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Kinematic analyzes of low-T and high-P metamorphic belt

低T高P变质带运动学分析

基本信息

批准号：
04640737
负责人：
MAEKAWA Hirokazu
金额：
$ 0.9万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

To understand a role of deformation during metamorphism, I studied Sanbagawa metamorphic belt at Bizan, Tokushima Prefecture, Nushima, Hyogo Prefecture, and Wakayama City, Franciscan complex at West Coast Range, U.S.A., Northwest Cascades System at Washington State, U.S.A., and high-pressure metamorphic belt at Izu-Ogasawara, Mariana forearc regions. Forty days were spent for field work of the Sanbagawa and Kamuikotan metamorphic belts. I analyzed deformation fabrics, and measured lineation stretching lineation and foliation. As demonstrated by previous workers, predominant direction of stretching lineation is E-W in the Sanbagawa metamorphic belt at Bizan, Nushima, and Wakayama City. An analysisi of microfabrics of stretching lineation indicates that the pull-apart fabrics have benn formed with increase of temperature at the final stage of metamorphism. I studied Franciscan Complex and Northwestern Cascade System in term of the rock samples taken in 1989-1992. In the Franciscan Complex, stretching lineation normal to the belt is well developed. The lineation probably reflects relative movement of tectonic blocks within subduction zone. I examined deformation fabrics of dredge samples and drilled samples, obtained from Izu-Ogasawara and Mariana forearcs during Hakuho-maru cruise KH87-3, University of Tokyo, and Ocean Drilling Program Leg 125, respectively. Analyzes of microfabrics of lineation indicate that the deformation occurred during uplift by serpentinite diapir.

为了了解变形在变质作用中的作用，我研究了德岛比山的三巴川变质带、兵库县的努岛和和歌山市，美国西海岸山脉的方济会杂岩，美国华盛顿州的西北瀑布系统，以及马里亚纳弧前地区的伊津小笠原高压变质带。用了40天的时间对三巴川变质带和神影滩变质带进行了野外考察。我分析了变形织物，并测量了线理，拉伸线理和面理。前人的研究表明，在比赞、Nushima和和歌山市的三巴川变质带，拉伸线理的主要方向是东西向。对拉伸线理微组构的分析表明，在变质作用的最后阶段，随着温度的升高，形成了拉离组构。我以1989-1992年采集的岩石样品为研究对象，研究了方济会复合体和西北级联系统。在方济杂岩中，向带方向伸展线理发育。线理可能反映了俯冲带内构造块体的相对运动。我检查了在Hakuho-maru巡航KH87-3、东京大学和海洋钻探计划Leg 125期间分别从Izu-Ogasawara和Mariana的研究人员那里获得的疏浚样本和钻探样本的变形结构。线理微组构分析表明，变形发生在蛇纹岩底辟隆升过程中。