气候变化领域集成服务门户(CCPortal): Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India

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DOI	10.1130/B35027.1
	Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India
	Wang W.; Cawood P.A.; Pandit M.K.; Zhou M.-F.; Zhao J.-H.
发表日期	2018
ISSN	167606
起始页码	426
结束页码	443
卷号	131 期号:2021-03-04
英文摘要	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. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185059
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC 3800, Australia; Department of Earth Sciences, The University of Hong Kong SAR, Hong Kong; Department of Geology, University of Rajasthan, Jaipur, 302004, India
推荐引用方式 GB/T 7714	Wang W.,Cawood P.A.,Pandit M.K.,et al. Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India[J],2018,131(2021-03-04).
APA	Wang W.,Cawood P.A.,Pandit M.K.,Zhou M.-F.,&Zhao J.-H..(2018).Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India.Bulletin of the Geological Society of America,131(2021-03-04).
MLA	Wang W.,et al."Evolving passive- and active-margin tectonics of the Paleoproterozoic Aravalli Basin, NW India".Bulletin of the Geological Society of America 131.2021-03-04(2018).