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Oxygen Isotope Studies on the Origin of Dolomites

Epstein, Samuel and Graf, Donald L. and Degens, Egon T. (1964) Oxygen Isotope Studies on the Origin of Dolomites. In: Isotopic and Cosmic Chemistry. North Holland , Amsterdam, pp. 169-180. http://resolver.caltech.edu/CaltechAUTHORS:20160125-155025932

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Abstract

Oxygen isotope measurements were made on coexisting dolomite and calcite pairs both from recent sedimentary deposits and from high temperature laboratory syntheses. In the limited number of synthetic carbonate samples thus far available, it appears that there is an oxygen isotope fractionation between dolomite and calcite, similar to that found in naturally occurring hydrothermal calcite-dolomite pairs. There is a lack of such fractionation between dolomite and calcite in young sedimentary deposits. It is therefore concluded that dolomite is a secondary product resulting from addition of magnesium to existing crystalline CaCO_3, which takes place without an isotopic change in the oxygen of the precursor CaCO_3. It is also shown that the O^(18)/O^(16) ratio of dolomite is less susceptible to diagenetic reequilibration with surrounding fluids than is that of calcite.


Item Type:Book Section
Additional Information:© 1964 North-Holland Publishing Company. California Institute of Technology, Contribution No. 1168. Most of the experimental runs cited in this paper were made at Dunbar Laboratory, Harvard University in 1962 and 1963 during the tenure of a Research Fellowship extended to D. L. Graf by the Committee on Experimental Geology and Geophysics. We are grateful to H.C.W. Skinner, H.J. Bissel, G.V. Chilingar, W. Taft and H.A. Lowenstam for contributing the critical sample materials. The financial aid of the American Chemical Society and Atomic Energy Commission (Contract No. AT(04-3)-427) is gratefully acknowledged.
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American Chemical SocietyUNSPECIFIED
Atomic Energy CommissionAT(04-3)-427
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Caltech Division of Geological Sciences1168
Record Number:CaltechAUTHORS:20160125-155025932
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160125-155025932
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63949
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jan 2016 18:50
Last Modified:29 Apr 2019 21:28

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