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Occurrence of greigite in the Pliocene sediments of Lake Qinghai, China, and its paleoenvironmental and paleomagnetic implications
Fu, Chaofeng1,2; Bloemendal, Jan3; Qiang, Xiaoke2; Hill, Mimi J.3; An, Zhisheng2
2015-05-01
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
卷号16期号:5页码:1293-1306
文章类型Article
摘要

Lake Qinghai in North China is the largest interior plateau lake in Central Asia and is climatically sensitive. An almost continuous 626 m long sediment core was drilled in an infilled part of the southern lake basin of Lake Qinghai. The magnetic susceptibility record reveals the presence of two distinct peaks within an interval of fine-grained lacustrine sediments of Lower Pliocene age. We selected a depth interval of approximately 40 m spanning the magnetic susceptibility peaks for detailed rock magnetic and geochemical analyses in order to identify the magnetic mineralogy responsible and to assess its possible paleoenvironmental and paleomagnetic implications. Rock magnetic, X-ray diffraction analysis, scanning electron microscopy (SEM), and energy dispersive analysis of X-ray (EDAX) analyses reveal that the main magnetic carrier is greigite (Fe3S4). The greigite is of early diagenetic origin and formed in an inerval of high lake level and inferred relatively warm, humid climate. The greigite-enriched zones are separated by an interval of relatively high total sulfur and organic carbon content, and we infer that in the adjacent greigite-bearing zones, the lower concentrations of sulfur and organic carbon, and high levels of reactive iron, arrested the process of pyritization resulting in the preservation of the greigite on a time scale of several million years. The greigite zones contain narrow intervals of normally magnetized sediments which may be previously unrecognized cryptochrons within the Gilbert Chron, or alternatively they may reflect the continued formation of greigite long after the age of deposition of the surrounding sediment matrix.

关键词Greigite Lake Qinghai Sediments Rock Magnetism Paleoenvironment The Pliocene
WOS标题词Science & Technology ; Physical Sciences
DOI10.1002/2014GC005677
关键词[WOS]Iron Sulfide Minerals ; Magnetic-properties ; Pyrite Formation ; Organic-matter ; Hysteresis Properties ; Holocene Sediments ; Marine-sediments ; Climate-change ; Asian Monsoon ; Record
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000356710000004
出版者AMER GEOPHYSICAL UNION
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9304
专题古环境研究室
通讯作者Fu, Chaofeng
作者单位1.Changan Univ, Key Lab Western Mineral Resources & Geol Engn, Minist Educ China, Xian, Peoples R China
2.Chinese Acad Sci, Inst Earth & Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China
3.Univ Liverpool, Sch Environm Sci, Geomagnetism Lab, Liverpool L69 3BX, Merseyside, England
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Fu, Chaofeng,Bloemendal, Jan,Qiang, Xiaoke,et al. Occurrence of greigite in the Pliocene sediments of Lake Qinghai, China, and its paleoenvironmental and paleomagnetic implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2015,16(5):1293-1306.
APA Fu, Chaofeng,Bloemendal, Jan,Qiang, Xiaoke,Hill, Mimi J.,&An, Zhisheng.(2015).Occurrence of greigite in the Pliocene sediments of Lake Qinghai, China, and its paleoenvironmental and paleomagnetic implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,16(5),1293-1306.
MLA Fu, Chaofeng,et al."Occurrence of greigite in the Pliocene sediments of Lake Qinghai, China, and its paleoenvironmental and paleomagnetic implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 16.5(2015):1293-1306.
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