A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau
文献类型:期刊论文
作者 | Yan, MD (Yan, Maodu)1,2,3; Fang, XM (Fang, Xiaomin)1,2,3; Li, XJ (Li, Xiaojing)1,2,3; Guan, C (Guan, Chong)1,2,3; Fang, YH (Fang, Yahui)1,2,3; Zhang, WL (Zhang, Weilin)1,2,3; Zan, JB (Zan, Jinbo)1,2,3; Kang, J (Kang, Jian)1,2,3 |
刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH |
出版日期 | 2018-08-01 |
卷号 | 123期号:8页码:6176-6194 |
ISSN号 | 2169-9313 |
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 |
DOI | 10.1029/2018JB016064 |
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. |
学科主题 | 地质学 |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | AMER GEOPHYSICAL UNION |
WOS记录号 | WOS:000446170700002 |
源URL | [http://ir.itpcas.ac.cn/handle/131C11/8575] |
专题 | 青藏高原研究所_图书馆 |
通讯作者 | Zan, JB (Zan, Jinbo) |
作者单位 | 1.Univ Chinese Acad Sci, Beijing, Peoples R China. 2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing, Peoples R China; 3.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China; |
推荐引用方式 GB/T 7714 | Yan, MD ,Fang, XM ,Li, XJ ,et al. A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(8):6176-6194. |
APA | Yan, MD .,Fang, XM .,Li, XJ .,Guan, C .,Fang, YH .,...&Kang, J .(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),6176-6194. |
MLA | Yan, MD ,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):6176-6194. |
入库方式: OAI收割
来源:青藏高原研究所
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