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

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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, Ziqiang; Meng, Qingquan; Fang, Xiaomin; Zhang, Tao; Wu, Fuli; Yang, Yibo; Zhang, Weilin; Zan, Jinbo; Tan, Mengqi
通讯作者	Fang, XM (通讯作者)
发表日期	2019
ISSN	0031-0182
EISSN	1872-616X
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.
关键词	SOUTHERN TIBET ASIAN MONSOONS VOLCANIC-ROCKS NORTHERN TIBET LATE EOCENE UPLIFT EVOLUTION CLIMATE PALEOELEVATION MAGMATISM
英文关键词	Analcime; Zircon U-Pb dating; Early-middle Miocene; Climate
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000468711700004
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259473
推荐引用方式 GB/T 7714	Mao, Ziqiang,Meng, Qingquan,Fang, Xiaomin,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]. 中国科学院青藏高原研究所,2019,525.
APA	Mao, Ziqiang.,Meng, Qingquan.,Fang, Xiaomin.,Zhang, Tao.,Wu, Fuli.,...&Tan, Mengqi.(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, Ziqiang,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).