典型文献
Age of the Marwar Supergroup,NW India:A note on the U-Pb geochronology of Jodhpur Group felsic volcanics
文献摘要：
The Marwar Supergroup (NW Peninsular India) is thought to be of Ediacaran-Cambrian age,based on pre-vious paleontological and geochronological studies.However,direct constraints on the onset of sedimen-tation within the Marwar basin are still scarce.In 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 origin.The age spectra of 68 zircon analyses from our sampling display a dominant 800-900 Ma age peak corresponding to the age of basement "Erinpura granite" rocks in the region.The youngest inherited zircon from a felsic ash layer yielded a U-Pb age of 651 Ma ± 18 Ma that,together with previous studies and paleontological evidence,indicates a post-Cryogenian age for the initiation of Marwar sedimentation following a ～125 Ma hiatus between the end of Malani magmatism and Marwar deposition.
文献关键词：
中图分类号：
作者姓名：
Huiru Xu;Joseph G.Meert;Manoj K.Pandit
作者机构：
Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China;Department of Earth and Planetary Sciences,University of Florida,Gainesville,FL 32611,United States;Department of Geology,University of Rajasthan,Jaipur 302004,India
文献出处：
引用格式：
[1]Huiru Xu;Joseph G.Meert;Manoj K.Pandit-.Age of the Marwar Supergroup,NW India:A note on the U-Pb geochronology of Jodhpur Group felsic volcanics)[J].地学前缘（英文版）,2022(01):244-254
A类：
Marwar,Supergroup,Jodhpur,volcanics,Chhoti,Khatu,indurated,Erinpura,Cryogenian,Malani
B类：
Age,NW,India,note,Pb,geochronology,Group,felsic,Peninsular,thought,Ediacaran,Cambrian,paleontological,geochronological,studies,However,direct,constraints,onset,within,basin,are,still,scarce,this,study,report,LA,ICP,SIMS,from,rocks,interlayered,sandstones,Lower,cathodoluminescence,images,zircons,complex,morphologies,core,rim,textures,coupled,wide,range,that,they,likely,inherited,case,poorly,ash,beds,detrital,origin,spectra,analyses,our,sampling,display,dominant,peak,corresponding,basement,granite,region,youngest,yielded,together,previous,evidence,indicates,post,initiation,sedimentation,following,hiatus,between,end,magmatism,deposition
AB值：
0.467243
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