高压-超高压变质岩石中不同成因的石榴石

夏琼霞

doi:10.3799/dqkx.2019.235

Volume 44 Issue 12

Dec. 2019

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Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235

Citation:

Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235

Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235

Citation:

Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235

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Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks

doi: 10.3799/dqkx.2019.235

Xia Qiongxia^,

CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2019-08-29
Publish Date: 2019-12-15

Abstract

Abstract

Garnet is one of the most important mineral in high pressure (HP) to ultrahigh pressure (UHP) metamorphic rocks. It is an ideal phase to constrain the P-T-t conditions of metamorphic and anatectic processes during continental subduction zone metamorphism. Garnets from subduction zone metamorphic rocks can be classified into metamorphic,magmatic and peritecitc garnets based on their typical features. Magmatic garnet crystallizes from magmatic melts,shows almandine-spessartine in compositions and contains crystal inclusions such as quartz,feldspar and apatite. Metamorphic garnet forms through metamorphic reactions at subsolidus conditions,shows decreasing spessartine from core to rim,and contains crystal inclusions mainly composed of metamorphic reactants. Peritectic garnet forms through peritectic reactions at supersolidus conditions,and contains crystal inclusions consisting of not only minerals crystallized from peritectic melts but also residual minerals from peritectic reactants. The identification of peritecitc garnet in UHP metamorphic rocks provides unique evidence for partial melting of the deeply subducted continental crust,which is an important progress in crustal anatexis of collisional orogens.
- peritectic garnet,
- metamorphic garnet,
- magmatic garnet,
- high to ultrahigh pressure,
- partial melting,
- petrology

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References(23)

References

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