Petrogenesis and Rb-Sr Isotopic Characteristics of PaleoMesoproterozoic Mirgarani Granite Sonbhadra Uttar Pradesh India: Geodynamics Implication for Supercontinent Cycle
نویسندگان
چکیده
The Rb-Sr whole-rock isochron, age 1636 ± 66 Ma of Mirgarani granite, is the one oldest granite dated in northwestern part Chhotanagpur Granite Gneiss Complex (CGGC). initial Sr ratio 0.715 0.012 (MSWD = 0.11), showing an S-type affinity. has intruded migmatite complex Dudhi Group and forms formation comparable to granites Bihar Mica Belt around Hazaribagh (1590 30 Ma). present studies have established chronostratigraphy adjoining areas CGGC. Petro graphic geochemical revealed that enriched Rb (271 ppm), Pb (77 Th (25 U (33 ppm) depleted (95 Nb (16 Ba (399 Zr (143 contents as compared normal granite. a peraluminous (A/CNK 1.23), high potassic (K2O 6.42%), Calc-Alkalic Alkali-Calcic {(Na2O+K2O)-CaO 6.29} S-Type feature supported by presence modal garnet normative corundum (2.68%). considered been formed anatexis crustal sedimentary protolith at depth approximately km with temperatures ranging from 685-700 °C during Co lumbian - Nuna Supercontinent.
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ژورنال
عنوان ژورنال: Advances in Geological and Geotechnical Engineering Research
سال: 2023
ISSN: ['2810-9384']
DOI: https://doi.org/10.30564/agger.v5i1.5261