气候变化领域集成服务门户(CCPortal): Eocene to Miocene paleoclimate reconstruction of the northern Tibetan Plateau: constraints from mineralogy, carbon and oxygen isotopes of lacustrine carbonates in the western Qaidam Basin

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DOI	10.3389/feart.2023.1217304
	Eocene to Miocene paleoclimate reconstruction of the northern Tibetan Plateau: constraints from mineralogy, carbon and oxygen isotopes of lacustrine carbonates in the western Qaidam Basin
	Li, Shien; Liu, Peixian; Guan, Ping; Zhang, Daowei; Xia, Xiaomin; Ding, Xiaonan; Zhang, Chi; Zhang, Jihua; Tang, Jianzhou
发表日期	2023
EISSN	2296-6463
卷号	11
英文摘要	The Cenozoic climatic evolution of the Tibetan Plateau (TP), together with its driving mechanism, have been a subject of interest for decades. This study presents detailed sedimentology, mineralogical (XRD), carbon, and oxygen isotope analyses of lacustrine deposits from the Eocene to the Miocene in the western Qaidam Basin, the northern TP. The petrological observation and XRD data of 109 samples reveal that the sediments are composed of mixed siliciclastic, carbonate, and evaporate minerals. And the carbonate isotopic results show negative delta C-13 (-7.49 parts per thousand to -3.41 parts per thousand) and negative to slightly positive delta(18) values (-14.65 parts per thousand to 0.2 parts per thousand). Both isotopes display a positive correlation with the contents of carbonates and evaporates, which suggests that evaporation is the major controlling factor of carbon and oxygen isotope. Therefore, the isotopes can be used as reliable indicators of the intensity of evaporation for paleoclimatic reconstruction. The reconstruction results reveal three distinct arid stages: top of the lower Xiaganchaigou Formation to the upper Xiaganchaigou Formation (ca.40-32 Ma), bottom of the Xiayoushashan Formation (ca.22-20 Ma), top of the Shangyoushashan Formation (ca.13-8.2 Ma). We suggest that the aridity during similar to 40-32 Ma may have been related to the regression of the Paratethys Sea and uplift of the TP, while the aridity during 22-20 Ma may have been caused by the uplift and denudation of the mountains around the basin. The aridity after similar to 13 Ma could be attributed to both global cooling and tectonic events in the northern TP. Furthermore, by comparing the climate records of the Qaidam Basin with those of other basins in Central Asia, a regional correlation can be established between different basins during the first and third drought stages. This study reveals that during the Eocene to Miocene, the climate change between different regions in the Qaidam Basin was synchronized and had a good connection with the surrounding basins, which responded to global climate change and regional tectonic activities.
关键词	northern margin of Tibetan Plateau Qaidam Basin cenozoic carbon and oxygen isotopes climate evolution
英文关键词	STABLE-ISOTOPE; MIDDLE MIOCENE; CLIMATE-CHANGE; CENOZOIC UPLIFT; CENTRAL-ASIA; INTENSIFIED ARIDITY; TOPOGRAPHIC GROWTH; REGIONAL TECTONICS; NORTHEASTERN TIBET; SEDIMENTARY RECORD
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001019554300001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283879
作者单位	Peking University; China National Petroleum Corporation; Xi'an University of Science & Technology
推荐引用方式 GB/T 7714	Li, Shien,Liu, Peixian,Guan, Ping,et al. Eocene to Miocene paleoclimate reconstruction of the northern Tibetan Plateau: constraints from mineralogy, carbon and oxygen isotopes of lacustrine carbonates in the western Qaidam Basin[J],2023,11.
APA	Li, Shien.,Liu, Peixian.,Guan, Ping.,Zhang, Daowei.,Xia, Xiaomin.,...&Tang, Jianzhou.(2023).Eocene to Miocene paleoclimate reconstruction of the northern Tibetan Plateau: constraints from mineralogy, carbon and oxygen isotopes of lacustrine carbonates in the western Qaidam Basin.FRONTIERS IN EARTH SCIENCE,11.
MLA	Li, Shien,et al."Eocene to Miocene paleoclimate reconstruction of the northern Tibetan Plateau: constraints from mineralogy, carbon and oxygen isotopes of lacustrine carbonates in the western Qaidam Basin".FRONTIERS IN EARTH SCIENCE 11(2023).