mélange. Accordingly, we subdivide the matrix of these ophiolitic mélange into four parts (M1, M2, M3, and M4; Fig. 1). M1 is mainly located in the middle segment of the Ailaoshan–Song Ma belt. It shows age peaks of 440 Ma and 960 Ma with εHf(t) values of −19.6 ~ +10.3. M2 is mainly located in the NW segment of the Ailaoshan–Song Ma belt, showing a dominant age peak of ~260 Ma. Particularly, it has εHf(t) values of −28.9 ~ +8.1. M3 is mainly located in the SE segment of the Ailaoshan–Song Ma belt, showing the peaks at ~250 Ma, 440 Ma, and 960 Ma with εHf(t) values of −21.9 ~ +10.1. M4 is mainly located in the Song Chay belt, showing the peaks at ~310 Ma, 470 Ma, 610 Ma, 770 Ma, and 965 Ma with εHf(t) values of −28.2 ~ +10.8. The geochronological data of the detrital zircon from the matrix of the Ailaoshan– Song Ma–Song Chay ophiolitic mélange zone, documents a temporal heterogeneity between the M1, M2, M3, and M4 units, which formed at 310–270 Ma, 265–250 Ma, 245–240 Ma, and 310–255 Ma, respectively. The different components and provenances of each unit reflect a strike-parallel heterogeneity (Fig. 1). The M1 unit was mainly sourced from the Paleozoic sedimentary rocks of the Indochina Block (IB). The main provenance for the M2 unit is Emeishan Large Igneous Province (ELIP). The magmatic arc developed in the IB provided the materials for the M3 unit, and the detrital materials of the M4 were mainly sourced from the South China Block (SCB) (Fig. 1). The Cenozoic strike-slip deformation led to an inverted geometry of the M1, M2, and M3 units, accounting for a strike-perpendicular heterogeneity straight to the strike of the orogenic belt. The temporal, strike-parallel, and strike-perpendicular heterogeneity help us to decipher the tempo-spatial evolution of the Paleo-Tethys. The M1, M2, M3, and M4 units contain information from different evolutionary stages, likely recording the comprehensive history of the ancient oceanic basin. Importantly, our results demonstrate that both the active continental margin of the IB and the passive continental margin of the SCB acted as provenance sources that supplied significant amount of detrital material in the ophiolitic mélange matrix, indicating that the Paleo-Tethys Ocean was a “narrow” or “limited” ocean rather than the archipelagic ocean proposed before.

20

Decoupling Analysis, Economic Structure on Environmental Pressure in Vietnam During 2008–2018

Huong Ta Thi

Ecological Engineering & Environmental Technology

|

2023

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Vol. 24, iss. 9

191--203

EN

In this research, we display the trajectories of Vietnam’s environmental pressure throughout the years during 2008–2018 and identify the underlying socioeconomic driving factors through input-output and forward-backward linkage analysis. Decoupling index (DI) and input-output analysis (IOA) indicated that mining, the extraction, and use of fossil fuels, as well as energy generation for daily life and manufacturing industries, are the primary contributors to rising environmental pressures (DI; forward and backward linkage values > 1). Vietnam’s decoupling performance has four distinct phases. Mineral and fossil fuel depletion; climate change in the short-term and long-term, and water stress indexes (the ratio of total annual freshwater withdrawal to hydrological availability) were high with 456.91%; 55.91%; 54.43%; 41.87%; and 30%, respectively during 2008–2018.