Sediment discharge and storage over the last deglacial highstand period on the central Vietnam shelf off Nha Trang

• Autorzy: Dung Bui Viet , Stattegger Karl , Kieu Nguyen Van , Thanh Nguyen Trung , Thong Bui Xuan , Vu Pham Nguyen Ha , Man Ha Quang , Trang Pham Hong

Identyfikatory

DOI

10.7306/gq.1475

• Języki publikacji: EN

Abstrakty

EN

A sediment budget for the central Vietnam shelf off Nha Trang over the last deglacial Holocene highstand period has been investigated on the basis of shallow seismic and sediment core data and empirical equations. The annual suspended sediment discharge to the Nha Trang shelf ranges from: 4.3 to 5.4 Mt/year. Estimates based on published empirical equations suggest that the sediment discharge by three main local mountainous rivers (the Cai, Dinh and Van Phong rivers) that enter the Nha Trang shelf ranges between 1.7 and 4 Mt/year, which implies that the local rivers discharge approximately 75% of the total annual sediment input to the shelf. The annual sediment supply of the Cai River is approximately 2 and 6 times higher than that of the Dinh and Van Phong rivers, respectively. The highstand sediment depocentre of the Nha Trang shelf is mostly attached to the local river outflows, indicating their importance as the principal sediment supply sources to the shelf. Additional sources of sediment supply to the Nha Trang shelf can probably be related to along-shore transport from the nearby shelves. Calculations based on seismic and sediment core data indicate that the net sediment volume storage on the Nha Trang shelf is approximately 2.15 Mt/year. Approximately 50% of the total sediment yield supplied to the shelf is probably transported along-shore to the south. The sediment budget model for highstand deposits on the Nha Trang shelf is typical for a small mountainous river basin, which is significantly different from that of the large river delta systems in Vietnam such as the Mekong and Red rivers where 90% of the river sediments are captured on the delta plain/subaqueous part and only 10% of the river sediments are transported to the nearby shelf. In contrast, most of the sediments supplied by small mountainous rivers off Nha Trang are transported to the mid-shelf, forming a shore-parallel mud depocentre.

Słowa kluczowe

EN

sediment budget; Nha Trang shelf; central Vietnam; Holocene highstand; sequence stratigraphy

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2019
• Tom: Vol. 63, No. 2
• Strony: 395--406
• Opis fizyczny: Bibliogr. 36 poz., fot., mapa, rys., tab., wykr.

Twórcy

autor

Dung Bui Viet

• Vietnam PetroIeum Institute, Petrovietnam, 173 Trung Kinh, Hanoi, Vietnam

autor

Stattegger Karl

• Kiel University, Institute of Geosciences, D-24118 Kiel, Germany
• Adam Mickiewicz University, ul. Wieniawskiego 1, 61-712 Poznań, Poland

autor

Kieu Nguyen Van

• Vietnam Petroleum Institute, Petrovietnam, 173 Trung Kinh, Hanoi, Vietnam
• AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Thanh Nguyen Trung

• Vietnam Academy of Science and Technology, Institute for Marine Geology and Geophysics, 18 Hoang Quoc Viet, Hanoi, Vietnam

autor

Thong Bui Xuan

• Institute of Oceanography and Environment, 132 Nguyen Khuyen, Van Mieu, Dong Da, Hanoi, Vietnam

autor

Vu Pham Nguyen Ha

• University of Science, Hanoi National University, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam

autor

Man Ha Quang

• Petrovietnam Exploration Production Corporation, 117 Tran Duy Hung, Cau Giay, Hanoi, Vietnam

autor

Trang Pham Hong

• School of Civil Engineering, Asian Institute of Technology, P. O. Box 4, Klong Luang, Pathuthani 12120, Thailand

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).