“罗田穹隆”中的下地壳俯冲成因榴辉岩及其地质意义

刘贻灿; 徐树桐; 李曙光; 陈冠宝; 彭练红

Volume 30 Issue 1

Jan. 2005

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Article Navigation > Earth Science > 2005 > 30(1): 71-77

LIU Yi-can, XU Shu-tong, LI Shu-guang, CHEN Guan-bao, PENG Lian-hong, 2005. Eclogite from the Subducted Lower Crust of the Yangtze Plate within the Luotian Dome and its Geological Implication. Earth Science, 30(1): 71-77.

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Eclogite from the Subducted Lower Crust of the Yangtze Plate within the Luotian Dome and its Geological Implication

1.
School of Earth and Space Sciences , University of Science and Technology of China , Hefei 230026, China
2.
Geological Survey of Anhui Province, Hefei 230001, China
3.
Geological Survey of Hubei Province, Wuhan 430022, China

Received Date: 2004-12-24
Publish Date: 2005-01-25

Abstract

Abstract

The eclogite produced from the subducted mafic lower crust of the Yangtze continental plate is a new finding within the Luotian dome in northern Dabie Mountains. The eclogites occur as lens in garnet-bearing banded gneisses. The mineral assemblage of the eclogite is garnet, omphacite, rutile and quartz; secondary minerals are hornblende, plagioclase, hypersthene, diopside and ilmenite. The eclogites from the Luotian dome have typical characteristics with relics of earlier hypersthene and plagioclase minerals of granulite-facies and latter overprinting of granulite-facies. No aqueous mineral formed during peak metamorphism may be related to their protoliths, which come from the lower crust. Petrologic evidence suggests that the eclogites studied were produced from the mafic lower crust of the Yangtze continent and suffered from granulite- and amphibolite-facies retrogressive metamorphism. At present, mafic rocks from the lower crust in the Dabie Mountains or even in the northern Yangtze plate have been scarce, which may be delaminated and recycled into underlying convecting mantle. These provide key petrologic evidence for formation and evolution of the Luotian dome, and formation and exhumation processes and uplift of high-grade metamorphic rocks such as eclogite in the northern Dabie Mountains.
- eclogite,
- granulite-facies,
- lower crust,
- Luotian dome,
- northern Dabie Mountains

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References(29)

References

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Eclogite from the Subducted Lower Crust of the Yangtze Plate within the Luotian Dome and its Geological Implication

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