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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Putirka, Keith / Swainson, Ian

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1945-3027
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Volume 87, Issue 7

Issues

Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan- Sulu UHP terrane, eastern China

Kai Ye
  • Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
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/ Jing-Bo Liu
  • Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
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/ Bo-Lin Cong
  • Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
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/ Da-Nian Ye
  • Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
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/ Ping Xu
  • Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
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/ Soichi Omori
  • Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152, Japan
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/ Shigenori Maruyama
  • Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152, Japan
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Published Online: 2015-03-28 | DOI: https://doi.org/10.2138/am-2002-0710

Abstract

Titanites previously reported from high-pressure rocks commonly contain high Al and F contents. This finding has led previous workers to conclude that high Al and F in titanite can expand its stability field to high-pressure and ultrahigh-pressure (UHP) conditions. In this study, a coesite inclusion was identified in titanite of aragonite- and jadeite-bearing gneiss from the Dabieshan UHP metamorphic terrane of eastern China. We also found UHP titanite in carbonate-bearing garnet clinopyroxenite from the Sulu UHP terrane. Interestingly, both types of the UHP titanite mentioned above contain low Al and F contents. Therefore, our data indicate that the high-Al and F contents are not necessary criteria for stabilizing titanite to UHP conditions. It is inferred that the UHP titanite formed via the reaction TiO2 + CaCO3 + SiO2 = CaTiSiO5 + CO2, and that the presence of the UHP assemblage aragonite + rutile + clinopyroxene + coesite in the host rock and a very low XCO₂ value in the coexisting fluid are crucial conditions for the formation of these UHP titanites

About the article

Received: 2001-02-26

Accepted: 2001-04-16

Published Online: 2015-03-28

Published in Print: 2002-07-01


Citation Information: American Mineralogist, Volume 87, Issue 7, Pages 875–881, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2002-0710.

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© 2015 by Walter de Gruyter Berlin/Boston.

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