| 四川石棉田湾磨西剪切带的变形特征及其运动学分析 |
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| 引用本文： | 吴香尧,骆耀南.四川石棉田湾磨西剪切带的变形特征及其运动学分析[J].成都理工大学学报(自然科学版),1998(4). |
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| 作者姓名： | 吴香尧 骆耀南 |
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| 作者单位： | 成都理工学院地质学系(吴香尧)，四川省地质局(骆耀南) |
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| 摘 要： | 根据四川石棉田湾地区地质背景的实际资料，指出磨西脆－韧性剪切带乃是控矿构造，它控制田湾矿田的展布，其派生的次一级构造控制了矿体方向。薄片观察结果揭示千糜岩是由原岩以硅质白云岩经剪切变形和变质作用而形成的。它有五种类型，即绢英白云千糜岩、白云石英千糜岩、绢英千糜岩、硅质千糜岩、石英绿泥千糜岩。硅质白云岩的变形作用产生许多特色的显微构造和石英Ｃ轴组构；而变质作用则以广泛的退变质为特征，二者密不可分，它们共同产生千糜岩和含矿石英脉。
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| 关 键 词： | 脆－韧性剪切带，硅质白云岩，构造岩类型，千糜岩 |
DEFORMATIONAL FEATURE OF THE MOXI SHEAR ZONE IN THE TIANWAN AREA AND ITS KINEMATIC ANALYSIS |
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| Wu Xiangyao.DEFORMATIONAL FEATURE OF THE MOXI SHEAR ZONE IN THE TIANWAN AREA AND ITS KINEMATIC ANALYSIS[J].Journal of Chengdu University of Technology: Sci & Technol Ed,1998(4). |
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| Authors: | Wu Xiangyao |
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| Abstract: | Based on the actual data of the geological setting in the Tianwan area, the Moxi brittle ductile shear zone is believed to belong to ore controlling structure. It controls the extending direction of the Tianwan orefield, and their derived secondary structures control the strike of ore bodies respectively . The investigation of sheared rocks indicates that phyllonite is siliceous dolomitite formed by shear strain and metamorphism. There are five types of tectonite, that is, sericite quartz dolomite phyllonite, dolomite quartz phyllonite, sericite quartz phyllonite, siliceous phyllonite, and quartz chlorite phyllonite. Deformation of the siliceous dolomitite produced many kinds of microstructure and quartz C axis fabric in phyllonite, while metamorphism is characterized by the widely scattered retrogressive metamorphism. Deformation and metamorphism are unseparable, and the product of deformation metamorphism is the formation of the phyllonite and ore bearing quartz veins. |
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| Keywords: | brittle ductile shear zone siliceous dolomitite type of tectonite phyllonite |
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