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

为了理解变形在变质作用中的作用，我研究了德岛县备山、兵库县怒岛和美国西海岸山脉的方济各会杂岩和歌山市的三宝川变质带，美国华盛顿州的西北瀑布系统，伊豆-小笠原、马里亚纳弧前高压变质带。花了40天的时间对三坝川和Kamuikotan变质带进行了野外工作。我分析了变形组构，测量了线理拉伸线理和叶理。如前人工作所证明的，在别山、牛岛和和歌山市的三宝川变质带中，拉伸线理的主要方向是E-W。拉伸线理显微组构分析表明，拉分组构是在变质末期随温度升高而形成的。根据1989-1992年采集的岩石样品，研究了方济各会杂岩和西北阶地体系。在方济各杂岩中，垂直于该带的拉伸线理非常发育。线理可能反映了俯冲带内构造块体的相对运动。我检查了变形组构的疏浚样品和钻孔样品，从伊豆小笠原和马里亚纳前弧在Hakuho-maru巡航KH 87 -3，东京大学，大洋钻探计划腿125，分别。线理微组构分析表明，变形发生在蛇纹岩底辟隆升过程中。

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.