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A Pedogenic Model for the Magnetic Enhancement of Late Miocene Fluvial-Lacustrine Sediments From the Xining Basin, NE Tibetan Plateau
Zan, JB (Zan, Jinbo)1,2,3; Kang, J (Kang, Jian)1,2,3; 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; Zhang, WL (Zhang, Weilin)1,2,3; Fang, YH (Fang, Yahui)1,2,3
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2018-08-01
Volume123Issue:8Pages:6176-6194
DOI10.1029/2018JB016064 
Abstract

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.

Subject Area地质学
WOS IDWOS:000446170700002
Language英语
Indexed BySCIE
KeywordChinese Loess Plateau Late Cenozoic Deformation Driven Climate-change Paleoclimatic Implications Central-asia Grain-size Northeastern Tibet Mammalian Faunas Paleosol Samples Lanzhou Basin
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN2169-9313
Department大陆碰撞与高原隆升重点实验室
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8575
Collection图书馆
Corresponding AuthorZan, JB (Zan, Jinbo)
Affiliation1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China;
2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing, Peoples R China;
3.Univ Chinese Acad Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zan, JB ,Kang, J ,Yan, MD ,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 Zan, JB .,Kang, J .,Yan, MD .,Fang, XM .,Li, XJ .,...&Fang, YH .(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 Zan, JB ,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.
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