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

为了了解变形在变质作用中的作用，我研究了德岛县毕赞、兵库县女岛和和歌山市的三百川变质带，美国西海岸山脉的方济各会杂岩，美国华盛顿州的西北瀑布系统，以及伊豆-小川和马里亚纳弧前地区的高压变质带。对三叶川和龟井滩变质带进行了40天的野外考察。我分析了变形组构，测量了线理、拉伸线理和面理。以前的工作人员证明，在比赞、女岛和和歌山市的三巴川变质带中，伸展线理的优势方向是东西向。伸展线理显微组构分析表明，在变质末期，随着温度的升高，拉分组构逐渐形成。我根据1989-1992年采集的岩石样品研究了方济各会杂岩和西北瀑布体系。在方济各会杂岩中，垂直于带的伸展线理十分发育。这种线理可能反映了俯冲带内构造块体的相对运动。我检查了疏浚样品和钻探样品的变形组构，这些样品分别是在东京大学白宇-丸号巡航KH87-3和大洋钻探计划第125航段期间从伊豆-小川和马里亚纳前弧获得的。线理显微组构分析表明，蛇纹岩底辟在抬升过程中发生变形。

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.