Neoproterozoic Overprinting on the Archean Western Dharwar Craton, Southern India: Records from LA-ICP-MS U-Pb Geochronology of Rutile and Monazite
Yuhua H.U. Zhao Y. Junsheng L.U. Gou L. George P.M. Wenhao A.O. Zhang C. Zhai M.
February 2026John Wiley and Sons Inc
Acta Geologica Sinica (English Edition)
2026#100Issue 182 - 98 pp.
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.
Neoproterozoic , rutile and monazite U-Pb ages , Sargur area , southern India , western Dharwar Craton
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State Key Laboratory of Continental Evolution and Early Life, Department of Geology, Northwest University, Xian, 710069, China
School of Mining and Geosciences, Nazarbayev University, Astana, 010000, Kazakhstan
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
State Key Laboratory of Continental Evolution and Early Life
School of Mining and Geosciences
Key Laboratory of Computational Geodynamics
Key Laboratory of Mineral Resources
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