| 秦岭商丹糜棱岩带构造变形环境的显微构造标志 |
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| 引用本文： | 周建勋.秦岭商丹糜棱岩带构造变形环境的显微构造标志[J].地震地质,1999,21(4):334-340. |
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| 作者姓名： | 周建勋 |
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| 作者单位： | 石油大学(北京),北京,102200 |
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| 基金项目： | 陕西省教委科学研究基金!(JK93016) |
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| 摘 要： | 商丹糜棱岩带不同区段石英和长石的显微构造及石英组构特征表明,商丹糜棱岩带自西向东构造变形环境显示从低绿片岩相至中- 高绿片岩相至高绿片岩相—低角闪岩相的变化规律。低绿片岩相变形环境下,石英多为Ⅰ型条带,长石主要显示脆性破裂特征,石英c 轴组构呈单一环带型式。中- 高绿片岩相变形环境下,石英主要为Ⅱ型石英多晶条带,斜长石主要处于脆性碎裂流动状态,钾长石开始向韧性转化,石英c 轴组构呈绕y 轴分布的点极密型式。高绿片岩相—低角闪岩相变形环境下,石英普遍呈现光性均匀并有120°三连点的动态重结晶和Ⅳ型条带,斜长石开始显示脆- 韧性过渡状态的变形特点,钾长石显示明显的韧性变形特点,石英c 轴组构呈Ⅰ型交叉环带型式
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| 关 键 词： | 显微构造 糜棱岩 构造变形环境 秦岭带 |
| 修稿时间： | 1998年12月1日 |
MICROSTRUCTURAL INDICATORS OF STRUCTURAL DEFORMATION CONDITIONS IN THE SHANGDAN MYLONITE ZONE OF QINLING BELT |
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| ZHOU Jianxun.MICROSTRUCTURAL INDICATORS OF STRUCTURAL DEFORMATION CONDITIONS IN THE SHANGDAN MYLONITE ZONE OF QINLING BELT[J].Seismology and Geology,1999,21(4):334-340. |
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| Authors: | ZHOU Jianxun |
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| Abstract: | Microstructures of quartz and feldspars and quartz fabrics from the Shangdan mylonite zone indicate that from west to east in this zone the structural deformation conditions change from low-greenschist facies to middle- to high- greenschist facies, then become high-greenschist to low-amphibolite facies. Under the deformation condition of low-greenschist facies, quartz is dominated by type Ⅰ quartz ribbons and feldspars are mainly of brittle cracking characteristics. Quartz c-fabrics is of single girdle pat |
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| Keywords: | Microstructure Mylonite Structural deformation condition Qinling belt |
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