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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


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1945-3027
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Volume 97, Issue 10

Issues

MSA Roebling medal lecture. Mineralogy, petrology, U-Pb geochronology, and geologic evolution of the Dabie-Sulu classic ultrahigh-pressure metamorphic terrane, East-Central China

Juhn G. Liou
  • Corresponding author
  • Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94306, U.S.A
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/ Ruyuan Zhang
  • Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94306, U.S.A
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/ Fulai Liu
  • Institute of Geology, Chinese Academy of Geological Sciences, 26, Baiwanzhuang Road, Beijing 100037, China
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/ Zeming Zhang
  • Institute of Geology, Chinese Academy of Geological Sciences, 26, Baiwanzhuang Road, Beijing 100037, China
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/ W. Gary Ernst
  • Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94306, U.S.A
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Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2012.4169

Abstract

The Dabie-Sulu Triassic collisional orogen in eastern Asia was created by northward subduction of the Yangtze continental-crust capped plate beneath the Sino-Korean craton. Eclogites, garnet peridotites, and surrounding country rock gneisses and marbles were all subjected to in situ UHP metamorphism, as indicated by the presence of rare but widespread coesite inclusions in eclogitic minerals and in zircon crystals in the country rocks, as well as by virtually identical metamorphic ages of various UHP rock types. Metamorphic P-T estimates, combined with investigations of mineral exsolution textures and high-P polymorphs, indicate that recovered depths of continental subduction may have exceeded 200 km. Parageneses of mineral inclusions in zoned zircon domains combined with U-Pb ages delineate a well-constrained P-T-time path, suggesting exhumation rates of 5-10 km/Myr. A similar P-T-time trajectory has been established for the microdiamond-bearing Kokchetav Massif. Thus far, however, diamond inclusions have not been confirmed from coesite-bearing zircon domains of Dabie-Sulu UHP rocks despite numerous detailed studies. Oxygen isotopes of minerals from many outcrop samples and the Chinese Continental Scientific Drilling (CCSD) project main hole cores indicate that δ18O depletion took place in a volume of Proterozoic protoliths exceeding 100 000 km3 along the northern edge of the Yangtze craton. Evidently, passive-margin sediments and bimodal igneous rocks that had formed during rifting and breakup of the supercontinent Rodinia were subjected to extensive meteoric waterrock interactions attending terminal Neoproterozoic Snowball Earth conditions. Such hydrothermal alteration volatilized and depleted C from the relatively oxidized protoliths, accounting for the rare occurrences of graphite and apparent lack of microdiamond in Dabie-Sulu UHP rocks.

Keywords : UHP metamorpism; Dabie-Sulu; coesite; zircon; P-T-time path; fluid-rock interactions

About the article

Received: 2012-03-12

Accepted: 2012-06-08

Published Online: 2015-04-02

Published in Print: 2012-10-01


Citation Information: American Mineralogist, Volume 97, Issue 10, Pages 1533–1543, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2012.4169.

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© 2015 by Walter de Gruyter Berlin/Boston.Get Permission

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