Reassessment of petrogenesis of Carboniferous-Early Permian rift-related volcanic rocks in the Chinese Tianshan and its neighboring areas |
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| Authors: | Linqi Xia Xueyi Xu Xiangmin Li Zhongping Ma Zuchun Xia |
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| Institution: | Xi'an Institute of Geology and Mineral Resources, China Geological Survey, Xi'an, Shaanxi 710054, China |
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| Abstract: | The Carboniferous Early Permian rill-related volcanic successions.covering large areas in the Chinese Tianshan and its adjacent areas.make up a newly recognized important Phanerozoic large igneous province in the world.which can be further divided into two sub-provinces:Tianshan and Tarim. The regional unconformity of Lower Carboniferous upon basement or pre-Carboniferous rocks.the ages (360—351 Ma) of the youngest ophiolite and the peak of subduction metamorphism of high pressure-low temperature metamorphic belt and the occurrence of Ni-Cu-bearing mafic-ultramatic intrusion with age of—352 Ma and A-type granite with age of～358 Ma reveal that the final closure of the Paleo Asian Ocean might lake place in the Early Mississippian.Our summation shows that at least four criteria.being normally used to identify ancient asthenosphere upwelling(or mantle plumes),are met for this large igneous province:(1) surface uplift prior to magmatism:(2) being associated with continental ifting and breakup events:(3) chemical characteristics of asthenosphere(or plume) derived basalts;(4) close links to large-scale minerali/alion and the uncontaminaled basalts,being analogous to those of many "ore-bearing" large igneous provinces.display Sr-Nd isotopic variations between plume and EMI geochemical signatures.These suggest that a Carboniferous asthenosphere upwelling and an Early Permian plume played the central role in the generation of the Tianshan—Tarim(central Asia) large igneous province. |
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| Keywords: | Carboniferous-Early Permian rift-related volcanism Tianshan-Tarim (central Asia) large igneous province Asthenosphere Mantle plume Lithosphere contamination |
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