Phanerozoic magmatism in the Proterozoic Cuddapah Basin and its connection with the Pangean supercontinent  

作　　者：Th.Dhanakumar Singh C.Manikyamba Li Tang Sohini Ganguly M.Santosh K.S.V.Subramanyam Arubam C.Khelen 

机构地区：[1]CSIR-National Geophysical Research Institute(Council of Scientific and Industrial Research),Uppal Road,Hyderabad 500007,India [2]School of Earth Sciences and Resources,China University of Geosciences Beijing,29 Xueyuan Road,Beijing 100083,China [3]Department of Earth Sciences,Goa University,Taleigao Plateau,Goa 403206,India [4]Centre for Tectonics,Exploration and Research,University of Adelaide,Adelaide,SA 5005,Australia [5]Key Lab of Submarine Geosciences and Prospecting Techniques,MOE AND College of Marine Geosciences,Ocean University of China,Qingdao 266100,China

出　　处：《Geoscience Frontiers》2019年第6期2239-2249,共11页地学前缘（英文版）

基　　金：the funds from Ministry of Earth Sciences(No:MoES/PO(Geosci)/8/2014)to NGRI and MLP 6406-28(CM);INSPIRE Faculty Project [IFA14-EAS-25] funded by DST,New Delhi

摘　　要：Magmatic pulses in intraplate sedimentary basins are windows to understand the tectonomagmatic evolution and paleaoposition of the Basin.The present study reports the U-Pb zircon ages of mafic flows from the Cuddapah Basin and link these magmatic events with the Pangean evolution during late Carboniferous-Triassic/Phanerozoic timeframe.Zircon U-Pb geochronology for the basaltic lava flows from Vempalle Formation,Cuddapah Basin suggests two distinct Phanerozoic magmatic events coinciding with the amalgamation and dispersal stages of Pangea at 300 Ma(Late Carboniferous)and 227 Ma(Triassic).Further,these flows are characterized by analogous geochemical and geochronological signatures with Phanerozoic counterparts from Siberian,Panjal Traps,Emeishan and Tarim LIPs possibly suggesting their coeval and cogenetic nature.During the Phanerozoic Eon,the Indian subcontinent including the Cuddapah Basin was juxtaposed with the Pangean LIPs which led to the emplacement of these pulses of magmatism in the Basin coinciding with the assemblage of Pangea and its subsequent breakup between 400 Ma and 200 Ma.Magmatic pulses in intraplate sedimentary basins are windows to understand the tectonomagmatic evolution and paleaoposition of the Basin.The present study reports the U-Pb zircon ages of mafic flows from the Cuddapah Basin and link these magmatic events with the Pangean evolution during late Carboniferous-Triassic/Phanerozoic timeframe.Zircon U-Pb geochronology for the basaltic lava flows from Vempalle Formation,Cuddapah Basin suggests two distinct Phanerozoic magmatic events coinciding with the amalgamation and dispersal stages of Pangea at 300 Ma(Late Carboniferous) and 227 Ma(Triassic).Further,these flows are characterized by analogous geochemical and geochronological signatures with Phanerozoic counterparts from Siberian,Panjal Traps,Emeishan and Tarim LIPs possibly suggesting their coeval and cogenetic nature.During the Phanerozoic Eon,the Indian subcontinent including the Cuddapah Basin was juxtaposed with the Pangean LIPs which led to the emplacement of these pulses of magmatism in the Basin coinciding with the assemblage of Pangea and its subsequent breakup between 400 Ma and 200 Ma.

关 键 词：Cuddapah Basin MAFIC flows Zircon U-Pb geochronology PHANEROZOIC MAGMATISM PANGEA SUPERCONTINENT 

分 类 号：P54[天文地球—构造地质学]