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Journal of Petrology | Volume 43 | Number 8 | Pages 1505-1527 | 2002
© Oxford University Press 2002

Fluid Evolution during HP and UHP Metamorphism in Dabie Shan, China: Constraints from Mineral Chemistry, Fluid Inclusions and Stable Isotopes

YILIN XIAO1, JOCHEN HOEFS1,*, ALFONS M. VAN DEN KERKHOF1, KLAUS SIMON1, JENS FIEBIG1,2 and YONG-FEI ZHENG3

1GÖTTINGEN ZENTRUM GEOWISSENSCHAFTEN, GOLDSCHMIDTSTRASSE, D-37077 GÖTTINGEN, GERMANY
2INSTITUT DE MINÉRALOGIE, BFSH 2, CH-1015 LAUSANNE, SWITZERLAND
3DEPARTMENT OF EARTH AND SPACE SCIENCES, UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA, HEFEI, ANHUI 230026, P.R. CHINA

The Dabie Shan ultrahigh-pressure (UHP) metamorphic terrane is located in the eastern part of the east–west-striking Qinling–Dabie orogenic belt in China. A major mylonitized contact zone of 200–300 m width divides Dabie Shan into the South Dabie Terrane (SDT) and the North Dabie Complex (NDC). Combined investigation of major and trace element geochemistry, fluid inclusions, and oxygen and hydrogen isotopes constrains the fluid history during the metamorphic evolution of the two metamorphic belts, which differ in their fluid and metamorphic evolution. Fluid inclusions in rocks from the SDT are mainly aqueous with varying salinities, whereas those from the NDC are dominated by CO2. Low {delta}18O values in the SDT rocks (-2·8 to 8·6{per thousand}) indicate meteoric water–rock interactions before UHP metamorphism, whereas rocks from the NDC show ‘normal’ {delta}18O values (6·7–9·0{per thousand}) with no obvious meteoric water–rock signature. Whole-rock rare earth element (REE) contents correlate with oxygen isotope compositions: samples from the SDT have higher REE contents and lower {delta}18O values, whereas samples from the NDC have lower REE contents and higher {delta}18O values. During retrograde metamorphism fluids with different hydrogen isotope compositions interacted with the rocks from the SDT.

KEY WORDS: UHP metamorphism; fluid inclusions; oxygen and hydrogen isotopes; REE elements; Dabie Shan


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