Age of the Marwar Supergroup,NW India:A note on the U–Pb geochronology of Jodhpur Group felsic volcanics

作     者：Huiru Xu Joseph G.Meert Manoj K.Pandit Huiru Xu;Joseph G.Meert;Manoj K.Pandit

作者机构：Hubei Subsurface Multi-scale Imaging Key LaboratoryInstitute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Department of Earth and Planetary SciencesUniversity of FloridaGainesvilleFL 32611United States Department of GeologyUniversity of RajasthanJaipur 302004India 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第1期

页      面：244-254页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：JGM by the US National Science Foundation Grant EAR09-10888 HRX by the National Natural Science Foundation of China Grant 41974078 

主　　题：Marwar Supergroup Sedimentation age Zircon U-Pb dating Chhoti Khatu felsic volcanics 

摘      要：The Marwar Supergroup(NW Peninsular India)is thought to be of Ediacaran-Cambrian age,based on previous paleontological and geochronological ***,direct constraints on the onset of sedimentation within the Marwar basin are still *** this study,we report U–Pb zircon,LA-ICP-MS,and SIMS ages from the Chhoti Khatu felsic volcanic rocks,interlayered with the Jodhpur Group sandstones(Lower Marwar Supergroup).The cathodoluminescence images of the zircons indicate complex morphologies,and core-rim textures coupled with the wide range of ages indicate that they are likely inherited or in the case of thin poorly indurated ash-beds,detrital in *** age spectra of 68 zircon analyses from our sampling display a dominant 800–900 Ma age peak corresponding to the age of basementErinpura graniterocks in the *** youngest inherited zircon from a felsic ash layer yielded a U–Pb age of651 Ma±18 Ma that,together with previous studies and paleontological evidence,indicates a postCryogenian age for the initiation of Marwar sedimentation following a~125 Ma hiatus between the end of Malani magmatism and Marwar deposition.