globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117054
Short duration of Early Permian Qiangtang-Panjal large igneous province: Implications for origin of the Neo-Tethys Ocean
Author: Dan W.; Wang Q.; Murphy J.B.; Zhang X.-Z.; Xu Y.-G.; White W.M.; Jiang Z.-Q.; Ou Q.; Hao L.-L.; Qi Y.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 568
Language: 英语
keyword in Chinese: geochronology ; large igneous province ; mantle plume ; Neo-Tethys ; slab pull ; Tibetan Plateau
Keyword: Binary alloys ; Lead alloys ; Secondary ion mass spectrometry ; Structural geology ; Thermal plumes ; Uranium alloys ; Zircon ; Geodynamic setting ; Igneous province ; Large igneous province ; Mantle plume ; Neo-tethys ; Permian ; Qiangtang ; Short durations ; Slab pull ; Tibetan Plateau ; Geochronology ; Cimmerian ; geochronology ; geodynamics ; Gondwana ; large igneous province ; mantle plume ; Permian ; petrology ; slab ; Tethys
English Abstract: Northward drift of the Cimmerian microcontinents and opening of the Neo-Tethys Ocean in Early Permian are prominent events in northern Gondwana's protracted breakup history. However, the geodynamic setting responsible for these events is controversial. The dispersal of the eastern Cimmerian microcontinents was accompanied by the emplacement of Qiangtang-Panjal large igneous province (QP-LIP). Previously published zircon U-Pb data imply the QP-LIP was emplaced over a long interval (320-280 Ma) but are inconsistent with the short eruption interval constrained by biostratigraphic studies. New secondary ion mass spectrometry (SIMS) zircon U-Pb ages from 15 mafic dikes and gabbroic intrusions from the Southern Qiangtang terrane as well as age data from other parts of the QP-LIP show a much shorter duration (∼290−285 Ma) for this LIP. The QP-LIP was characterized by an initial ∼290 Ma alkalic and tholeiitic phases and a subsequent ∼285 Ma tholeiitic phase, in agreement with regional biostratigraphic data constraining the timing of departure of the eastern Cimmerian microcontinents from Gondwana at ∼285 Ma and the opening of the Neo-Tethys Ocean. The QP-LIP was most likely the consequence of the arrival in the upper mantle of a mantle plume beneath the northern Gondwanan margin. This event, in combination with slab pull associated with subduction beneath Laurasia, may have caused extension and rifting of east Cimmerian continental fragments from the northern margin of Gondwana. This study may elucidate the mechanism responsible for repeated episodes of one-way northward drifting terranes from northern Gondwana that commenced in Paleozoic. © 2021 Elsevier B.V.
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 10049, China; Department of Earth Sciences, St Francis Xavier University, PO Box 5000, Antigonish, NS B2G 2W5, Canada; Earth Dynamics Research Group, The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin UniversityWA 6845, Australia; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, United States; School of Earth Science, Guilin University of Technology, Guilin, 541004, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China

Recommended Citation:
Dan W.,Wang Q.,Murphy J.B.,et al. Short duration of Early Permian Qiangtang-Panjal large igneous province: Implications for origin of the Neo-Tethys Ocean[J]. Earth and Planetary Science Letters,2021-01-01,568
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