| 大别超高压岩石中石英的组构和变形 |
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| 引用本文： | 焦述强,金振民,金淑燕,陈章玉.大别超高压岩石中石英的组构和变形[J].吉林大学学报(地球科学版),2001,31(1):32-36. |
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| 作者姓名： | 焦述强 金振民 金淑燕 陈章玉 |
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| 作者单位： | 1. 福州大学 环境与资源 工程系，福建 福州 350002
2. 中国地质大学 地学院，湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金资助项目(49672144)；福州大学科学基金资助项
目(21435) |
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| 摘 要： | 通过对大别地区不同超高压岩石和同一超高压岩石中不同变形期次石英的变形特征的研究 ,探讨超高压岩石折返时的流变学特征和状态。运用野外构造解析、组构分析、透射电镜和应变分析发现 ,除榴辉岩中静态重结晶石英外 ,其它超高压岩石中石英均发生了强烈的塑性变形 ,波状消光、变形纹、变形条带等极为常见。石英石榴岩中石英交叉滑移位错的发育 ,说明经历了高温位错蠕变 ,其代表的差异应力为Δσ =78.92MPa。石英脉的变形是超高压岩石折返到中地壳以后的角闪岩相退变峰期产物 ,其差异应力为Δσ =2 5 .2MPa。超高压二云母片岩中石英典型的糜棱结构代表的差异应力为 :Δσ =5 9.6 1MPa。大别超高压岩石可能是在构造应力比较低的情况下区域隆升的结果
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| 关 键 词： | 超高压岩石 石英 组构 变形 大别山地区 |
| 文章编号： | 1008-0058(2001)01-0032-05 |
| 修稿时间： | 2000年6月22日 |
FABRIC AND DEFORMATION OF QUARTZ IN DABIE ULTRA-HIGH-PRESSURE ROCKS |
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| JIAO Shu_qiang ,JIN Zhen_min ,JIN Shu_yan ,CHEN Zhang_yu.FABRIC AND DEFORMATION OF QUARTZ IN DABIE ULTRA-HIGH-PRESSURE ROCKS[J].Journal of Jilin Unviersity:Earth Science Edition,2001,31(1):32-36. |
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| Authors: | JIAO Shu_qiang JIN Zhen_min JIN Shu_yan CHEN Zhang_yu |
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| Institution: | JIAO Shu_qiang 1,JIN Zhen_min 2,JIN Shu_yan 2,CHEN Zhang_yu 2 |
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| Abstract: | By way of studing on the deformations of quartzs in dif ferentultra-high-pressure(UHP) rocks or in same rocks but with different deform ation phases, the rheological characters and states of UHP rocks during its ex humation have been deduced. The results of field structure analysis, fabric, T EM and strain analysis showed that the quartz in UHP rocks had undergone strong ductile deformation with extremely developed undulate distinction, deformation ribbon and deformation strips except the static recrystallized one in eclogite . The developed cross sliping dislocations in quartz of garnetite indicates th at the UHP rocks had undergone high-temperature dislocation creep with flow s tress Δσ=78.92 MPa. The deformation of quartz vein with flow stress Δ σ=25.2 MPa is the results of the retrometamorphism of amphibolite facies aft er exhumation into middle-crust. The flow stress of typical mylonitic structure in UHP bimica schists is Δσ=59.61 MPa. It is conclude that the ex humation of Dabie UHP rocks might be the resu lt of regional uplift under the condition of lower structure stress. |
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| Keywords: | ultra-high-pressure rocks quartz fabric deformation Dabie area |
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