Characteristics of Compositional Migration in Mylonites from the Ductile Shear Zones of the Southern Tancheng-Lujiang Fault Belt, Eastern Anhui Province |
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| Authors: | YANG Xiaoyong LUI Deliang YANG Xueming WANG Kuiren |
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| Institution: | YANG Xiaoyong,LUI Deliang,YANG Xueming,WANG KuirenDepartment of Earth and Space Sciences,Advanced Centre for Earth Sciencesand Astronomy,University of Science and Technology of Chin,the Third World Academy of Sciences,Hefei,Anhui and DAI JinxingResearch Institute of Petroleum Exploration and Development,China National Petroleum Corporation,Beijing Zhu Xiling |
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| Abstract: | On the basis of field geology, three typical ductile shear zones in the southern part of the Tancheng-Lujiang fault belt have been chosen for a detailed study. Altogether ten samples of the tectonites have been collected for this study. The paper is focused on a comprehensive study of the tectonites in the medium-lower horizons of the ductile shear zones. The mineral compositions of the rocks are analyzed with EPMA and some typical whole-rock samples analyzed by chemical and ICP methods. Based on the comprehensive study of the characteristics of the deformation, the mineral assemblages and the changes of chemical composition of the bulk rocks, this paper presents a discussion on the relationship between the volume loss, the fluid flow and compositional changes during mylonitization of the ductile shear zones in this region. Our study shows that there are a large amount of fluids flowing through the shear zones during the process of mylonization, accompanied by the loss of rock volume and migration of elements and components. Modelling calculation results under different saturation conditions of fluids show that the maximum volume loss of the tectonites is about 60% relative to their protolith, while the fluid/ rock ratio ranges from 10 to 103 in different ductile shear zones. |
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| Keywords: | mylonite ductile shear zones volume loss fluid-rock interaction compositional migration Tancheng- Lujiang fault belt |
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