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Volume 15 Issue 4
Dec 2004
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Article Contents
Yican Liu, Shuguang Li, Shutong Xu, Guanbao Chen. Retrogressive Microstructures of the Eclogites from the Northern Dabie Mountains, Central China: Evidence for Rapid Exhumation. Journal of Earth Science, 2004, 15(4): 349-354.
Citation: Yican Liu, Shuguang Li, Shutong Xu, Guanbao Chen. Retrogressive Microstructures of the Eclogites from the Northern Dabie Mountains, Central China: Evidence for Rapid Exhumation. Journal of Earth Science, 2004, 15(4): 349-354.

Retrogressive Microstructures of the Eclogites from the Northern Dabie Mountains, Central China: Evidence for Rapid Exhumation

Funds:

Chinese National Key Project for Basic Research 2003CB716500

the Major State Research Program of China G1999075503

the National Natural Science Foundation of China 40172079

the National Natural Science Foundation of China 40399140

  • Received Date: 08 Aug 2004
  • Accepted Date: 20 Nov 2004
  • The ultrahigh-pressure eclogites from the northern Dabie Mountains in central China occurred as tectonic lens or blocks within granitic gneisses or meta-peridotites. Petrologic studies suggest that the studied eclogites experienced strongly retrogressive metamorphism and produced a series of characteristic retrogressive microstructures. The retrograde structures mainly include: (1) oriented needle mineral exsolution, e.g., quartz needles in Na-clinopyroxene and rutile, clinopyroxene and apatite exsolution in garnet formed under decreasing pressure conditions during exhumation; (2) symplectite, especially, two generations of symplectites developed outside the garnet grains, which are called "double symplectite" here; (3) compositional zoning of minerals such as garnet and clinopyroxene; (4) minerals with a reaction rim or retrograde rim, e.g., omphacite with a diopside rim, diopside with an amphibole rim and rutile with a rim of ilmenite. These retrograde textures, especially mineral zoning and symplectite, provide important petrologic evidence for the exhumation process and uplift of high-grade metamorphic rocks such as eclogite in the northern Dabie Mountains, indicating a rapid exhumation process.

     

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