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
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
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