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Zircon from UHP metamorphic rocks in the Dabie-Sulu terrane, China

Fulai Liu

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Abstract

Laser Raman spectroscopy and cathodoluminescence images reveal that inclusions of UHP minerals represented by coesite occur in zoned zircons from strongly retrograded metamorphic rocks in Dabie-Sulu UHP terrane, including orthogneiss, paragneiss, amphibolite, kyanite-bearing quartzite, impure marble and mica schist, and that they all record very uniform temperature-pressure conditions of UHP metamorphism: T=732-866℃ and p=2.8-4.0 GPa. The common occurrence of UHP mineral inclusions in zircons of eclogite and its country rocks in the Dabie-Sulu terrane suggests that voluminous continental materials were subducted to the mantle depth (120 km) and experienced UHP metamorphism.

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What this paper is about

Laser Raman spectroscopy and cathodoluminescence images reveal that inclusions of UHP minerals represented by coesite occur in zoned zircons from strongly retrograded metamorphic rocks in Dabie-Sulu UHP terrane, including orthogneiss, paragneiss, amphibolite, kyanite-bearing quartzite, impure marble and mica schist, and that they all record very uniform temperature-pressure conditions of UHP metamorphism: T=732-866℃ and p=2.8-4.0 GPa. The common occurrence of UHP mineral inclusions in zircons of eclogite and its country rocks in the Dabie-Sulu terrane suggests that voluminous continental materials were subducted to the mantle depth (120 km) and experienced UHP metamorphism.

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Available abstract

Laser Raman spectroscopy and cathodoluminescence images reveal that inclusions of UHP minerals represented by coesite occur in zoned zircons from strongly retrograded metamorphic rocks in Dabie-Sulu UHP terrane, including orthogneiss, paragneiss, amphibolite, kyanite-bearing quartzite, impure marble and mica schist, and that they all record very uniform temperature-pressure conditions of UHP metamorphism: T=732-866℃ and p=2.8-4.0 GPa. The common occurrence of UHP mineral inclusions in zircons of eclogite and its country rocks in the Dabie-Sulu terrane suggests that voluminous continental materials were subducted to the mantle depth (120 km) and experienced UHP metamorphism.

Key concepts: Terrane, Geology, Coesite, Metamorphism, Kyanite, Zircon, Eclogite, Metamorphic rock

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Zircon from UHP metamorphic rocks in the Dabie-Sulu terrane, China — Research Paper | ScholarLens