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Wpływ wilgotności gruntów mineralnych na wartość efektywnej przewodności termicznej na podstawie wyników pomiarów laboratoryjnych

Łukawska Aleksandra, Żeruń Mateusz, Ryżyński Grzegorz

Przegląd Geologiczny

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2021

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Vol. 69, nr 9

604--610

EN

The article presents the results of laboratory tests of thermal conductivity of mineral soils. Measurements were performed on the basis of the previously developed methodology. Knowledge of values of the thermal conductivity coefficient of soil is essential for the design of installations that use thermal properties of subsoil for energetic purposes. The results of the measurements are stored in the rock and soil thermal properties database, in which additional physical parameters of soils are collected as well. Based on the information from the database, the authors presented the relationship between soil moisture (non-cohesive soils), the liquidity index (cohesive soils), and their thermal conductivity.

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Problematyka oznaczania i opisu gruntów według Eurokodu 7

Majer Edyta, Roguski Adam, Łukawska Aleksandra, Grabowska Alicja

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

949--953

EN

The paper analyses the implementation of European standards: PN-EN ISO 14688:2018 Geotechnical investigation and testing - Identification and classification of soil - Part 1: Identification and description and Part 2: Principles for a classification (hereinafter ISO) in Polish geotechnical practice. Although PN-EN ISO 14688 standards have been a part of the Polish standards scope since 2006, daily practice shows that their proper understanding and use still causes a lot of problems. On the basis of daily experience from reading archival geological and engineering reports and studies, the authors were able to indicate the most common issues in attempts to identify and describe soils according to the aforementioned ISO standards.

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Oznaczanie, opis i klasyfikacja gruntów według norm PN-EN ISO 14688-1 oraz 14688-2

Majer Edyta, Roguski Adam, Grabowska Alicja, Łukawska Aleksandra

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

937--948

EN

The article introduces the methods of identification, description and classification of soils presented in the PN-ENISO14688-1 and PN-EN ISO 14688-2 standards. Experience shows that these standards, although referred to by Eurocode 7, are still not fully implemented and are most often applied incorrectly. In practice, the soil is still identified macroscopically using the principles presented in the with drawn PN-B-02480:1986, PN-B-02481:1998 and PN-B-04481:1988 standards.

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Oznaczanie i opis gruntów drobnoziarnistych zgodnie z PN-EN ISO 14688-1:2018-05

Majer Edyta, Roguski Adam, Grabowska Alicja, Łukawska Aleksandra

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

927--935

EN

The principles of identification and description of soil presented in the PN-EN ISO 14688-1:2018-05 standard are clear and easy to apply. The most important step in the identification process is the determination of the primary fraction in terms of plastic behaviour. The standard provides 8 tests to distinguish between silt and silt and clay as primary fractions determining the geological and engineering properties of soil.

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U-Pb zircon geochronology of high-grade charnockites - exploration of pre-Mesoproterozoic crust in the Mazury Complex area

Krzemińska Ewa, Łukawska Aleksandra, Bagiński Bogusław

Acta Geologica Polonica

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2019

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Vol. 69, no. 4

489--511

EN

Charnockites – i.e., orthopyroxene-bearing felsic rocks – were formed in a deep-seated dry environment, either under plutonic or high-grade metamorphic conditions. Most charnockites known from the crystalline basement of Poland appear to be of Mesoproterozoic age (1.50–1.54 Ga), cogenetic with the Suwałki Anorthosite Massif, and associated with mangerite and granite members forming the AMCG suite of the Mazury Complex. Genetically distinct rocks, characterised by the presence of anhydrous minerals, e.g., orthopyroxene and garnet, were also recognised along 592 m of the Łanowicze PIG-1 borehole section, within the AMCG suite. U-Pb geochronology by sensitive high resolution ion microprobe (SHRIMP) was used to date the complexly zoned zircons. The ages of crystallisation of the charnockite protoliths from various depths at 1837 ± 7, 1850 ± 9, 1842 ± 6, and 1881 ± 16 Ma makes these rocks the oldest dated crust within this part of the Polish basement. The Łanowicze PIG-1 borehole section bears components from neighbouring tectonic domains known from Lithuania: the West and Middle Lithuanian (WL/MLD) domains considered as a continental margin at 1.84–1.86 Ga and the fragmented Latvia-East Lithuania (LEL) domain, where the oldest continental crust was generated at c. 1.89–1.87 Ga. The metamorphic zircon overgrowths document a high-grade event at 1.79 Ga and then constrained at 1.5 Ga. Dating of pre-Mesoproterozoic crust cryptic within the AMCG Mazury Complex provides valuable information on the nature of the pre-existing blocks formed during the long lasting Svecofennian orogeny.