C, O, Sr and Pb isotope systematics of carbonate sequences of the Vindhyan Supergroup, India: age, diagenesis, correlations and implications for global events

Ray, Jyotisankar; Veizer, Ján; Davis, W J

doi:10.1016/s0301-9268(02)00223-1

Cited by 183 publications

(152 citation statements)

References 51 publications

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“…13 C values of the present study match the 'primary' or least-altered isotope values provided by Ray et al (2003). The regular and systematic shifts in isotope ratios in the peritidal stromatolite cycles cannot be attributed to ocean water turnover, diVerences in productivity or changes in the burial rate of organic carbon.…”

Section: Interpretation Of the Isotopic Datasupporting

confidence: 83%

“…Based on these dates, the Kajrahat Limestone seems to be older than 1630 Ma. On the basis of measured 87 Sr/ 86 Sr ratios it is considered to be about 1700 Ma old (Ray et al, 2003).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Stable isotope analyses of these limestones provided valuable information regarding Proterozoic ocean compositions and evolution of the Precambrian hydrosphere, atmosphere and biosphere (Sarkar et al, 1998;Kumar et al, 2002;Ray et al, 2003). They also provide clues regarding the depositional and diagenetic setting of the Vindhyan carbonates (Banerjee, 1997;Sarkar et al, 1998;Chakraborty et al, 2002;Chakraborty, 2004;.…”

Section: Introductionmentioning

confidence: 99%

“…Friedman et al, 1996Friedman et al, , 2004. Kumar et al (2002) and Ray et al (2003) presented carbon, oxygen and Sr isotope systematics of the Vindhyan carbonates and discussed their implications in relation to secular variation of these isotopes in Precambrian seawater. These studies presented the C-isotope stratigraphy of the Vindhyan Supergroup as a whole and attempted to provide the diagenetically least-altered isotope values.…”

Section: Introductionmentioning

confidence: 99%

“…These studies presented the C-isotope stratigraphy of the Vindhyan Supergroup as a whole and attempted to provide the diagenetically least-altered isotope values. Ray et al (2003) considered that 13 C in the range of 0 § 2‰ represent 'primary values' of Paleoproterozoic to Mesoproterozoic carbonates. However, these workers neglected the inXuence of sedimentary facies and overlooked the existence of stromatolite cyclicity within the upper division of the Kajrahat Limestone that can be a potential cause of isotopic variations.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Interpretation Of the Isotopic Datasupporting

confidence: 83%

“…Based on these dates, the Kajrahat Limestone seems to be older than 1630 Ma. On the basis of measured 87 Sr/ 86 Sr ratios it is considered to be about 1700 Ma old (Ray et al, 2003).…”

Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Chronochemostratigraphy of Platform Sequences Across the Paleoproterozoic‐Mesoproterozoic Transition

Chemale

Guadagnin

2018

Chemostratigraphy Across Major Chronological Boundaries

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C–O isotope geochemistry of the Dashiqiao magnesite belt, North China Craton: implications for the Great Oxidation Event and ore genesis

et al. 2013

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The worldwide 2.33−2.06 Ga unique positive δ13Ccarb excursion has been correlated with the Great Oxidation Event (GOE). The Dashiqiao Formation in the Liaohe Group of the northeastern North China Craton formed at 2.2−2.174 Ga and hosts one of the world‐class magnesite deposits. Here we present major element and C and O isotope analyses of 22 samples from the Dashiqiao Formation and use the data to evaluate the impact of the GOE in the North China Craton, as well as the genesis of the Dashiqiao giant magnesite deposits. Six dolomitic marble samples from a ~600 m thick interval with 1.10 ± 0.04 of MgO/CaO (mol) ratios show higher δ13CPDB values of 0.6−1.4‰ (average 1.2 ± 0.3‰) than those of normal marine carbonates over the globe. However, they display lower δ18OSMOW of 16.4−19.5‰ (average 18.2 ± 1.1‰) as compared to their contemporaneous counterparts, suggesting that the primary carbonates in the Dashiqiao Formation should possess a positive δ13C anomaly (possibly 4.2‰) reflecting the impact of the GOE, and that the δ13C and δ18O values have been depleted in post‐sedimentation diagenesis and/or regional metamorphism. The >550 m thick magnesite layer in the studied section has MgO/CaO ratios ranging from 4.45−200.00. These rocks show δ13C and δ18O values of 0.1−0.9‰ and 9.2−16.9‰, with average values of 0.4 ± 0.2‰ and 13.3 ± 2.5‰, respectively, obviously lower than those of the underlying dolomites. The depletions of 13C and 18O in magnesites relative to dolomitic marbles are interpreted to be the result of hydrothermal alteration related to regional metamorphism leading to rock recrystallization and mass exchange. This interpretation is further confirmed from the hanging‐wall dolomitic marble and the veinlet‐filled magnesite from the ore layer. The former contains mega‐crystals of cylindrical talc and has δ13C of −2.6‰ and δ18O of 14.1‰, indicating that a local fluid–rock interaction between (argillaceous) dolomite and (siliceous) hydrothermal fluids poor in 13C and 18O resulted in the formation of talc and further depletion both in δ13C and in δ18O. The veinlet‐filled magnesite yields δ13C and δ18O values of −2.7‰ and 16.2‰, respectively, showing lower δ13C but higher δ18O than those of massive magnesite in the adjacent strata. Our observation thus strongly supports the interpretation that the massive magnesite interacted with low‐δ13C fluids which were possibly sourced from meteoric water at low temperature during post‐ore time. Thus, the formation of the Dashiqiao magnesite deposits involved primary sedimentation, diagenesis, regional metamorphism, hydrothermal replacement and local post‐ore fluid–rock interaction. Copyright © 2013 John Wiley & Sons, Ltd.

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C, O, Sr and Pb isotope systematics of carbonate sequences of the Vindhyan Supergroup, India: age, diagenesis, correlations and implications for global events

Cited by 183 publications

References 51 publications

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

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

Chronochemostratigraphy of Platform Sequences Across the Paleoproterozoic‐Mesoproterozoic Transition

C–O isotope geochemistry of the Dashiqiao magnesite belt, North China Craton: implications for the Great Oxidation Event and ore genesis

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