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DOI10.1016/j.epsl.2010.06.050
In-situ detrital zircon geochronology and Hf isotopic analyses from Upper Triassic Tethys sequence strata
Li Guangwei; Liu Xiaohan; Alex, Pullen; Wei Lijie; Liu Xiaobing; Huang Feixin; Zhou Xuejun
通讯作者Liu, XH (通讯作者)
发表日期2010
ISSN0012-821X
EISSN1385-013X
起始页码461
结束页码470
卷号297期号:3-4
英文摘要Marine sedimentary rocks of the Tethyan Himalayan sequence exposed south of the India-Asia suture and north of the high Himalayan mountain belt are widely attributed to India's passive margin along the southern margin of the Neo-Tethys ocean. The focus of this study are the Tethyan sequence strata exposed in southern Tibet that yield U-Pb detrital zircon age probability spectra and epsilon Hf values that are in stark contrast with Tethyan sequence strata of known Indian affinity. The rocks of the Upper Triassic Songre and Nieru Formations, exposed <10 km south of the India-Asia suture, yield populations of U-Pb zircon ages in the range of similar to 450-220 Ma. Detrital zircon crystals of this age are not known to populate India affinity Tethyan sequence strata. The youngest cluster of ages, in the range of similar to 266-224 Ma, typically have juvenile epsilon(Hf(T)) values (+5.5-+13.5). Zircon ages and epsilon(Hf(T)) values in this range are consistent with igneous rocks of the Lhasa terrane on the northern margin of the Neo-Tethys ocean during Triassic time or with a hypothesized juvenile arc source from within the Neo-Tethys ocean. Collectively these unexpected results highlight the current uncertainties over the nature Neo-Tethys ocean and tectonic setting of the southern Lhasa prior to the India-Asia collision. We propose that the Upper Triassic age northern Tethyan Himalayan strata studied here represent an independent terrane from the widely studied southern Tethyan Himalayan strata. These rocks where isolated from the southern Tethyan Himalayan strata during Late Triassic time. This isolation was the result of a bathymetric barrier within the Neo-Tethys ocean such as a spreading center or an inter-Tethys arc system. (C) 2010 Elsevier B.V. All rights reserved.
关键词FOLD-THRUST BELTU-PBSOUTHERN TIBETTECTONIC EVOLUTIONLHASA TERRANESUTURE ZONESEDIMENTARY RECORDCRETACEOUS STRATAOROGENIC BELTHIMALAYA
英文关键词detrital zircon; Hf isotope; Tethyan sequence; Lhasa terrane; Late Triassic
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000282209300013
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
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/257789
推荐引用方式
GB/T 7714
Li Guangwei,Liu Xiaohan,Alex, Pullen,et al. In-situ detrital zircon geochronology and Hf isotopic analyses from Upper Triassic Tethys sequence strata[J]. 中国科学院青藏高原研究所,2010,297(3-4).
APA Li Guangwei.,Liu Xiaohan.,Alex, Pullen.,Wei Lijie.,Liu Xiaobing.,...&Zhou Xuejun.(2010).In-situ detrital zircon geochronology and Hf isotopic analyses from Upper Triassic Tethys sequence strata.EARTH AND PLANETARY SCIENCE LETTERS,297(3-4).
MLA Li Guangwei,et al."In-situ detrital zircon geochronology and Hf isotopic analyses from Upper Triassic Tethys sequence strata".EARTH AND PLANETARY SCIENCE LETTERS 297.3-4(2010).
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