Development of the East Asian summer monsoon; evidence from the sediment record in the South China Sea since 8.5 Ma

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doi: 10.1016/j.palaeo.2006.06.013
Author(s): Wan Shiming; Li Anchun; Clift, Peter D.; Jiang Hengyi
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Institute of Oceanology, Qingdao, China
University of Tokyo, Japan
Tongji University, China
University of Aberdeen, United Kingdom
Volume Title: Monsoon and tectonics of Asia; selected papers from the symposium "IGCP 476, monsoon and tectonics"
Volume Author(s): Clift, Peter D., editor; Tada, Ryuji; Zheng Hongbo
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 241(1), p.139-159; Symposium "IGCP 476, monsoon and tectonics", Shanghai, China, July, 2004, edited by Peter D. Clift, Ryuji Tada and Zheng Hongbo. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. Includes 2 appendices. 120 refs.; illus., incl. sketch map
Summary: 128 samples from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea were analyzed for grain size, clay minerals, biogenic opal content and quartz in order to reconstruct changes in East Asian monsoon climate since 8.5 Ma. An abrupt change of terrigenous mass accumulation rate (MAR), clay mineral assemblage, median grain size and biogenic opal MAR about 5.2 Ma suggests that between 8.5-5.2 Ma the source of terrigenous sediment was mainly in the region of surface uplift and basaltic volcanism in southern Vietnam. A simple model of East Asian summer monsoon evolution was based on the clay/feldspar ratio, kaolinite/chlorite ratio and biogenic opal MAR. The summer monsoon has two periods of maximum strength at 8.5-7.6 Ma and 7.1-6.2 Ma. Subsequently, there was a relatively stable period at 6.2-3.5 Ma, continued intensification about 3.5-2.5 Ma, and gradually weakening after 2.5 Ma. Since 1 Ma the monsoon has intensified, with remarkable high-frequency and amplitude variability. Simultaneous increase in sedimentation rates at ODP Sites 1143, 1146 and 1148, as well as in MAR of terrigenous materials, quartz, feldspar and clay minerals at ODP Site 1143 at 3.5-2.5 Ma, may be the erosional response to both global climatic deterioration and the strengthening of the East Asian summer monsoon after about 3-4 Ma. Abstract Copyright (2006) Elsevier, B.V.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Cenozoic; China; Clay minerals; Climate change; Cores; Far East; Framework silicates; IGCP; Leg 184; Marine sediments; Mineral assemblages; Mineral composition; Miocene; Monsoons; Neogene; North Pacific; Northwest Pacific; ODP Site 1143; ODP Site 1145; ODP Site 1146; ODP Site 1148; Ocean Drilling Program; Opal; Pacific Ocean; Paleoclimatology; Provenance; Quartz; Reconstruction; Sediments; Sheet silicates; Silica minerals; Silicates; South China Sea; Tertiary; Tibetan Plateau; West Pacific
Coordinates: N192724 N192724 E1161622 E1161622
N193502 N193502 E1173752 E1173752
N185010 N185010 E1163356 E1163356
N092143 N092143 E1131707 E1131707
Record ID: 2007038813
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands