大别山北部榴辉岩的大地构造属性及冷却史

刘贻灿; 徐树桐; 李曙光; 江来利; 陈冠宝; 吴维平

Volume 28 Issue 1

Jan. 2003

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LIU Yi-can, XU Shu-tong, LI Shu-guang, JIANG Lai-li, CHEN Guan-bao, WU Wei-ping, 2003. Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains. Earth Science, 28(1): 11-16.

Citation:

LIU Yi-can, XU Shu-tong, LI Shu-guang, JIANG Lai-li, CHEN Guan-bao, WU Wei-ping, 2003. Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains. Earth Science, 28(1): 11-16.

LIU Yi-can, XU Shu-tong, LI Shu-guang, JIANG Lai-li, CHEN Guan-bao, WU Wei-ping, 2003. Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains. Earth Science, 28(1): 11-16.

Citation:

LIU Yi-can, XU Shu-tong, LI Shu-guang, JIANG Lai-li, CHEN Guan-bao, WU Wei-ping, 2003. Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains. Earth Science, 28(1): 11-16.

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Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains

1.
Department ofEarth and Space Sciences, USTC, Hefei 230026, China
2.
Anhui AcademyofGeologi- cal Survey, Hefei 230001, China

Received Date: 2002-05-12
Publish Date: 2003-01-25

Abstract

Abstract

The petrologic geochemistry and isotopic chronology of the eclogites imply most of the eclogites in the northern Dabie Mountains produced from the Triassic Yangtze subducted continental crust (lower crust 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 represent the meta tectonic melange produced during the active subduction of an ancient oceanic slab and subsequent collision between the Yangtze and North China continental plates. The cooling history of the eclogites from about 900 ℃ to 300 ℃ can be subdivided into three stages: one isothermal stage and two rapid cooling stages. The initial stage during (230±6) Ma and ca 210 Ma was a near-isothermal or temperature rise process corresponding to the retrograded metamorphism of granulite facies with a rapid uplift of about 4 mm/a, then two fast cooling stages occurred with cooling rate of about 10 ℃/Ma (210 Ma to (172±3) Ma) and about 4 ℃/Ma ((172±3) Ma to 130 Ma). After the ultra-high pressure metamorphism of eclogite facies, relatively slower uplift rate and cooling rate and high-T overprinting of granulite facies metamorphism is the major difference of the eclogites in northern Dabie Mountains from those in southern Dabie Mountains.
- eclogite,
- tectonic setting,
- cooling history,
- northern Dabie Mountain.

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References(35)

References

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