Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures

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doi: 10.1016/0016-7037(83)90104-7
Authors:Wada, Hideki; Suzuki, Kazuhiro
Author Affiliations:Primary:
Shizuoka Univ., Inst. Geosci., Fac. Sci., Shizuoka, Japan
Nagoya Univ., Dep. Earth Sci., Chikusa, Nagoya, Japan
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 47(4), p.697-706. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1983
Note:In English
Summary:The T-dependence of carbon isotopic fractionations between calcite and graphite, and between dolomite and graphite are calibrated by the calcite-dolomite solvus geothermometry using marbles collected from the contact metamorphic aureole in the Kasuga area, central Japan. The C-isotopic fractions (DELTA 13CCc-Gr and DELTA 13CDo-Gr) systematically decrease with increasing metamorphic T. The concordant relationships between the fractionations and solvus T are approximately linear with T-2 over the range 400° to 680°C: DELTA 13CCc-Gr(per mille) = 5.6 X 106 X T-2(K) - 2.4; DELTA 13CDo-Gr(per mille) = 5.9 X 106 X T-2(K) - 1.9. These systematic relationships between fractionation and temperature suggest that C-isotopic equilibria between carbonates and graphite were attained in many cases. Because of the relatively high sensitivity of T, these isotopic geothermometers are useful for determining T in moderate- to high-grade metamorphosed carbonate rocks. [C.M.B.H.]
Subjects:Aureoles; C-13/C-12; Calcite; Carbon; Carbonates; Chemical fractionation; Composition; Dolomite; Geochemistry; Geologic thermometry; Graphite; Isotopes; Marbles; Metamorphic rocks; Metamorphism; Mineral assemblages; Native elements; Processes; Stable isotopes; Temperature; Theoretical studies; Fractionation
Abstract Numbers:84M/0639
Record ID:1983039391
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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