气候变化领域集成服务门户(CCPortal): Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21 kyr

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DOI	10.1016/j.palaeo.2018.11.035
	Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21 kyr – A sediment record from the Andaman Sea
	Sebastian T.; Nagender Nath B.; Venkateshwarlu M.; Miriyala P.; Prakash A.; Linsy P.; Kocherla M.; Kazip A.; Sijinkumar A.V.
发表日期	2019
ISSN	0031-0182
起始页码	22
结束页码	34
卷号	516
英文摘要	The paleomonsoonal variations and their impact on the weathering patterns in the source regions of sediments of the Andaman Sea were investigated from a 21 kyr sedimentary record using environmental magnetic, clay mineralogical and geochemical techniques. The sediment provenance of the study area determined from the geochemical discrimination diagrams and available εNd records indicates that the Western Andaman Sea receives a considerable contribution from the Indo-Burman ranges (IBR) and local sources compared to the central and eastern Andaman Sea. The results illustrate a strong Indian Summer Monsoon (ISM) during the late glacial (16–13 kyr), early (10.5–8.5 kyr) and middle Holocene (5–3.5 kyr) and a weak ISM during the Younger Dryas (12.9–11.7 kyr) and late Holocene (3.5–0 kyr) periods. The mineral magnetic grain size parameters (χARM/SIRM, SIRM/χLF, χARM/χLF) show finer grain sizes during the strong ISM periods indicating the increased chemical weathering while cold and dry periods are marked by an increase in magnetic grain size indicating the shift from chemical to physical weathering in the source regions. The results from our study are in agreement with the global and local records of paleoclimate and weathering and exhibit a close correlation with the solar insolation data suggesting the major role played by the solar forcing on the ISM variability. © 2018 Elsevier B.V.
英文关键词	Chemical Weathering; Clay Mineralogy; Environmental Magnetism; Geochemistry; Myanmar; Paleomonsoon
语种	英语
scopus关键词	chemical weathering; clay mineral; geochemistry; grain size; Holocene; late glacial; monsoon; paleoclimate; paleomagnetism; provenance; sediment chemistry; summer; Younger Dryas; Andaman Sea; India; Indian Ocean; Myanmar
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151104
作者单位	CSIR - National Institute of Oceanography, Dona Paula, Goa 403004, India; CSIR – National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India; Department of Geology, Central University of Kerala, Kasaragod, India
推荐引用方式 GB/T 7714	Sebastian T.,Nagender Nath B.,Venkateshwarlu M.,等. Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21 kyr – A sediment record from the Andaman Sea[J],2019,516.
APA	Sebastian T..,Nagender Nath B..,Venkateshwarlu M..,Miriyala P..,Prakash A..,...&Sijinkumar A.V..(2019).Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21 kyr – A sediment record from the Andaman Sea.Palaeogeography, Palaeoclimatology, Palaeoecology,516.
MLA	Sebastian T.,et al."Impact of the Indian Summer Monsoon variability on the source area weathering in the Indo-Burman ranges during the last 21 kyr – A sediment record from the Andaman Sea".Palaeogeography, Palaeoclimatology, Palaeoecology 516(2019).