气候变化领域集成服务门户(CCPortal): A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau

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DOI	10.1029/2018JB016064
	A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau
	Zan, Jinbo; Kang, Jian; Yan, Maodu; Fang, Xiaomin; Li, Xiaojing; Guan, Chong; Zhang, Weilin; Fang, Yahui
通讯作者	Zan, JB (通讯作者)
发表日期	2018
ISSN	2169-9313
EISSN	2169-9356
起始页码	6176
结束页码	6194
卷号	123 期号:8
英文摘要	Continuous sequences of Cenozoic fluvial-lacustrine sediments are well preserved in the northeastern edge of the Tibetan Plateau (TP), and they provide a good opportunity to improve our understanding of the tectonic uplift and paleoenvironmental evolution of the NE TP. To date, however, the factors controlling the variations in the magnetic properties of these fluvial-lacustrine sediments remain complex and ambiguous. Here we systematically assess the contribution of pedogenesis to the magnetic enhancement of late Miocene fluvial-lacustrine sediments in the Xining Basin, using a combination of rock magnetic, diffuse reflectance spectroscopy, and geochemical methods. Our results demonstrate that the magnetic concentration parameters show a long-term increasing trend since the late Miocene, with two dramatic increases at similar to 11 and 9 Ma. Based on the examination of several factors that may affect the magnetic properties of fluvial-lacustrine sediments in the NE TP, we argue that an accelerated drying process in waterlogged environments, induced by late Miocene global cooling or/and tectonic uplift, may have caused the changes from anaerobic to aerobic conditions and resulted in the observed stepwise increases in pedogenic intensity. The two dramatic increases in magnetic parameters are closely related to intensified aridification and tectonic activity in the NE TP at similar to 11 and 9 Ma, respectively. These observations suggest that the pedogenic magnetic enhancement model, caused by the disappearance of a waterlogged and reducing pedogenic environment since the late Miocene, should be reconsidered as a possible factor explaining the magnetic properties of fluvial-lacustrine sediments in the NE TP.
关键词	CHINESE LOESS PLATEAU LATE CENOZOIC DEFORMATION DRIVEN CLIMATE-CHANGE PALEOCLIMATIC IMPLICATIONS CENTRAL-ASIA GRAIN-SIZE NORTHEASTERN TIBET MAMMALIAN FAUNAS PALEOSOL SAMPLES LANZHOU BASIN
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000446170700002
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/259128
推荐引用方式 GB/T 7714	Zan, Jinbo,Kang, Jian,Yan, Maodu,et al. A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,123(8).
APA	Zan, Jinbo.,Kang, Jian.,Yan, Maodu.,Fang, Xiaomin.,Li, Xiaojing.,...&Fang, Yahui.(2018).A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(8).
MLA	Zan, Jinbo,et al."A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.8(2018).