globalchange  > 气候减缓与适应
DOI: 10.1016/j.palaeo.2018.11.035
WOS记录号: WOS:000456903000003
论文题名:
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
作者: Sebastian, Tyson1; Nath, B. Nagender1; Venkateshwarlu, M.2; Miriyala, Pavan2; Prakash, Archana1; Linsy, P.1; Kocherla, M.1; Kazip, Armoury1; Sijinkumar, A. V.3
通讯作者: Nath, B. Nagender
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN: 0031-0182
EISSN: 1872-616X
出版年: 2019
卷: 516, 页码:22-34
语种: 英语
英文关键词: Environmental Magnetism ; Chemical Weathering ; Paleomonsoon ; Myanmar ; Clay Mineralogy ; Geochemistry
WOS关键词: NORTHERN-HEMISPHERE ; CLIMATIC CHANGES ; OCEAN MONSOON ; PROVENANCE ; HISTORY ; BASIN ; CLAY ; BAY ; HIMALAYAN ; EVOLUTION
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向: Physical Geography ; Geology ; Paleontology
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 erqd 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 (chi(ARM)/SIAM, SIRM/chi(LF), chi(ARM)/chi(LF)) 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.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/129876
Appears in Collections:气候减缓与适应

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作者单位: 1.Natl Inst Oceanog, CSIR, Panaji 403004, Goa, India
2.Natl Geophys Res Inst, CSIR, Uppal Rd, Hyderabad 500007, Andhra Pradesh, India
3.Cent Univ Kerala, Dept Geol, Kasaragod, India

Recommended Citation:
Sebastian, Tyson,Nath, B. Nagender,Venkateshwarlu, M.,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[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019-01-01,516:22-34
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