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

基于岩矿物微观结构分析的构造拼贴运动图研究

基本信息

批准号：
62440006
负责人：
HARA Ikuo
金额：
$ 17.6万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

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

本研究项目的重点是在显微镜和透射电子显微镜（JEM-2000ES）下分析岩石和矿物的显微结构以及其组成变质带中的P-T-t-D路径的基础上，研究日本构造拼贴的运动胜利，这些路径基于电子探针显微分析仪对变质矿物的化学成分和辐射年龄的分析。研究的变质带有飞騨带、三群带、Ryoke带、三波川带、阿武隈带和日高带。尤其是三波川带、Ryoke带、飞騨带和日高带的研究进展尤为引人注目。分析了飞騨带宇奈月亚带的构造历史、火成岩历史、火成岩年龄以及与火成岩活动有关的变形样式。阐明了飞騨带推覆体形成过程中侏罗纪花岗岩侵入大断裂带。在 Ryoke 地带，对 Ryoke 较老的花岗岩的糜棱岩化运动及其变形样式（特别是石英和长石的变形样式）进行了分析。有人指出，超糜棱岩的成因归因于斜长石和钾长石的微破裂以及破裂物质的再结晶。分析了日高带的构造历史、火成岩历史以及与火成岩活动有关的岩石运动图像和变形方式。现已查明，岩浆侵入发生在断裂带，第一阶段岩浆来自俯冲山脊（可能是库拉太平洋山脊），第二阶段岩浆为钙碱性岩浆。详细分析了桑巴河带的地质结构、最高温相的热结构、构造变质过程、各变形期的运动图像以及各变形期岩石和矿物的变形方式，明确了P-T-t-D路径。所获得的结果对于了解高压型变质岩的抬升过程具有相当的参考价值。较少的