Cathodoluminescence observations on low-temperature mylonites: potential for detection of solution-precipitation microstructures
Cathodoluminescence observations on low-temperature mylonites: potential for detection of solution-precipitation microstructures
复制标题
低温糜棱岩的阴极发光观察：检测溶液沉淀微结构的潜力
DOI：
10.1016/0191-8141(91)90091-v
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发表时间：
1991
影响因子：
3.1
通讯作者：
K. Asai
中科院分区：
文献类型：
--
作者：
T. Shimamoto;Y. Kanaori;K. Asai
本文描述了日本中部低温花岗岩糜棱岩的阴极发光（CL）图像，使用扫描电子显微镜获得。本文认为CL观测为阐明糜棱化过程中溶液转移过程的重要性提供了一个简单而有力的工具。碎裂变形，如长石的破裂，伴随着溶解-沉淀过程，被发现在CL图像中比使用其他技术更清楚地观察到。结果还表明，即使经过塑性变形，从溶液中析出的石英颗粒也能与花岗岩中的原始石英颗粒相区别。未来需要对糜棱岩进行更详细的CL工作，因为定量评估深断裂带中溶解-降水过程的作用对于限制断层在深度上的流变特性至关重要。
This note represents cathodoluminescence (CL) images, obtained using a scanning electron microscope, of a low-temperature granitic mylonite from central Japan. It is argued that CL observations offer a simple but powerful tool for elucidating the importance of solution-transfer processes during mylonitization. Cataclastic deformation such as fracturing of feldspars, accompanied by solution-precipitation processes, were found to be much more clearly observable in CL images than using other techniques. It is also shown that quartz grains precipitated from solution can be distinguished from original quartz grains in the granite, even after being deformed plastically. More detailed CL work on mylonites is needed in the future, since quantitative evaluation of the role of solution-precipitation processes in deep fault zones is essential for constraining the rheological properties of faults at depth.