DOI: 10.1016/j.earscirev.2019.103030
论文题名: Provenance and tectonic setting of Upper Triassic turbidites in the eastern Tethyan Himalaya: Implications for early-stage evolution of the Neo–Tethys
作者: Liu Y.M. ; Dai J.G. ; Wang C.S. ; Li H.A. ; Wang Q. ; Zhang L.L.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 200 语种: 英语
中文关键词: Detrital zircon U[sbnd]Pb age
; Neo–Tethys
; Tethyan Himalaya
; Upper Triassic turbidite
英文关键词: basalt
; detrital deposit
; Gondwana
; igneous geochemistry
; petrography
; provenance
; sandstone
; tectonic setting
; trace element
; Triassic
; turbidite
; uranium-lead dating
; zircon
; Himalayas
英文摘要: Upper Triassic turbidites in the eastern Tethyan Himalaya preserve archives for early–stage evolution of the Neo–Tethys. However, their provenance and tectonic setting remain controversial. Here we report petrographic, detrital zircon U[sbnd]Pb and trace element data of newly discovered sandstones interbedded with layered basalts and whole–rock geochemical data of basalts from the Yumen mélange within Upper Triassic turbidites, and the same types of published data from associated terranes in the eastern Gondwana are compiled for comparison. The interbedded sandstones are dominated by quartz, lithics fragments and plagioclase grains, resembling those of the Langjiexue Group. All samples display similar ranges of detrital zircon U[sbnd]Pb ages, with significant age populations at 280–210 Ma, 650–450 Ma and 1200–800 Ma, comparable to those of the Langjiexue Group and coeval turbidites from Western Myanmar and partly from Central Tethyan Himalaya, implying they should share identical provenance. Trace elements of 300–200–Ma–aged zircons indicate they were derived from a continental magmatic arc. Geochemical data from interbedded basalts display typical within–plate–basalt affinity. Synthesized with regional geological setting, the above observations suggest Upper Triassic turbidites from Eastern and part of Central Tethyan Himalaya, and Western Myanmar were deposited in a marine rift basin of Indian passive continental margin with their primary provenance from Lhasa. However, other contemporaneous turbidites from part of Central Tethyan Himalaya and Australia had distinct primary sources from Indian continent and West Papua, respectively, indicating they may have separate deposystems. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166161
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: School of Earth Science and Resources, and Research Center for Tibetan Plateau Geology, China University of Geosciences, Beijing, 100083, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, China
Recommended Citation:
Liu Y.M.,Dai J.G.,Wang C.S.,et al. Provenance and tectonic setting of Upper Triassic turbidites in the eastern Tethyan Himalaya: Implications for early-stage evolution of the Neo–Tethys[J]. Earth Science Reviews,2020-01-01,200