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Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India

2018; Geological Society of America; Volume: 131; Issue: 3-4 Linguagem: Inglês

10.1130/b35027.1

1943-2674

Wei Wang, Peter A. Cawood, Manoj K. Pandit, Mei-Fu Zhou, Jun-Hong Zhao,

Geochemistry and Geologic Mapping

Research Article| October 11, 2018 Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India Wei Wang; Wei Wang † 1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China2School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia3Department of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China †Corresponding author: wwz@cug.edu.cn Search for other works by this author on: GSW Google Scholar Peter A. Cawood; Peter A. Cawood 2School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia Search for other works by this author on: GSW Google Scholar Manoj K. Pandit; Manoj K. Pandit 4Department of Geology, University of Rajasthan, Jaipur 302004, India Search for other works by this author on: GSW Google Scholar Mei-Fu Zhou; Mei-Fu Zhou 3Department of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China Search for other works by this author on: GSW Google Scholar Jun-Hong Zhao Jun-Hong Zhao 1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China Search for other works by this author on: GSW Google Scholar Author and Article Information Wei Wang † 1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China2School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia3Department of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China Peter A. Cawood 2School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia Manoj K. Pandit 4Department of Geology, University of Rajasthan, Jaipur 302004, India Mei-Fu Zhou 3Department of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China Jun-Hong Zhao 1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China †Corresponding author: wwz@cug.edu.cn Publisher: Geological Society of America Received: 01 May 2018 Accepted: 02 Aug 2018 First Online: 11 Oct 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2019) 131 (3-4): 426–443. https://doi.org/10.1130/B35027.1 Article history Received: 01 May 2018 Accepted: 02 Aug 2018 First Online: 11 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Wei Wang, Peter A. Cawood, Manoj K. Pandit, Mei-Fu Zhou, Jun-Hong Zhao; Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India. GSA Bulletin 2018;; 131 (3-4): 426–443. doi: https://doi.org/10.1130/B35027.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The sedimentary record of the Paleoproterozoic Aravalli Supergroup in northwest India provides evidence for a progression from passive margin to active margin and back to passive margin that can be linked to the Precambrian crustal evolution of peninsular India. U-Pb detrital zircon age data from clastic sedimentary rocks constrain the depositional age of the Aravalli Supergroup to within the ca. 2.4–1.6 Ga age bracket. The 3.3–2.9 and 2.5 Ga basement granitoids of the Banded Gneiss Complex have been identified as the source rocks for the Delwara Formation from the Lower Aravalli Supergroup. The Delwara sandstones show enrichment of Zr and depletion of Ti and Sc, indicating a passive-margin depositional environment. Immature sandstones of the Middle Aravalli Udaipur Formation incorporate detritus from ca. 1.97–1.79 Ga magmatic arc rocks (characterized by zircon εHf[t] values varying from +6.1 to –7.8) and continental basement (ca. 2.5 Ga). Tectonic discrimination characteristics of Middle Aravalli sandstones, such as K2O/Na2O-SiO2, TiO2-Fe2O3, La-Th-Sc, and Th-Sc-Zr/10, suggest a continental arc setting, in agreement with their average modal composition of Q23F27L50 (where Q is quartz, F is feldspar, and L is lithics), which indicates a proximal source and transitional arc setting. The stratigraphically higher Bowa Formation of the Middle Aravalli Supergroup received additional detritus from 1.78 to 1.72 Ga extension-related magmatic arc rocks, and these strata are characterized by zircons with subchondritic εHf(t)values, suggesting a back-arc setting, in agreement with tectonic discrimination plots. The Upper Aravalli Debari sandstones are dominated by 1.87–1.65 Ga detritus. Their high maturity (average: Q92F4L4) and geochemical features are consistent with a passive-margin setting. Integration of the lithostratigraphic relationships and compositional data suggests that the rocks of Aravalli Supergroup archive the record for the development of early Paleoproterozoic passive-margin platform sedimentation, followed by a transition to continental arc and subsequently to an evolved rift-basin–passive-margin setting. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.