Geochemical records of Taiwan-sourced sediments in the South China Sea linked to Holocene climate changes

Online Access: Get full text
doi: 10.1016/j.palaeo.2015.10.036
Author(s): Huang Jie; Wan Shiming; Xiong Zhifang; Zhao Debo; Liu Xiting; Li Anchun; Li Tiegang
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Institute of Oceanology, Laboratory of Marine Geology and Environment, Qingdao, China
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 441( Part 4), p.871-881. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 88 refs.; illus., incl. 3 tables, sketch map
Summary: We present a multi-proxy geochemical analysis of core KNG5 retrieved from the northern South China Sea slope spanning the last 13.0 ka BP to assess the response of weathering and erosion processes in the Southwestern Taiwan River basin to climate change. A provenance analysis indicates that the core sediments were primarily derived from the Southwestern Taiwan River, and can be used to reconstruct the erosion and/or weathering history of this river basin. The chemical index of alteration, the plagioclase index of alteration, Rb/Sr, Al/Ti, principle component 1, and K/Al combined with terrigenous mass accumulation rates and the proportion of clay exhibit sharp excursions from 12.0 to 5.5 ka, peaking at 10.0 ka, which suggests strong chemical weathering and physical erosion during the Early-Mid Holocene, the period of the maximum summer monsoon. Abrupt falling weathering trends during 5.2 and 3.5 ka BP correlate with a weaker monsoon. After 3.5 ka BP, a stable lower weathering trend to the present day was evident, indicating the deposition of less weathered sediments in the slope when the monsoon rainfall was weakening. A good correlation between our proxy records of chemical weathering and variations of the monsoon intensity in South China emphasizes that variation in monsoon intensity is most likely the primary drive of the intensity of weathering and erosion in Southwestern Taiwan River sediments over the last 13.0 ka BP. Finally, we concluded that geochemical parameters can be used as reliable proxies for climate variation on a millennial-centennial time scale in such areas as Taiwan, where weathering-limited regimes exist. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Absolute age; Alteration; Asia; C-13/C-12; C-14; Carbon; Cenozoic; Chemical weathering; China; Clay mineralogy; Climate; Climate change; Climatic controls; Cores; Dates; Depth; Drainage basins; Erosion; Far East; Feldspar group; Foraminifera; Framework silicates; Guangdong China; Holocene; Intensity; Invertebrata; Isotope ratios; Isotopes; Leg 184; Lower Holocene; Luzon; Major elements; Marine sediments; Metals; Middle Holocene; Monsoons; North Pacific; Northern Luzon; Northwest Pacific; ODP Site 1144; ODP Site 1146; Ocean Drilling Program; Pacific Ocean; Paleoclimatology; Philippine Islands; Plagioclase; Planktonic taxa; Pleistocene; Protista; Provenance; Quaternary; Radioactive isotopes; Rare earths; Sedimentation; Sedimentation rates; Sedimentology; Sediments; Silicates; South China Sea; Southwestern Taiwan; Southwestern Taiwan Basin; Stable isotopes; Taiwan; Terrigenous materials; Trace elements; Upper Pleistocene; Weathering; West Pacific; Zhujiang River
Coordinates: N192724 N192724 E1161622 E1161622
N200311 N200311 E1172508 E1172508
N195510 N195510 E1150832 E1150832
Record ID: 2016016341
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands