Geochemical and stable isotope signatures of Proterozoic stromatolitic carbonates from the Vempalle and Tadpatri Formations, Cuddapah Supergroup, India: Implications on paleoenvironment and depositional conditions

Khelen, Arubam C.; Manikyamba, C.; Ganguly, Sohini; Singh, Th. Dhanakumar; Subramanyam, K.S.V.; Ahmad, Shamim; Reddy, M. Ramakrishna

doi:10.1016/j.precamres.2017.05.021

Cited by 24 publications

(6 citation statements)

References 99 publications

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“…Despite uncertainties in the depth of the chemocline for much of the literature data, our results suggest that before the Ediacaran (∼635 Ma), atmospheric pO 2 concentrations were close to the oxygen requirements of basal metazoans. Carbonate Ce/Ce* were taken from this study and from the literature where available (3,32,(67)(68)(69)(70)(71). We filtered data using Nd/Nd* anomalies and did not include Ce/Ce* values from samples with Nd/Nd* offsets of >0.1 from 1.0.…”

Section: Discussionmentioning

confidence: 99%

Constraints on Paleoproterozoic atmospheric oxygen levels

Bellefroid

Hood

Hoffman

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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The oxygenation of Earth's surface environment dramatically altered key biological and geochemical cycles and ultimately ushered in the rise of an ecologically diverse biosphere. However, atmospheric oxygen partial pressures (O) estimates for large swaths of the Precambrian remain intensely debated. Here we evaluate and explore the use of carbonate cerium (Ce) anomalies (Ce/Ce*) as a quantitative atmospheric O proxy and provide estimates of Proterozoic O using marine carbonates from a unique Precambrian carbonate succession-the Paleoproterozoic Pethei Group. In contrast to most previous work, we measure Ce/Ce* on marine carbonate precipitates that formed in situ across a depth gradient, building on previous detailed sedimentology and stratigraphy to constrain the paleo-depth of each sample. Measuring Ce/Ce* across a full platform to basin depth gradient, we found only minor depleted Ce anomalies restricted to the platform and upper slope facies. We combine these results with a Ce oxidation model to provide a quantitative constraint on atmospheric O 1.87 billion years ago (Ga). Our results suggest Paleoproterozoic atmospheric oxygen concentrations were low, near 0.1% of the present atmospheric level. This work provides another crucial line of empirical evidence that atmospheric oxygen levels returned to low concentrations following the Lomagundi Event, and remained low enough for large portions of the Proterozoic to have impacted the ecology of the earliest complex organisms.

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Section: Discussionmentioning

confidence: 99%

Constraints on Paleoproterozoic atmospheric oxygen levels

Bellefroid

Hood

Hoffman

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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“…To extract primary oceanic REY signal out of marine sediments, various digestion methods were used in literature (Table 1). A few researchers applied one-step dissolution using concentrated acids including hydrofluoric acid (Bolhar and Van Kranendonk, 2007;Frimmel, 2009;Bodin et al, 2015;Wang et al, 2015;Khelen et al, 2017). After realizing the problem of introducing contaminations, weak acids were widely used in digestion processes (Nothdurft et al, 2004;Allwood et al, 2010;Rongemaille et al, 2011;Ling et al, 2013;Hohl et al, 2015).…”

Section: Extracting Seawater Rey From Carbonate Rocksmentioning

confidence: 99%

What do Ce anomalies in marine carbonates really mean? A perspective from leaching experiments

et al. 2020

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“…The Vempalle stromatolites recorded negative to positive excursion of δ 13 C in which the positive excursion is very significant in contradicting the popular belief of negative δ 13 C signatures during the boring billion (i.e. 1.9-0.9 Ga) whereas the Tadpatri stromatolites recorded the negative δ 13 C following the global geochemical system (Khelen et al, 2017). The authors suggested that the magmatism in the Cuddapah basin has disrupted the biological activity in the Vempalle Formation.…”

Section: Precambrian Biogeochemical Processesmentioning

confidence: 94%

“…The depletion in δ 13 C and δ 18 O isotopic signatures in the stromatolites of Vempalle and Tadpatri Formations reflect on higher temperatures of Proterozoic sea water compared to modern sea water. Based on comprehensive morphological, petrological, whole rock geochemistry, carbon and oxygen isotopic signatures Khelen et al (2017) explained the deposition of Proterozoic Cuddapah stromatolites in anoxic conditions at moderate water depth and shallow shelf environment covering subtidal-intertidal-supratidal zones with fluctuating fluvio-energy conditions. Similar studies on the Neoarchean stromatolitic carbonates of Sandur, Chitradura and Shimoga greenstone belts have provided insights on the Archean sea water conditions and depositional environment.…”

Section: Precambrian Biogeochemical Processesmentioning

confidence: 99%

Annals of Precambrian Lithospheric Evolution and Metallogeny in the Dharwar Craton, India: Recent Paradigms and Perspectives

Manikyamba¹,

Ganguly²

2020

PINSA

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This article brings out a comprehensive overview of the scientific studies that have been executed in different parts of Dharwar Craton during last four years 2016-2020. Recent trends of research and scientific perspectives have emphasized on integrated approaches involving a wide spectrum of geochemical, isotopic and geochronological proxies to address fundamental questions in the Dharwar Craton on Precambrian evolution of the earth, episodes and mechanisms of crust generation and the mantle dynamics. The excellent preservation of Precambrian lithologies including basement gneisses, volcano-sedimentary sequences of greenstone belts, granitoid plutons, ultramafic-mafic complexes, ultrapotassic magmatism and dyke swarms in the Dharwar Craton have provided an opportunity for understanding the geodynamic transitions in the secular evolution of the Earth. A four year status report including the principal lithological associations of Dharwar Craton have been described in this communication detailing the scientific investigations and their implications are brought out under various sections. The salient aspects of the scientific contributions on granite-greenstone terranes of Dharwar Craton emphasising on geochronology, geochemistry, biogeochemical processes, geodynamics and mineralization.

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Geochemical and stable isotope signatures of Proterozoic stromatolitic carbonates from the Vempalle and Tadpatri Formations, Cuddapah Supergroup, India: Implications on paleoenvironment and depositional conditions

Cited by 24 publications

References 99 publications

Constraints on Paleoproterozoic atmospheric oxygen levels

Constraints on Paleoproterozoic atmospheric oxygen levels

What do Ce anomalies in marine carbonates really mean? A perspective from leaching experiments

Annals of Precambrian Lithospheric Evolution and Metallogeny in the Dharwar Craton, India: Recent Paradigms and Perspectives

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