Holocene sedimentary facies in the incised valley of Ma River Delta, Vietnam

Quang Nguyen Minh; Ha Vu Van; Min Nguyen Thi; Dao Ngo Thi; Cuc Nguyen Thi Thu; Tuan Dang Minh; Tung Dang Xuan; Man Tran Thi; Thao Nguyen Thi

doi:10.15625/2615-9783/18923

Author affiliations

Authors

Nguyen Minh Quang 1-Institute of Geological Sciences, VAST, Vietnam; 2-Graduate University of Science and Technology, VAST, Vietnam
Vu Van Ha 1-Institute of Geological Sciences, VAST, Vietnam; 2-Graduate University of Science and Technology, VAST, Vietnam
Nguyen Thi Min Institute of Geological Sciences, VAST, Vietnam
Ngo Thi Dao Institute of Geological Sciences, VAST, Vietnam
Nguyen Thi Thu Cuc Hanoi University of Sciences, VNU
Dang Minh Tuan Institute of Geological Sciences, VAST, Vietnam
Dang Xuan Tung Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Thi Man Institute of Geological Sciences, VAST, Vietnam
Nguyen Thi Thao 1-Graduate University of Science and Technology, VAST, Vietnam; 2-Institute of Geography, VAST, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/18923

Keywords:

Holocene sedimentary facies, ancient environments, sea level change, the coastal Thanh Hoa area

Abstract

Holocene sediment facies in the incised valley of the Ma River Delta were clarified by using analysis of LKTH6 core (32 m depth) such as sedimentary structure analysis, grain-sized, micro-paleontological (foraminifera, spore and pollen, and diatom), clay minerals characteristics, and Radiocarbon dating (¹⁴C). Ten sedimentary facies were identified, including (1) flood plain silty clay facies, (2) Salt marsh clayey silt facies, (3) Tidal flat sandy silty clay facies, (4) Tidal creek and tidal branch silty clayey sand facies, (5) Bay silty clay facies, (6) Prodelta silty clay facies, (7) Delta front silty sand facies, (8) Mouth bar sand facies, (9) Point bar silty sand faces, and (10) Alluvial plain silty clay facies.

The sea level change after the last glacial was recorded by sediment facies and radiocarbon dating (¹⁴C). It showed that before 9380 yr. BP, the transgression concurrent with the base-level rising resulted in the incised valley filled up by fluvial sediment. The transgression drowned incised valley was recorded by the initial marine flooding surface which was identified by salt marsh sedimentary facies in the valley at 9380 yr. BP, and the drowning process of the incised valley completely around 8000 yr. BP. After 8000 yr. BP, the sedimentary accumulation exceeded the sea level rise rate resulting in the delta being formed.

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