Journal of GEOLOGY, Series B, No.47-48/2018.
Unit 5: Paleoclimate change during the Neogene period in Vietnam: Sedimentological evidences from the Hoành Bồ basin (Quảng Ninh province, Northeastern Vietnam)
Hoàng Văn Thà1, Wysocka Anna2, Lê Thị Nghinh1, Ziółkowski Piotr2,
Nguyễn Quốc Cường1, Phan Đông Pha3, Nguyễn Minh Quảng1
1 Institute of Geological Sciences, Viet Nam Academy of Sciences and Technology;
2 Faculty of Geology, University of Warsaw;
3Institute of Marine Geology and Geophysics, Viet Nam Academy of Sciences and Technology
Corresponding author: thahoangvan@gmail.com
Received: 13/6/2018
Accepted: 25/8/2018
Abstract: The Hoành Bồ Basin is filled with Neogene continental sediments which were subdivided into the Dong Ho, Tieu Giao and undivided Quaternary formations. The Dong Ho formation, two main sedimentary systems were recognized, namely alluvial and lacustrine with the main amount of lacustrine sediments, while there are also 2 main sedimentary systems, namely alluvial and fluvial with the main amount of fluvial sediments in the Tieu Giao Formation. Keeping track of the bottom formation of the basin and comparing characteristics of materials, the change of plant world from the lowest strata to the upper one in vertical profile during the Neogene period represents that the evolution of Neogene climate is the gradual transmutation from semi-dry and hot, even dry and hot into wet tropical condition.
Keywords: Hoành Bồ basin, Neogene, paleoclimate