Evidence of Polyphase Deformation in Gneissic Rocks Around Devgadh Bariya: Implications for Evolution of Godhra Granite in the Southern Aravalli Region (India) |
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| Institution: | 1. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, West Bengal, India;2. Department of Geology, M.S. University of Baroda, Vadodara - 390 002, Gujarat, India;1. Research Laboratory of Industrial and Ornamental Rocks (LIRIO), University of Évora, Portugal;2. Earth Sciences Institute (ICT), Pole of the University of Évora, Rua Romão Ramalho, n° 59, 7000-671 Évora, Portugal;3. Gesciences Department, Sciences and Techology School, University of Évora, Portugal;1. Israel Antiquities Authority, POB 180, IL 30300 Atlit, Israel;2. Zinman Institute of Archaeology, University of Haifa, Haifa, IL 31905 Haifa, Israel;3. National Natural History Collections, Faculty of Life Sciences, The Hebrew University, E. Safra Campus, Jerusalem 9190401, Israel;1. Department of Earth and Planetary Science, University of California, Berkeley, 307 McCone Hall #4767, Berkeley, CA 94720-4767, USA;2. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA;1. Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics (Ministry of Education), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China;2. Shandong Huaju Polymer Materials Co.,Ltd., Binzhou 256500, China |
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| Abstract: | In this paper, field evidence documenting the polydeformed nature of banded gneiss that comprises a part of the Godhra Granite and Gneiss in the southern portion of Aravalli Mountain Belt (AMB), India, is presented. The structural geometry involving an episode of recumbent-reclined folding in the gneiss lying in the vicinity of Devgadh Bariya town is worked out. The banded gneiss occurs as enclaves in the granite. Therefore, it is suggested that the banded gneiss of the region is older than Godhra Granite. Microstructures preserved in the granitic rocks are documented and it is suggested that the granitic rocks underwent deformation and strain during their evolutionary history. Variation in the mesoscopic scale fabric of the gneiss and granite along a south-to-north traverse within the study area is documented, and different possibilities for evolution of Godhra Granite are discussed. |
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