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Crustal stabilization:Evidence from the geochemistry and U–Pb detrital zircon geochronology of quartzites from Simlipal Complex,singhbhum craton,India

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Geoscience Frontiers 2022年第1期13卷 46-61页

作者： C.S.Sindhuja Arijit Pahari C.Manikyamba M.Santosh Li Tang Jyotisankar Ray K.S.V.Subramanyam Madhuparna Paul I.Gonzalez-Alvarez P.C.Sruthi CSIR(Council of Scientific and Industrial Research)-National Geophysical Research Institute(NGRI) Uppal RoadHyderabad 500007India School of Earth Science and Resources China University of GeosciencesBeijing 100083China Department of Geology University of CalcuttaKolkataIndia CSIRO Mineral ResourcesWestern AustraliaAustralia

cratonic stabilization was a critical crustal process during the Hadean to Archean for the formation of *** understanding of how and where this process took place is significant to evaluate the architecture of *** singhbhum craton of eastern India has well preserved Precambrian volcanosedimentary *** Simlipal volcano-sedimentary complex of singhbhum craton consists of circular bands of mafic volcanic rocks interlayered with quartzites/shales/*** the present study,we report petrographic and geochemical characteristics of quartzites from Simlipal Complex coupled with U–Pb ages of detrital zircons and zircon geochemistry to understand the provenance and depositional conditions and its connection with the crustal stabilization in the singhbhum *** quartzites are texturally mature with sub-angular to sub-rounded quartz grains followed by feldspars embedded in a silty *** on modal compositions and major element ratios,these quartzites are categorized as quartz arenite and sub-lithic *** element abundances normalized to Archean Upper Continental Crust(AUCC)display positive anomalies at U,Zr,Hf and negative anomalies at *** patterns are characterized by negative Eu anomalies(Eu/Eu^(*)=0.47–0.97)and flat HREE suggesting felsic *** quartzites show depletion of LILE,enrichment of HFSE and transition metals relative to *** weathering indices such as CIA,PIA,and ICV are suggestive of moderate to intense chemical *** trace element ratios such as Th/Cr,Th/Sc,La/Sc,La/Co and Th/Co indicate a predominantly felsic source for these *** overall geochemical signatures indicate passive margin deposition for these *** zircons from the Simlipal quartzites yield U–Pb ages 3156±31 Ma suggesting Mesoarchean crustal *** trace element geochemistry of detrital zircons suggests that the zircons are magmatic in origin and possibly derived from the 3.1 Ga anorogenic grani

关键词： Quartzites Simlipal Complex singhbhum craton U-Pb geochronology Crustal stablilization

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Mafic dykes swarms from the Chhotanagpur Gneiess Complex, singhbhum craton, eastern India

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 92-页

作者： Anup K.Sinha Rajesh K.Srivastava Dr K.S.Krishnan Geomagnetic Research Laboratory Indian Institute of GeomagnetismChamanganj Bazar Centre of Advanced Study Institute of Science Banaras Hindu University

The singhbhum craton of the eastern Indian shield consists of two major crustal provinces viz.,Chotanagpur Gneissic Complex(CGC)and singhbhum Granite Complex;separated by a singhbhum Mobile ***

关键词： eastern India CGC Mafic dykes swarms from the Chhotanagpur Gneiess Complex singhbhum craton

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The response of stromatolites to seismic shocks： Tomboliths from the Palaeoproterozoic Chaibasa Formation, E India

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Journal of Palaeogeography 2016年第4期5卷 381-390页

作者： A.J. (Tom) van Loon Rajat Mazumder Shuvabrata De Geocom Consultants Valle del Portet 17 03762 Benitachell Spain Department of Applied Geology Faculty of Science and Engineering Curtin University Sarawak CDT 250 98009 Miri Sarawak Malaysia Indian Institute of Science Education and Research Department of Earth and Environmental Sciences Bhopal By-pass Road Bhopal 462066 Madhya Pradesh India

It is demonstrated here for the first time how Palaeoproterozoic stromatolites survived seismic disturbance of their substrate. The stromatolites under study could have been cyanobacteria or any other photo-autotrophic microbes, which formed mats that covered a substrate of very fine-grained sandstones and mudstones of the Chaibasa Fm. in eastern India. The sediments represent a shelf environment. The local abundance of the stromatotites suggests that the tow-energy environment formed a suitable habitat. The common phases of tectonic quiescence were, however, occasionally interrupted by seismic shocks. These were sufficiently strong to deform the mat layers, the tower parts of which might already have been （semi-） consolidated. The mats became partly folded, partly faulted, and already consolidated parts of the stromatotite layers broke off. This can be deduced from the angular shapes of part of the broken-off fragments. It appears, however, that part of these fragments were stilt sufficiently soft to become rounded and deformed by rotting over the seafloor, probably under the influence of tidal currents. When come to rest, these fragments served as a new substrate for new generations of the microorganisms. These micro-organisms thus survived by continued growth on the reworked fragments and built up new stromatolites that may show an ‘angular disconformity＇ with the stromatotites of their substrate. It thus is shown that stromatotites have an adequate response to a sudden disturbance of their habitat, and that they survive earthquakes by colonization of broken-off fragments. We call the ‘healed＇ fragments ‘tombotiths＇（tumbled stones）.

关键词： Stromatolites Seismic shocks Soft-sediment deformation structures Pataeoproterozoic singhbhum craton Tombotiths India

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