气候变化领域集成服务门户(CCPortal): Paleoclimatic implications of magnetic susceptibility in Late Pliocene-Quaternary sediments from deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau)

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DOI	10.1029/2011JB008949
	Paleoclimatic implications of magnetic susceptibility in Late Pliocene-Quaternary sediments from deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau)
	Zhang, Weilin; Appel, Erwin; Fang, Xiaomin; Yan, Maodu; Song, Chunhui; Cao, Liwan
通讯作者	Appel, E (通讯作者)
发表日期	2012
ISSN	2169-9313
EISSN	2169-9356
卷号	117
英文摘要	Lake sediments are important archives of paleoclimate change and erosion history. A 938.5 m long core (SG-1) of lacustrine sediments, dated at 2.77 Ma to 0.1 Ma, was obtained from the western Qaidam Basin in the northeastern Tibetan Plateau, consisting of dark grayish mudstone and grayish siltstone, intercalated with salts and fine sandstones in the upper part. Magnetic susceptibility data, combined with detailed rock magnetic properties, were analyzed for revealing the significance of ferro(i)magnetic concentration for past changes of climate and erosion. Mass-specific susceptibility (chi) shows a striking cyclic and long-term variation. Samples with high chi values are dominated by magnetite and maghemite with pseudo-single-domain properties. In contrast, samples with low chi values contain maghemite from single-domain to multidomain and, additionally, a significant fraction of hematite. The driving mechanism of chi variation can be explained by three alternative models: (1) different source regions with alternations of wind and cryoclastic erosion in a wider hinterland (dry-cold climate) and surface runoff erosion from a narrower area (more humid climate) and (2 and 3) low-temperature oxidation, occurring either in the lake sediments (dry climate) or in the catchment area during weathering (more humid climate). Trends of chi match with changes in sedimention rates and are roughly synchronous with the deep-sea delta O-18 record on a glacial-interglacial timescale. Therefore, the concentration of magnetic minerals in the western Qaidam Basin sediments is likely controlled by both tectonic influence and paleoenvironmental changes but can be best interpreted by alternations and trends of dry-cold and more humid periods due to Asian drying and global cooling.
关键词	ALTYN-TAGH FAULT GRAIN-SIZE REMANENT MAGNETIZATION QINGHAI PROVINCE EARLY DIAGENESIS LAKE-SEDIMENTS SEA SEDIMENTS LATE NEOGENE RECORD UPLIFT
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000304768300001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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/258059
推荐引用方式 GB/T 7714	Zhang, Weilin,Appel, Erwin,Fang, Xiaomin,et al. Paleoclimatic implications of magnetic susceptibility in Late Pliocene-Quaternary sediments from deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau)[J]. 中国科学院青藏高原研究所,2012,117.
APA	Zhang, Weilin,Appel, Erwin,Fang, Xiaomin,Yan, Maodu,Song, Chunhui,&Cao, Liwan.(2012).Paleoclimatic implications of magnetic susceptibility in Late Pliocene-Quaternary sediments from deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau).JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,117.
MLA	Zhang, Weilin,et al."Paleoclimatic implications of magnetic susceptibility in Late Pliocene-Quaternary sediments from deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau)".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 117(2012).