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Oxygen and carbon isotope composition from the UHP Shuanghe marbles, Dabie Mountains, China

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Abstract

Investigations on the oxygen and carbon isotope compositions from the ultrahigh-pressure (UHP)-metamorphosed Shuanghe marbles, that occur as a member of a UHP slab, show that the δ18 O values range from +11.1% to+20.5% SMOW, and δ13 C from+1.0% to+5.7% PDB, respectively. The variations in isotope compositions show a centimeter scale of homogeneity and a heterogeneity of regional scale larger than 1 meter.

In contrast to the eclogite marbles from Norway, the Shuanghe marbles have inherited the carbon isotope compositions from their sedimentary precursor. The δ13C shows positive correlation to the content of dolomite. The depletion in18O, compared with the pmtolithic carbonate strata, might result from three possible geological processes: 1) exchanging oxygen isotope with meteoric water before the UHP metamorphism, 2) decarbonation during the UHP metamorphism, and 3) exchanging oxygen isotope with country gneiss at local scale during retrograde metamorphism.

It seems that the advection of fluid in the orogenic belt was very limited during subduction and exhumation of UHP rocks.

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Authors and Affiliations

  1. Laboratory of Lithosphere Tectonic Evolution, Institute of Geology, Chinese Academy of Sciences, 100029, Beijing, China

    Qingchen Wang

  2. Geophysical Laboratory, Carnegie Institution of Washington, 5241 Broad Road N. W., 20015-1305, Washington DC, USA

    Douglas Rumble

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  1. Qingchen Wang
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  2. Douglas Rumble
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Additional information

Project supported by a U. S. -China cooperative project led by Prof. Cong Bolin of the Institute of Geology. Chinese Acade-my of Sciences, and Prof. J. G. Liou of the Department of Geological and Environmental Sciences, Stanford University and by the National Natural Science Foundation of china (Grant No. 49794042). Chinese Academy of Sciences (Grant No. KZ951-A1-401r, and National Science Foundation (Grant No. EAR-95-26700).

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Wang, Q., Rumble, D. Oxygen and carbon isotope composition from the UHP Shuanghe marbles, Dabie Mountains, China. Sci. China Ser. D-Earth Sci. 42, 88–96 (1999). https://doi.org/10.1007/BF02878502

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  • DOI: https://doi.org/10.1007/BF02878502

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