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Large-scale erosional response of SE Asia to monsoon evolution reconstructed from sedimentary records of the Song Hong-Yinggehai and Qiongdongnan basins, South China Sea

By
Long Van Hoang
Long Van Hoang
1
Department of Geology & Petroleum Geology, School of Physical Sciences
,
University of Aberdeen
,
Meston Building, Aberdeen AB24 3UE
,
UK
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Peter D. Clift
Peter D. Clift
1
Department of Geology & Petroleum Geology, School of Physical Sciences
,
University of Aberdeen
,
Meston Building, Aberdeen AB24 3UE
,
UK
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Anne M. Schwab
Anne M. Schwab
2
Marathon International Petroleum (GB) Ltd
,
Marathon House, Rubislaw Hill, Anderson Drive, Aberdeen AB15 6FZ
,
UK
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Mads Huuse
Mads Huuse
1
Department of Geology & Petroleum Geology, School of Physical Sciences
,
University of Aberdeen
,
Meston Building, Aberdeen AB24 3UE
,
UK
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Duc Anh Nguyen
Duc Anh Nguyen
3
Vietnam Petroleum Institute
,
Yen Hoa, Cau Giay, Hanoi
,
Vietnam
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Sun Zhen
Sun Zhen
4
South China Sea Institute of Oceanography
,
Chinese Academy of Sciences
,
164 Xingang Road, Guangzhou, 510301
China
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Published:
January 01, 2010

Abstract

The Song Hong-Yinggehai (SH-Y) and Qiongdongnan (Qi) basins together form one of the largest Cenozoic sedimentary basins in SE Asia. Here we present new records based on the analysis of seismic data, which we compare to geochemical data derived from cores from Ocean Drilling Program (ODP) Site 1148 in order to derive proxies for continental weathering and thus constrain summer monsoon intensity.

The SH-Y Basin started opening during the Late Paleocene–Eocene. Two inversion phases are recognized to have occurred at c. 34 Ma and c. 15 Ma. The Qi Basin developed on the northern, rifted margin of South China Sea, within which a large canyon developed in a NE–SW direction.

Geochemical and mineralogical data show that chemical weathering has gradually decreased in SE Asia after c. 25 Ma, whereas physical erosion became stronger, especially after c. 12 Ma. Summer monsoon intensification drove periods of faster erosion after 3–4 Ma and from 10–15 Ma, although the initial pulse of eroded sediment at 29.5–21 Ma was probably triggered by tectonic uplift because this precedes monsoon intensification at c. 22 Ma. Clay mineralogy indicates more physical erosion together with high sedimentation rates after c. 12 Ma suggesting a period of strong summer monsoon in the Mid-Miocene.

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Contents

Geological Society, London, Special Publications

Monsoon Evolution and Tectonic–Climate Linkage in Asia

P. D. Clift
P. D. Clift
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R. Tada
R. Tada
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H. Zheng
H. Zheng
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Geological Society of London
Volume
342
ISBN electronic:
9781862395909
Publication date:
January 01, 2010

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