U-Pb zircon dating and Sr isotope systematics of the Vindhyan Supergroup, India

Ray, Jyotisankar; Martin, Mark W.; Veizer, Ján; Bowring, Samuel A.

doi:10.1130/0091-7613(2002)030<0131:upzdas>2.0.co;2

Cited by 218 publications

(110 citation statements)

References 19 publications

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“…The lower Vindhyan Semri Group has largely been studied in the Son Valley region where multiple interbedded volcanic tuffs offer robust U-Pb zircon depositional age constraints of ca. 1.6 Ga (Rasmussen et al, 2002;Ray et al, 2002;Bengtson et al, 2009). These ages are broadly consistent with the occurrence of microfossils such as Grypania (Kumar, 1995) which occur globally in strata of similar ages (Adams et al, 2017).…”

Section: Age Of the Chitrakoot Taxamentioning

confidence: 99%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

153

128

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Shale samples were collected from outcrops that lack evidence for secondary mineralization from hydrothermal activity and weathered regions that may have experienced alteration were also avoided. Sample sets comprise several 100-200 g samples excavated 10-30 cm from the outcrop surface to target fresh material. Samples were collected along strike from a narrow stratigraphic range (<10 cm), as well as from a vertical profile (up to 5 m). The most organic-rich and least visibly-weathered samples were then chosen for digestion and isotopic

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Section: Age Of the Chitrakoot Taxamentioning

confidence: 99%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

153

128

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“…' The next two older macrofossils have been purported to preserve the trails of motile, multicellular organisms and are more contentious than the younger taxa outlined above. The first, in the Chorhat sandstone of the lowermost Vindhyan basin in India (Seilacher et al 1998) attains Palaeoproterozoic antiquity on the merits of two concurrent and independent high-precision U -Pb studies (Rasmussen et al 2002b;Ray et al 2002). However, Seilacher (2007) has subsequently introduced a viable alternative hypothesis that the Chorhat traces could represent (biogenic?)…”

Section: The Evolving Palaeoclimate and Biospherementioning

confidence: 99%

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Reddy

Evans

2009

113

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The Palaeoproterozoic era was a time of profound change in Earth evolution and represented perhaps the first supercontinent cycle, from the amalgamation and dispersal of a possible Neoarchaean supercontinent to the formation of the 1.9-1.8 Ga supercontinent Nuna. This supercontinent cycle, although currently lacking in palaeogeographic detail, can in principle provide a contextual framework to investigate the relationships between deep-Earth and surface processes. In this article, we graphically summarize secular evolution from the Earth's core to its atmosphere, from the Neoarchaean to the Mesoproterozoic eras (specifically 3.0-1.2 Ga), to reveal intriguing temporal relationships across the various 'spheres' of the Earth system. At the broadest level our compilation confirms an important deep-Earth event at c. 2.7 Ga that is manifested in an abrupt increase in geodynamo palaeointensity, a peak in the global record of large igneous provinces, and a broad maximum in several mantle-depletion proxies. Temporal coincidence with juvenile continental crust production and orogenic gold, massive-sulphide and porphyry copper deposits, indicate enhanced mantle convection linked to a series of mantle plumes and/or slab avalanches. The subsequent stabilization of cratonic lithosphere, the possible development of Earth's first supercontinent and the emergence of the continents led to a changing surface environment in which voluminous banded iron-formations could accumulate on the continental margins and photosynthetic life could flourish. This in turn led to irreversible atmospheric oxidation at 2.4-2.3 Ga, extreme events in global carbon cycling, and the possible dissipation of a former methane greenhouse atmosphere that resulted in extensive Palaeoproterozoic ice ages. Following the great oxidation event, shallow marine sulphate levels rose, sediment-hosted and iron-oxide-rich metal deposits became abundant, and the transition to sulphide-stratified oceans provided the environment for early eukaryotic evolution. Recent advances in the geochronology of the global stratigraphic record have made these inferences possible. Frontiers for future research include more refined modelling of Earth's thermal and geodynamic evolution, palaeomagnetic studies of geodynamo intensity and continental motions, further geochronology and tectonic syntheses at regional levels, development of new isotopic systems to constrain geochemical cycles, and continued innovation in the search for records of early life in relation to changing palaeoenvironments.

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“…The Kajrahat Limestone gradationally passes upward to the Porcellanite Formation which is volcaniclastic in nature (Roy and Banerjee, 2002). Rasmussen et al (2002) and Ray et al (2002) determined the age of the Porcellanite Formation to be 1630 Ma by the U/Pb SHRIMP dating technique. Recently, Sarangi et al (2004) obtained an age of 1600 Ma for the Rohtas Limestone (topmost formation of the Semri Group) in the Semri Group.…”

Section: Geological Backgroundmentioning

confidence: 99%

Carbon and oxygen isotopic variations in peritidal stromatolite cycles, Paleoproterozoic Kajrahat Limestone, Vindhyan basin of central India

Banerjee

Bhattacharya

Sarkar

2007

Journal of Asian Earth Sciences

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U-Pb zircon dating and Sr isotope systematics of the Vindhyan Supergroup, India

Cited by 218 publications

References 19 publications

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Carbon and oxygen isotopic variations in peritidal stromatolite cycles, Paleoproterozoic Kajrahat Limestone, Vindhyan basin of central India

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