Experimental Investigation on Low-Degree Dehydration Partial Melting of Biotite Gneiss and Phengite-Bearing Eclogite at 2 GPa

Qiang Liu; Yao Wu; Junfeng Zhang

doi:10.1007/s12583-011-0219-0

Volume 22 Issue 6

Dec 2011

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Journal of Earth Science > 2011 > 22(6): 677-687.

Qiang Liu, Yao Wu, Junfeng Zhang. Experimental Investigation on Low-Degree Dehydration Partial Melting of Biotite Gneiss and Phengite-Bearing Eclogite at 2 GPa. Journal of Earth Science, 2011, 22(6): 677-687. doi: 10.1007/s12583-011-0219-0

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Qiang Liu, Yao Wu, Junfeng Zhang. Experimental Investigation on Low-Degree Dehydration Partial Melting of Biotite Gneiss and Phengite-Bearing Eclogite at 2 GPa. Journal of Earth Science, 2011, 22(6): 677-687. doi: 10.1007/s12583-011-0219-0

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Experimental Investigation on Low-Degree Dehydration Partial Melting of Biotite Gneiss and Phengite-Bearing Eclogite at 2 GPa

doi: 10.1007/s12583-011-0219-0

Qiang Liu^{1
,
,},
Yao Wu²,
Junfeng Zhang^{1, 2}

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

Funds:

the National Natural Science Foundation of China 40802046

the National Natural Science Foundation of China 90714005

the National Key Basic Research Program from MOST 2009CB825003

More Information

Corresponding author: Qiang Liu, liuqiang@cug.edu.cn
Received Date: 10 Aug 2011
Accepted Date: 15 Sep 2011
Publish Date: 01 Dec 2011

Abstract

Abstract

The ultrahigh-pressure (UHP) eclogite and gneiss from the Dabie (大别)-Sulu (苏鲁) orogen experienced variable degrees of partial melting during exhumation. We report here dehydration partial melting experiments of biotite gneiss and phengite-bearing eclogite at 2 GPa and 800–950 ℃. Our results show that the partial melting of gneiss is associated with the breakdown of biotite into almandine-rich garnet starting at 900 °. About 10% granitic melt can be produced at 950 ℃. In contrast, the partial melting of phengite-bearing eclogite exists at slightly lower temperatures (800–850 ℃). The melt fraction is in general more in biotite gneiss than in phengite-bearing eclogite under similar pressure and temperature conditions. Both melts are rich in silica and alkali, but poor in FeO, MgO and CaO. These results suggest that low-degree partial melting of gneiss and eclogite is often associated with dehydration of hydrous mineral, such as micas. The dehydration temperature and melt composition can place important constraints on the partial melting phenomena (granitic leucosome and multi-phase mineral inclusions) recorded in UHP rocks.
- gneiss,
- eclogite,
- partial melting,
- dehydration,
- phengite,
- biotite

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References(43)

References

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