Monazite CHIME/EPMA dating of Erinpura granitoid deformation: Implications for Neoproterozoic tectono-thermal evolution of NW India |
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| Authors: | Jana Just Bernhard Schulz Helga de Wall Fred Jourdan Manoj K Pandit |
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| Institution: | 1. Geozentrum Nordbayern, Schloßgarten 5, D-91054 Erlangen, Germany;2. Institut für Mineralogie der TU Bergakademie, Freiberg/Saxony, Germany;3. Western Australian Argon Isotope Facility, Department of Applied Geology and JdL-CMS, Curtin University of Technology, G.P.O. Box U1987, Perth, WA 6845, Australia;4. Department of Geology, University of Rajasthan, Jaipur-302004, India;1. Department of Geology, Presidency University, Kolkata 700073, India;2. Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 7398526, Japan;3. Hiroshima Institute of Plate Convergence Regions Research (HiPeR), Hiroshima University, 7398526, Japan;1. Department of Geological Sciences, Indiana University, 1001 East 10th Street, Bloomington, IN 47405, USA;2. Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, NY 13244, USA;1. National Disaster Management Authority, A-1, Safdarjung Enclave, New Delhi, India;2. Department of Interdisciplinary Science, Faculty of Science, Kochi University, Akebono-cho, Kochi 780-8520, Japan;3. School of Earth Sciences and Mineral Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;4. Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea;1. Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India;2. Department of Geology, The Maharaja Sayajirao University of Baroda, Vadodara 390002, India;1. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India;2. Atomic Minerals Directorate for Exploration and Research, Shillong 793019, India;3. Atomic Minerals Directorate for Exploration and Research, Jamshedpur 831002, India |
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| Abstract: | The in-situ “chemical” Th–U–Pb dating of monazite with the electron microprobe is used to unravel the Neoproterozoic tectono-thermal history of the “Erinpura Granite” terrane in the foreland of the Delhi Fold Belt (DFB) in the NW Indian craton. These granitoids are variably deformed and show effects of shearing activity. Monazites from the Erinpura granitoids recorded two main events; (1) protolith crystallization at 863 ± 23 Ma and (2) recrystallization and formation of new Th-poor monazite at 775 ± 26 Ma during shear overprint. Some components of the Erinpura granitoids, such as the Siyawa Granite and granites exposed near Sirohi town, show evidence of migmatization. This migmatization event is documented by anatexis and associated monazite crystallization at 779 ± 16 Ma. The age data indicate an overlap in timing between anatectic event and ductile shear deformation. The end of the tectono-thermal event in the Sirohi area is constrained by a 736 ± 6 Ma Ar–Ar muscovite age data from the ductile shear zone. |
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