Tectonic Affinity, <i>T</i>-<i>t</i> Path and Uplift Trajectory of Eclogites from Northern Dabie Mountains, Central-Eastern China

Yican Liu; Shutong Xu; Shuguang Li; Laili Jiang; Guanbao Chen; Weiping Wu

Mar 2003

Article Contents

Journal of Earth Science > 2003 > 14(1): 28-33.

Yican Liu, Shutong Xu, Shuguang Li, Laili Jiang, Guanbao Chen, Weiping Wu. Tectonic Affinity, T-t Path and Uplift Trajectory of Eclogites from Northern Dabie Mountains, Central-Eastern China. Journal of Earth Science, 2003, 14(1): 28-33.

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Tectonic Affinity, T-t Path and Uplift Trajectory of Eclogites from Northern Dabie Mountains, Central-Eastern China

Department of Earth and Space Sciences, USTC, Hefei 230026
Anhui Institute of Geology, Hefei 230001
Anhui Institute ofGeology, Hefei 230001
Department ofEarth and Space Sciences, USTC, Hefei 230026
Anhui Institute ofGeology, Hefei 230001

Funds:

the National Natural Science Foundation of China 49794041

the National Natural Science Foundation of China 40052002

the National Natural Science Foundation of China 40172079

the National Natural Science Foundation of China 40072070

Anhui Bureau of Geology and Mineral Resources

Received Date: 12 Jun 2002
Accepted Date: 20 Nov 2002

Abstract

Abstract

Petrologic geochemistry and isotopic chronology of the eclogites sug ge st that most of the eclogites in northern Dabie Mountains produced from the Tria ssic Yangtze subducted continental crust (lower crust and formed during the deep subduction) and the metamorphosed mafic-untramafic belt with eclogite, marble and meta peridotite blocks around the Mozitan-Xiaotian fault zone may represen t the meta tectonic melange produced during the active subduction of an ancient oceanic slab and subsequent collision between the Yangtze and North China conti nental plates. The cooling history of the eclogites from ~900 ℃ to 300 ℃ can b e subdivided into three stages: one isothermal stage and two rapid cooling stage s. The initial stage between (230±6) and 210 Ma was a near-isothermal or tempe rature rise process corresponding to the retrograded metamorphism of granulite facies with a rapid uplift of 4 mm/a, then two fast cooling stages occurred with cooling rate of ~10 ℃/Ma during 210 Ma to (172±3) Ma and ~4 ℃/Ma durin g (172±3) Ma to 130 Ma. After the peak metamorphism of eclogite-facies, their initial isothermal stage with slower uplift rate and cooling rate and high-T overprinting of granulite-facies metamorphism is the major difference between the eclogites in northern Dabie Mountains from those in southern Dabie Mountains. This may be one of the most important reasons to preserve few evidences of earl ier ultrahigh pressure metamorphism.
- eclogite,
- tectonic affinity,
- T-t path and uplift trajectory,
- northern Dabie Mountains

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References(36)

References

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