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

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doi: 10.1144/SP342.13
Author(s): Long Van Hoang; Clift, Peter D.; Schwab, Anne M.; Huuse, Mads; Duc Anh Nguyen; Zhen Sun
Author Affiliation(s): Primary:
University of Aberdeen, Department of Geology and Petroleum Geology, Aberdeen, United Kingdom
Other:
University of Tokyo, Japan
University of Nanjing, China
Marathon International Petroleum, United Kingdom
Vietnam Petroleum Institute, Vietnam
Chinese Academy of Sciences, South China Sea Institute of Oceanography, China
Volume Title: Monsoon evolution and tectonic-climate linkage in Asia
Volume Author(s): Clift, Peter D., editor; Tada, R.; Zheng, H.
Source: Monsoon evolution and tectonic-climate linkage in Asia, edited by Peter D. Clift, R. Tada and H. Zheng. Geological Society Special Publications, Vol.342, p.219-244. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 99 refs.; illus., incl. sects., 1 table, geol. sketch maps
Summary: 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.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 23 Surficial Geology, Geomorphology; Asia; Basins; Bedload; Cenozoic; Chemical weathering; China; Clay minerals; Climate change; Cores; Cross sections; East Asian monsoon; Erosion; Erosion rates; Far East; Hainan China; Leg 184; Monsoons; North Pacific; Northwest Pacific; ODP Site 1148; Ocean Drilling Program; Pacific Ocean; Paleoclimatology; Qiongdongnan Basin; Reconstruction; Sedimentary basins; Sedimentation rates; Seismic stratigraphy; Sheet silicates; Silicates; South China Sea; Southeast Asia; Tectonics; Temporal distribution; Tertiary; Uplifts; Weathering; West Pacific; Yinggehai Basin
Coordinates: N160000 N220000 E1110000 E1053000
Record ID: 2011002471
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom