气候变化领域集成服务门户(CCPortal): Recognition of tuffs in the middle-upper Dingqinghu Fm.; Lunpola Basin; central Tibetan Plateau: Constraints on stratigraphic age and implications for paleoclimate

CCPortal

DOI	10.1016/j.palaeo.2019.03.040
	Recognition of tuffs in the middle-upper Dingqinghu Fm.; Lunpola Basin; central Tibetan Plateau: Constraints on stratigraphic age and implications for paleoclimate
	Mao Z.; Meng Q.; Fang X.; Zhang T.; Wu F.; Yang Y.; Zhang W.; Zan J.; Tan M.
发表日期	2019
ISSN	0031-0182
起始页码	44
结束页码	56
卷号	525
英文摘要	The Lunpola Basin plays a key role in determining the elevation history of the central Tibetan Plateau, which is closely related to uplift dynamics and paleoclimatic evolution. However, accurate age constraints on the basin stratigraphy reflecting tectonic, paleo-elevation and climate information have long been vigorously debated, mostly due to a lack of absolute age controls. Here, we found two altered tuff layers in the middle-upper Dingqinghu Formation (Fm.) in the basin stratigraphic sequence. Detailed lithological, mineralogical and geochemical analyses of the tuffs indicate that they came from trachyandesite and identify analcime as the typical alteration mineral, suggesting primary deposition. LA-ICP-MS zircon U-Pb dating of the tuffs yields concordant ages of 20.6 ± 0.1 Ma and 20.7 ± 0.1 Ma, indicating that the end of the Dingqinghu Fm., i.e., the Lunpola stratigraphic sequence, and the uplift of the plateau to its current high elevations occurred much later than previously estimated. The contemporaneous thick black oil shales in the Lunpola deep lake and biocoenosis together suggest that the climate was humid and warm during this period. © 2019 Elsevier B.V.
英文关键词	Analcime; Climate; Early-middle Miocene; Zircon U-Pb dating
语种	英语
scopus关键词	allostratigraphy; analcime; biocoenosis; climate change; Miocene; oil shale; paleoclimate; tectonic evolution; uranium-lead dating; zircon; China; Lunpola Basin; Qinghai-Xizang Plateau; Xizang
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/150961
作者单位	CAS Center for Excellence in Tibetan Plateau Earth Sciences, Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China; School of Earth Sciences, Key Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Mao Z.,Meng Q.,Fang X.,et al. Recognition of tuffs in the middle-upper Dingqinghu Fm.; Lunpola Basin; central Tibetan Plateau: Constraints on stratigraphic age and implications for paleoclimate[J],2019,525.
APA	Mao Z..,Meng Q..,Fang X..,Zhang T..,Wu F..,...&Tan M..(2019).Recognition of tuffs in the middle-upper Dingqinghu Fm.; Lunpola Basin; central Tibetan Plateau: Constraints on stratigraphic age and implications for paleoclimate.Palaeogeography, Palaeoclimatology, Palaeoecology,525.
MLA	Mao Z.,et al."Recognition of tuffs in the middle-upper Dingqinghu Fm.; Lunpola Basin; central Tibetan Plateau: Constraints on stratigraphic age and implications for paleoclimate".Palaeogeography, Palaeoclimatology, Palaeoecology 525(2019).