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DOI	10.1016/j.jseaes.2021.105029
	Holocene variability in chemical weathering and ocean redox state: A reconstruction using sediment geochemistry of the Arabian Sea
	Samanta, Anupam; Tripathy, Gyana Ranjan; Nath, B. Nagender; Bhushan, Ravi; Panchang, Rajani; Bharti, Nisha; Shrivastava, Ankush
通讯作者	Samanta, A (corresponding author), Indian Inst Sci Educ & Res, Dept Earth & Climate Sci, Pune 411008, Maharashtra, India.
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
EISSN	1878-5786
出版年	2022
卷号	224
英文摘要	Major and trace elemental geochemistry of a sediment core (SSK40/GC10; water depth similar to 50 m) from the eastern Arabian Sea (17 degrees 59.89123 N, 72 degrees 22.45161 E) have been investigated to reconstruct the continental weathering pattern and ocean redox state between 7.2 and 0.8 kyr BP (kyr, hereafter). The covariations of Fe/Al with K/Al and Ti/Al ratios indicate that the western-flowing Indian rivers (e.g., Narmada, Tapi, and Mahi) and eolian supply from the Thar regions are the major sediment suppliers to this location. Factor analysis of the geochemical dataset identifies four major factors explaining about 80 % of the total variance. Down-core profiles of several detrital proxies (Fe/Al, Ti/Al, V/Al, and Co/Al) show that the sediment sources were nearly uniform until 2.6 kyr. In contrast, changes in provenance indices, K/Al ratios, and CIA* (modified Chemical Index of Alteration) have been observed in the upper part of the core. The period of these weathering changes (2.6-1.6 kyr) mostly overlaps with the Roman Warm Period, indicating a weathering-climate linkage. Variations in the Ba/Al ratios and enrichment factors of U (EF-U) and Mo (EF-Mo), along with TOC/Al, and S/Al trends, indicate a fluctuating oceanic (bottom water) redox state during the studied period. These trends point to a shift from oxic to anoxic bottom water condition since similar to 4.2 kyr. The timing of this change is synchronous to the earlier reported drought phase at the beginning of the Meghalayan stage, underscoring climatic control on the bottom water redox state.
英文关键词	Geochemistry Chemical weathering Monsoon Himalaya Deccan Redox state
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000729115900003
WOS关键词	SUMMER MONSOON ; CLIMATE-CHANGE ; SOUTHERN SAURASHTRA ; INDIA IMPLICATIONS ; CONTINENTAL-SHELF ; RIVER SEDIMENTS ; DECCAN TRAPS ; TRACE-METALS ; THAR DESERT ; CARBON
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374508
作者单位	[Samanta, Anupam; Tripathy, Gyana Ranjan] Indian Inst Sci Educ & Res, Dept Earth & Climate Sci, Pune 411008, Maharashtra, India; [Nath, B. Nagender] CSIR Natl Inst Oceanog, Panaji, Goa, India; [Bhushan, Ravi; Bharti, Nisha] Phys Res Lab, Ahmadabad, Gujarat, India; [Panchang, Rajani] Savitribai Phule Pune Univ, Pune, Maharashtra, India; [Shrivastava, Ankush] Mohanlal Sukhadia Univ, Dept Geol, Udaipur, Rajasthan, India
推荐引用方式 GB/T 7714	Samanta, Anupam,Tripathy, Gyana Ranjan,Nath, B. Nagender,et al. Holocene variability in chemical weathering and ocean redox state: A reconstruction using sediment geochemistry of the Arabian Sea[J],2022,224.
APA	Samanta, Anupam.,Tripathy, Gyana Ranjan.,Nath, B. Nagender.,Bhushan, Ravi.,Panchang, Rajani.,...&Shrivastava, Ankush.(2022).Holocene variability in chemical weathering and ocean redox state: A reconstruction using sediment geochemistry of the Arabian Sea.JOURNAL OF ASIAN EARTH SCIENCES,224.
MLA	Samanta, Anupam,et al."Holocene variability in chemical weathering and ocean redox state: A reconstruction using sediment geochemistry of the Arabian Sea".JOURNAL OF ASIAN EARTH SCIENCES 224(2022).