| 云南白秧坪矿区华昌山断裂带构造岩的微观变形特征 |
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| 引用本文：余凤鸣,何龙清,陈开旭.2011.云南白秧坪矿区华昌山断裂带构造岩的微观变形特征[J].地球学报,32(1):37-45. |
| DOI：10.3975/cagsb.2011.01.05 |
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| 基金项目:原地质矿产部定向基金项目(编号: 地科定98－13) |
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| 中文摘要:云南白秧坪矿区位于兰坪中-新生代前陆盆地北部, 华昌山断裂带是矿区最重要的控矿构造, 沿断裂带产出一系列Pb-Zn-Ag-Cu多金属矿体, 其成矿元素在断裂带内的分布与构造岩的分带有明显的对应关系。华昌山断裂带是与金沙江造山带有关的前陆逆冲推覆构造系统的前锋推覆断裂, 以脆性变形为主, 形成碎裂岩系列的构造岩。通过比较系统的断裂带构造岩样品的显微变形观察、方解石机械双晶发育程度观测、方解石组构分析, 认为华昌山断裂带自边部往中心变形明显增强, 岩石结构、方解石颗粒边界形态、粒度显示一定的变化规律, 方解石C-T图解显示主要的运动方式为SE盘往NW方向逆冲。 |
| 中文关键词:白秧坪矿区 华昌山断裂带 构造岩 显微变形特征 |
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| Microdeformation Characteristics of the Tectonite from the Huachangshan Fault Zone in the Baiyangping Ore District, Yunnan Province |
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| Abstract:The Baiyangping ore district is located in northren Lanping Mesozonic-Cenozoic foreland basin, Yunnan Province. A front fault of the nappe system related to the Jinshajian orogenic belt is the most important ore-controlling structure in the ore district, and there is a series of Pb-Zn-Ag-Cu polymetallic ore bodies along the Huachangshan fault zone. There exists a corresponding relationship between the distribution of ore-forming elements and the zoning of the tectonite. The deformation of the fault was brittle and formed the cataclastic tectonites. According to microdeformation observations of the tectonite samples from the fault zone, development degree observations of mechanical twinning, and the fabric analysis of the calcite, it is considered that the enhancement of deformation from the edge to the center of the fault zone is obvious. There exists the regular variation of the rock texture, the boundary configuration of the calcite particle and the grain size. The C-T illustration of the calcite shows that the primary?movement direction of the nappe is from SE to NW. |
| keywords:Baiyangping ore district Huachangshan fault zone tectonite microdeformation feature |
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