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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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Acta Geologica Sinica(English Edition) 1998年第1期72卷 37-50页

作者： YANG Xiaoyong LUI Deliang YANG Xueming WANG Kuiren DAI Jinxing Department of Earth and Space Sciences Advanced Centre for Earth Sciences and AstronomyUniversity of Science and Technology of Chinathe Third World Academy of SciencesHefeiAnhui 230026 Research Institute of Petroleum Exploration and Development China National Petroleum CorporationBeijing 100083

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.

关键词： mylonite ductile shear zones volume loss fluid-rock interaction compositional migration Tancheng-Lujiang fault belt

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