Geochemical preservation potential of high-grade calcite marble versus dolomite marble: implication for isotope chemostratigraphy

Melezhik, Victor A.; Roberts, David L.; Fallick, Anthony E.; Горохов, И. М.; Kusnetzov, A.B.

doi:10.1016/j.chemgeo.2004.11.020

Cited by 56 publications

(32 citation statements)

References 48 publications

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“…This observed geochemical feature is explained by partial re-equilibration of the dolomite in the contact zone with Sr-enriched metamorphic fluids. However, a significant negative Mg/Ca versus Sr correlation observed in the dolomitic marbles outside the contact zones suggests that the elevated Sr concentration is caused by relic inclusions of the primary calcite (Melezhik et al, 2001(Melezhik et al, , 2005.…”

Section: Major and Trace Elements Geochemistrymentioning

confidence: 82%

Petrographical and geochemical investigation of the Triassic marbles associated with Menderes massif metamorphics, Kavaklıdere, Muğla, SW Turkey

Bağcı

Kibici

Yildiz

et al. 2010

Journal of Geochemical Exploration

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Section: Major and Trace Elements Geochemistrymentioning

confidence: 82%

Petrographical and geochemical investigation of the Triassic marbles associated with Menderes massif metamorphics, Kavaklıdere, Muğla, SW Turkey

Bağcı

Kibici

Yildiz

et al. 2010

Journal of Geochemical Exploration

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“…Even in some areas that have experienced amphibolitefacies metamorphism, carbonates may still retain primary C isotope compositions (Melezhik et al, 2005(Melezhik et al, , 2008Petterson et al, 2011). In a number of cases, it appears that Proterozoic C isotope curves are reproducible across multiple continents, an observation that is frequently cited in support of the global ocean hypothesis (e.g., Halverson et al, 2005).…”

Section: Primary Versus Diagenetic Carbon Isotope Valuesmentioning

confidence: 93%

The Shuram and subsequent Ediacaran carbon isotope excursions from southwest Laurentia, and implications for environmental stability during the metazoan radiation

Verdel

Wernicke

Bowring

2011

Geological Society of America Bulletin

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Current understanding of secular changes in the carbon isotopic composition of midto late Ediacaran carbonates suggests a relatively long, steady recovery of the global ocean from the Shuram negative excursion, followed by a smaller negative excursion at the Precambrian-Cambrian boundary. New radiometric, stratigraphic, and carbon isotope data from thick exposures of the upper Johnnie Formation in the Panamint Range of eastern California, combined with data from carbonate-rich facies of the Stirling Quartzite in the Funeral Mountains, confi rm an Ediacaran age for these strata and provide a more complete record of isotopic variations during this time interval than previously determined from SW Laurentia and other key sections around the globe. A siltstone in the lower part of the Johnnie Formation yielded a detrital zircon grain with an age of 640.33 ± 0.09 Ma, lowering the maximum radiometric age constraint on the Johnnie Formation by >400 m.y., consistent with an Ediacaran age based on chemo-and biostratigraphic data. In contrast to previous C isotope compilations from this region, which were generally based on relatively thin portions of the Cordilleran miogeocline near its depositional hinge, the more basinward exposures exhibit a recovery from values near -12‰ to 0‰ within the upper part of the Johnnie Formation. Details in the shape of the chemostratigraphic profi le through the upper Johnnie Formation closely match those in profi les through the Wonoka Formation in South Australia (which lies above the basal Ediacaran global stratotype section and point) and the Shuram-Buah interval in Oman, confi rming temporal correlation and suggesting genesis through changes in the isotopic composition of the global ocean. The Shuram excursion in SW Laurentia is followed by at least three smaller Ediacaran to earliest Cambrian isotopic excursions recorded within, from oldest to youngest, the uppermost Johnnie Formation, the middle Stirling Quartzite, and the lower Wood Canyon Formation. These data indicate that the negative excursion associated with the base of the Cambrian is not a unique postShuram event, and that post-Shuram, preCambrian animal evolution occurred in an environment of repeated large-magnitude fl uctuations in the carbon isotopic composition of the global ocean.

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“…In contrast, other researchers employ dolomites as seawater 87 Sr/ 86 Sr proxies due to the absence of micrites or limestones (e.g., Derry et al, 1992;Gao and Land, 1991;Huang et al, 2002;Semikhatov et al, 2002;Kuznetsov et al, 2003). The 87 Sr/ 86 Sr ratios are important tools to study the origin of dolomite, especially regarding the nature of solutions in which the dolomite is formed (e.g., Compton et al, 2001;Pichler and Humphrey, 2001;Melezhik et al, 2005;Nasir et al, 2008). If dolomites are formed from coeval seawater or seawater-derived solutions, they should record the seawater 87 Sr/ 86 Sr signature, in the absence of radiogenic Sr introduced to the diagenetic environment (Qing et al, 2001).…”

Section: Preservation Of Primary Isotopic Signaturesmentioning

confidence: 99%

Carbon and strontium isotopes and global correlation of Cambrian Series 2-Series 3 carbonate rocks in the Keping area of the northwestern Tarim Basin, NW China

Wang

Yao

et al. 2011

Marine and Petroleum Geology

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Geochemical preservation potential of high-grade calcite marble versus dolomite marble: implication for isotope chemostratigraphy

Cited by 56 publications

References 48 publications

Petrographical and geochemical investigation of the Triassic marbles associated with Menderes massif metamorphics, Kavaklıdere, Muğla, SW Turkey

Petrographical and geochemical investigation of the Triassic marbles associated with Menderes massif metamorphics, Kavaklıdere, Muğla, SW Turkey

The Shuram and subsequent Ediacaran carbon isotope excursions from southwest Laurentia, and implications for environmental stability during the metazoan radiation

Carbon and strontium isotopes and global correlation of Cambrian Series 2-Series 3 carbonate rocks in the Keping area of the northwestern Tarim Basin, NW China

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