气候变化领域集成服务门户(CCPortal): Mineral magnetic study of lacustrine sediments from Lake Pumoyum Co, southern Tibet, over the last 19 ka and paleoenvironmental significance

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DOI	10.1016/j.tecto.2012.12.017
	Mineral magnetic study of lacustrine sediments from Lake Pumoyum Co, southern Tibet, over the last 19 ka and paleoenvironmental significance
	Su, Youliang; Gao, Xing; Liu, Qingsong; Wang, Junbo; Haberzettl, Torsten; Zhu, Liping; Li, Jinhua; Duan, Zongqi; Tian, Lide
通讯作者	Gao, X (通讯作者)
发表日期	2013
ISSN	0040-1951
EISSN	1879-3266
起始页码	209
结束页码	221
卷号	588
英文摘要	High-resolution proxy records from Tibetan Plateau are essential to understand the past climatic and environmental changes. In this work, we conducted systematic environmental magnetic studies on lacustrine sediments from Lake Pumoyum Co, southern Tibet, spanning from the last deglaciation (similar to 19 ka) to present. We correlated the magnetic proxies in the lake core with environmental changes. The magnetic proxies from the 3 units were studied. Both Unit 3 (19-13.2 ka) and Unit 2 (13.2-8.4 Ica) contain evidences for an anoxic or sub-anoxic environment. Fine-grained greigite dominates the bulk magnetic properties of Unit 3, while both magnetite and greigite coexist in Unit 2. Overall, this reveals a transition from an anoxic environment to an oxic environment. In contrast, Unit 1 (8.4 ka-present) spans the Holocene when the lake environment was oxic. There is an increasing trend in the concentration of magnetic minerals, which reflects an increasing transport of magnetic minerals from the catchment into the lake due to the increased post-glacial melt-water flow. Although different mechanisms affect the magnetic assemblage and associated magnetic properties in the different units, our results suggest that the magnetic proxies of the local lake environment on southern Tibet are sensitive to environmental changes. (C) 2012 Elsevier B.V. All rights reserved.
关键词	OXYGEN-ISOTOPE RECORD GRAIN-SIZE ENVIRONMENTAL-CHANGES MARINE-SEDIMENTS DIAGENETIC FORMATION ROCK MAGNETISM ASIAN MONSOON NAM-CO PYRRHOTITE GREIGITE
英文关键词	Environmental magnetism; Lake sediments; Pumoyum Co; Tibetan Plateau; Paleoenvironment
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000319310700015
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258166
推荐引用方式 GB/T 7714	Su, Youliang,Gao, Xing,Liu, Qingsong,et al. Mineral magnetic study of lacustrine sediments from Lake Pumoyum Co, southern Tibet, over the last 19 ka and paleoenvironmental significance[J]. 中国科学院青藏高原研究所,2013,588.
APA	Su, Youliang.,Gao, Xing.,Liu, Qingsong.,Wang, Junbo.,Haberzettl, Torsten.,...&Tian, Lide.(2013).Mineral magnetic study of lacustrine sediments from Lake Pumoyum Co, southern Tibet, over the last 19 ka and paleoenvironmental significance.TECTONOPHYSICS,588.
MLA	Su, Youliang,et al."Mineral magnetic study of lacustrine sediments from Lake Pumoyum Co, southern Tibet, over the last 19 ka and paleoenvironmental significance".TECTONOPHYSICS 588(2013).