Study on movement pictures of tectonic collage based on microtexture analysis of rocks and minerals

本研究是在对日本构造拼贴的岩石和矿物进行显微镜和透射电子显微镜(JEM-2000ES)显微结构分析的基础上，通过电子探针分析变质矿物的化学成分和放射性年龄，分析其组成变质带的P-T-t-D轨迹的基础上，重点研究日本构造拼贴的运动特征。所研究的变质带有日达带、三郡带、龙克带、桑巴加瓦带、阿布库马带和日卡带。尤其是Sambagawa带、Ryoke带、Hida带和Hidaka带的研究进展尤其值得注意。分析了日达带Unazuki亚带的构造史、火成岩史、火成岩时代和与火成活动有关的变形样式。阐明了侏罗纪花岗岩在日达带推覆构造形成过程中侵入了一条大型断裂带。在Ryoke带上有一种…更详细地分析了Ryoke古老花岗岩的糜棱岩化及其变形样式的运动图景，特别是石英和长石的变形样式。指出超糜棱岩的成因可归因于斜长石和钾长石的微破裂和裂隙物质的重结晶。分析了东达卡岩带的构造史、火成岩史以及与火成活动有关的岩石运动图景和变形样式。第一阶段岩浆来自俯冲海脊(可能是库拉-太平洋海脊)，第二阶段岩浆为钙碱性岩浆。详细分析了桑巴加瓦带的地质构造、最高温期的热结构、构造变质过程、各变形阶段的运动图景以及各变形阶段岩石和矿物的变形方式，阐明了P-T-t-D轨迹。所得结果对了解高压型变质岩的隆升过程具有重要意义。较少

Study on movement victbres of Japanese tectonic collage is focused in this research project on the basis of analysis of microtextures of rocks and minerals under microscope and transmission electron microscope(JEM- 2000ES) and P-T-t-D paths in its constituent metamorphic belt, which are based on analysis of chemical composition of metamordhic minerals by electron probe microanalyser and of radiometric ages. The studied metamorphic belts are Hida belt, Sangun belt, Ryoke belt, Sambagawa belt, Abukuma belt and Hidaka belt. Especially, the research progress in the Sambagawa belt, Ryoke belt, Hida belt and Hidaka belt appears to be noteworthy. In the Unazuki subbelt of the Hida belt have been analyzed the tectonic history, igneous history, ages of igneous rocks and deformation styles related to igneous activity. It has been clarified that the Jurassic granitic rocks intruded into a great fracture zone during the formation process of the nappe of the Hida belt. In the Ryoke belt have been a … More nalyzed movement picture of mylonitization of the Ryoke older granitic rocks and their deformation styles with special reference to deformation styles of quartz and feldspar. It has been pointed out that the origin of ultramylonites is ascribed to microfracturing of plagioclase and K-feldspar and to recrystallization of fractured materials. In the Hidaka belt have been analyzed the tectonic history, igneous history and movement pictures and deformation style of rocks related to the igneous activity. It has been clarified that the ianeous intrusions occurred in fractured zones and that the first stage magma was derived from a subducted ridge (probably Kula-Pacific ridge) and the second stage magma was of calc-alkaline type. In the Sambagawa belt have been in great details analyzed the geological structure, thermal structure of the highest-temperature phase, tectono-metamorphic processes, movement pictures of individual deformation phases and deformation styles of rocks and minerals during individual deformation phases, clarifying P-T-t-D path. The obtained results are considered to be considerablly available for understanding of the uplifting process of the high-pressure type metamorphic rocks. Less