Neoproterozoic Overprinting on the Archean Western Dharwar Craton,Southern India:Records from LA-ICP-MS U-Pb Geochronology of Rutile and MonaziteOA
This study provides new evidence for a significant Neoproterozoic tectono-thermal event in the southern Dharwar Craton,based on U-Pb dating of rutile and monazite from metamorphic rocks of the Sargur Group.Trace element analysis of rutile in garnet-bearing amphibolite,amphibolite,garnet-bearing staurolite-kyanite schist,and grunerite-garnet schist suggests that their protoliths were primarily basaltic rocks,sediments with mafic component,pelitic sediments,and mixed sediments with both mafic and felsic components,respectively.Rutile U-Pb ages of 625±22 Ma(garnet-bearing amphibolite),752±5.1 Ma(amphibolite),836±4 Ma to 663±26 Ma(garnet-bearing staurolite kyanite schist)and 860±13 Ma(grunerite-garnet schist),along with a monazite U-Pb age of 789±4.4 Ma(garnet-bearing staurolite kyanite schist),record a significant Neoproterozoic(860-625 Ma)tectono-thermal event along the southern margin of the western Dharwar Craton.This event is most likely associated with aborted rift-related alkaline magmatism along the northern margin of the Southern Granulite Terrane(SGT)and the southern margin of the Dharwar Craton.Given the lack of direct evidence for the assembly of the Rodinia supercontinent in the Dharwar Craton and SGT,this Neoproterozoic event is unlikely to be related to the breakup of Rodinia.
HU Yuhua;ZHAO Yan;LU Junsheng;GOU Longlong;PMGEORGE;AO Wenhao;ZHANG Chengli;ZHAI Mingguo
State Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,China School of Mining and Geosciences,Nazarbayev University,Astana 010000,KazakhstanState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,ChinaState Key Laboratory of Continental Evolution and Early Life,Department of Geology,Northwest University,Xi''an 710069,China Key Laboratory of Computational Geodynamics,University of Chinese Academy of Sciences,Beijing 100049,China Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
天文与地球科学
rutile and monazite U-Pb agesNeoproterozoicSargur areawestern Dharwar Cratonsouthern India
《Acta Geologica Sinica(English Edition)》 2026 (1)
P.82-98,17
supported by the National Natural Science Foundations of China(Grant Nos:41890831 and 42172214)the MOST Special Fund from the State Key Laboratory of Continental Dynamics,Northwest University.
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