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CHARACTERISTICS OF THE GEZHEN BRITTLE-DUCTILE SUPERIMPOSITION SHEAR ZONE AND ITS SIGNIFICANCE FOR ORE FORM ATION

Xinquan Liang

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Abstract

The Gezhen brittle-ductile supperimposition shear zone is a narrow, long and highly-strained zone, extending in a north-east direction through the Tuwaishan gold deposit area in Hainan Island. It has the following characteristics: obvious plastic flow, shear strain and progressive evolution. The rocks in the zone underwent intense ductile deformation, mylonitization, superimposed cataclastization and retrograde metamorphism in greenschist facies. Subsequently, a set of mylonite series with different time and lithological characters formed and shaped like lensoid. Among them the most prominent is a set of quartz-feldspathic mylonite series similar to migmatite. The discovery and identification of the shear zone is of important significance for the study of the Tuwaishan ore genesis and for prospecting.

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The Gezhen brittle-ductile supperimposition shear zone is a narrow, long and highly-strained zone, extending in a north-east direction through the Tuwaishan gold deposit area in Hainan Island. It has the following characteristics: obvious plastic flow, shear strain and progressive evolution. The rocks in the zone underwent intense ductile deformation, mylonitization, superimposed cataclastization and retrograde metamorphism in greenschist facies. Subsequently, a set of mylonite series with different time and lithological characters formed and shaped like lensoid. Among them the most prominent is a set of quartz-feldspathic mylonite series similar to migmatite. The discovery and identification of the shear zone is of important significance for the study of the Tuwaishan ore genesis and for prospecting.

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Available abstract

The Gezhen brittle-ductile supperimposition shear zone is a narrow, long and highly-strained zone, extending in a north-east direction through the Tuwaishan gold deposit area in Hainan Island. It has the following characteristics: obvious plastic flow, shear strain and progressive evolution. The rocks in the zone underwent intense ductile deformation, mylonitization, superimposed cataclastization and retrograde metamorphism in greenschist facies. Subsequently, a set of mylonite series with different time and lithological characters formed and shaped like lensoid. Among them the most prominent is a set of quartz-feldspathic mylonite series similar to migmatite. The discovery and identification of the shear zone is of important significance for the study of the Tuwaishan ore genesis and for prospecting.

Key concepts: Mylonite, Shear zone, Geology, Metamorphism, Greenschist, Tectonite, Shear (geology), Quartz

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CHARACTERISTICS OF THE GEZHEN BRITTLE-DUCTILE SUPERIMPOSITION SHEAR ZONE AND ITS SIGNIFICANCE FOR ORE FORM ATION — Research Paper | ScholarLens