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Microstructural study of plastic flow of quartz

石英塑性流动的微观结构研究

基本信息

批准号：
62460050
负责人：
MASUDA Toshiaki
金额：
$ 5.12万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

(1) We collected many quartzose metamorphic rocks from the nine high P/T metamorphic belts in Japan. Their quartz microstructures are roughly classified into two groups: one is characterized by elongated grains with serrated grain boundaries which shows strong undulatory extinction; another is characterized by the equant-equigranular polygonal grains which shows no or only very slight undulatory extinction. The former will be correltated with the S-type microstructure and the latter with the P-type one of Masuda and Fujimura (1981). The former occurs in the Kamuikotan tectonic belt, Yamagami metamorphic rocks and some of the Sambagawa metamorphic belt, while the latter occurs in the Ryoke, the Yaeyama, the Nagasaki and some part of the Sambagawa metamorphic belt. According to Masuda and Fujimura (1981), the former is presumably developed at lower temperatures and faster strain rates than the latter. There are many complex microstructures which cannot be assigned to the former nor the e … More r. The classification of such microstructures is a future problem. (2) The high temperature and high pressure deformation apparatus, which was originall.y built at Nagoya University, was transported to Shizuoka University. After removing the synchronous motor-drive system and setting the computercontrolled stepping-motor system, we tried to perform a deformation experiment at temperature of 800゜C, confining pressure of 4 Kb (400 MPa) and strain rate of 10^<-6>/sec. The starting material of the experiment is the siliceous mylonite which has the foliation defined by the alternation of mica rich layers and quartz rich layers. The mylonite was uniaxially compressed parallel to the foliation, and during the experiment its layers were folded. (3) We proposed a new method that estimated relative palaeodifferential stress using microboudin structure of columnar mineral grains. This method is independent from other palaeopiezometric method such as newly recrystallized grainsize piezometer, subgrain size piezometer and dislocation density piezometer. Less

(1)收集了日本9条高P/T变质带的大量石英变质岩。其石英显微结构大致可分为两类：一类为长形晶粒，锯齿状晶界，表现出强烈的波动消光；另一种是等等晶多边形晶粒，没有或只有非常轻微的波动消光。前者将与s型微观结构相关联，后者与Masuda和Fujimura（1981）的p型微观结构相关联。前者产于龟滩构造带、山神变质岩及部分三巴川变质岩带，后者产于良、八山、长崎及三巴川变质岩带部分。根据Masuda和Fujimura（1981）的说法，前者可能比后者在更低的温度和更快的应变速率下发育。有许多复杂的微观结构不能归属于前者或后者。这些微观结构的分类是一个未来的问题。(2)高温高压变形仪，原来是。在名古屋大学建造，被运送到静冈大学。在拆除同步电机驱动系统，设置计算机控制的步进电机系统后，我们尝试在800 C、4 Kb （400 MPa）围压和10^<-6>/sec应变速率下进行变形实验。实验的起始材料为硅质糜棱岩，其片理由富云母层和富石英层交替形成。糜棱岩被单轴压缩平行于叶理，在实验过程中其层被折叠。(3)提出了一种利用柱状矿物颗粒显微结构估算相对古差应力的新方法。该方法独立于新再结晶粒度计、亚晶粒尺寸计和位错密度计等古压电测量方法。少