气候变化领域集成服务门户(CCPortal): Paleoclimate change since the Miocene inferred from clay-mineral records of the Jiuquan Basin; NW China

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DOI	10.1016/j.palaeo.2020.109730
	Paleoclimate change since the Miocene inferred from clay-mineral records of the Jiuquan Basin; NW China
	Liu Y.; Song C.; Meng Q.; He P.; Yang R.; Huang R.; Chen S.; Wang D.; Xing Z.
发表日期	2020
ISSN	0031-0182
卷号	550
英文摘要	Global cooling and the uplift of the Tibetan Plateau have long been considered the crucial controls of the climate change in inland Asia since the Cenozoic. However, which of these factors has played the leading role is unknown. To understand climate change and the controlling factors in inland Asia, here, we present new records of clay mineralogy and trace elements of clay fractions from the Neogene sedimentary sequence in the Jiuquan Basin of the northeastern Tibetan Plateau. The clay-mineral records reveal four stages of paleoclimate changes. From ca. 24 Ma to 17 Ma, the low total smectite and (smectite+I/S mixed layers+kaolinite)/(illite+chlorite) and high illite contents suggest weak chemical weathering and hence arid climatic conditions. For ca. 17–14 Ma, the high total smectite and (total smectite+kaolinite)/(illite+chlorite) and low illite contents suggest strong chemical weathering, indicating a change in climate from cold and dry to warm and humid. There was no palygorskite during this warm and humid period. From ca. 14 Ma to 8 Ma, the low total smectite content, high illite content and the appearance of palygorskite indicate that the climate turned to cold and dry. Since 8 Ma, low total smectite as well as high illite and chlorite contents suggest a colder and drier period. The records of clay mineralogy illustrate that the Jiuquan Basin has experienced increasing aridity since ca. 14 Ma, synchronous with the inland Asian aridification. Given the synchroneity with the global cooling, we suggest that the climate evolution in the Jiuquan Basin from the late Oligocene to middle-late Miocene was mainly controlled by global climate change. Since the late Miocene, the uplift of the Tibetan Plateau and global cooling have significantly influenced the decreasing temperature and humidity of the Jiuquan Basin. The uplift of Tibetan Plateau may intensify the aridity by blocking moisture from reaching the Jiuquan Basin. © 2020 Elsevier B.V.
英文关键词	Aridification; Global cooling; Inland Asia; Neogene; Tibetan Plateau
语种	英语
scopus关键词	chemical weathering; chlorite; clay mineral; climate change; cooling; global climate; mineralogy; Miocene; Neogene; Oligocene; paleoclimate; palygorskite; sedimentary sequence; smectite; China; Gansu; Jiuquan Basin; Qinghai-Xizang Plateau
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150494
作者单位	School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, China; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of the Chinese Academy of Sciences, Beijing, 100049, China; Centre de Recherches Pétrographiques et Géochimiques, UMR7358, CNRS, Université de Lorraine, Nancy, 54500, France
推荐引用方式 GB/T 7714	Liu Y.,Song C.,Meng Q.,et al. Paleoclimate change since the Miocene inferred from clay-mineral records of the Jiuquan Basin; NW China[J],2020,550.
APA	Liu Y..,Song C..,Meng Q..,He P..,Yang R..,...&Xing Z..(2020).Paleoclimate change since the Miocene inferred from clay-mineral records of the Jiuquan Basin; NW China.Palaeogeography, Palaeoclimatology, Palaeoecology,550.
MLA	Liu Y.,et al."Paleoclimate change since the Miocene inferred from clay-mineral records of the Jiuquan Basin; NW China".Palaeogeography, Palaeoclimatology, Palaeoecology 550(2020).