Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid-Pleistocene SCIE SCOPUS

Cited 5 time in WEB OF SCIENCE Cited 5 time in Scopus
Title
Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid-Pleistocene
Author(s)
Chen, Hongjin; Xu, Zhaokai; Lim, Dhongil; Clift, Peter D.; Chang, Fengming; Li, Tiegang; Cai, Mingjiang; Wang, Wei; Yu, Zhaojie; Sun, Rongtao
KIOST Author(s)
Lim, Dhong Il(임동일)
Publication Year
2020-04
Abstract
We present a multiproxy record of Sr-Nd isotopes and major and trace elements for clay-sized (<2 mu m) siliciclastic sediment fractions from the International Ocean Discovery Program Site U1456 in the eastern Arabian Sea to extract reliable chemical indicators not influenced by the grain-size effect, quantitatively estimate detrital provenance, and constrain silicate weathering/erosion in response to the Indian summer monsoon over orbital timescales. A provenance analysis of fine-grained siliciclastic sediments indicates a two end-member mixture from the Indus River (20-90%) and rivers draining the Deccan Traps (10-80%). A prominent increase in terrigenous input from the Indus River occurred at similar to 0.5 Ma, probably resulting from an intensive erosional event in the Himalayan region. Moreover, alpha(Al)(K) at Site U1456, which is calculated as Al/K ratio of the study sample versus Al/K ratio of the upper continental crust, can be generally used to reflect the chemical weathering intensity in the source regions. During most interglacial and even certain glacial periods, the Indian summer monsoon reinforcement is closely coupled with enhanced continental chemical weathering and physical erosion. Wavelet and spectral analyses of the alpha(Al)(K) record display strong 125-, 35-, 29-, and 23-kyr periodicities since 1.2 Ma with significant similar to 100-kyr cycles established at the end of the Mid-Pleistocene Transition (similar to 0.7 Ma), suggesting forcing mechanisms linked with both Northern and Southern Hemispheric processes. Significant fluctuations observed in silicate weathering/erosion during similar to 1.2-0.7 Ma indicate an enhancement of the Indian summer monsoon with increased variability in association with the Mid-Pleistocene Transition.
ISSN
2572-4525
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38691
DOI
10.1029/2019PA003732
Bibliographic Citation
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY, v.35, no.4, 2020
Publisher
AMER GEOPHYSICAL UNION
Keywords
International Ocean Discovery Program; Site U1456; eastern Arabian Sea; major and trace elements; Sr-Nd isotopes; Indian summer monsoon
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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