CONSIDERATION ON THE RELATION BETWEEN DUCTILE FLOW AND MOTAMORPHIC REACTIONS IN THE HIGH PRESSURE MOTAMORPHIC BELTS.

总结了卡缪科坦带、桑贡带、新英格兰褶皱带、澳大利亚新英格兰褶皱带等高压变质带中泥质片岩的变形样式。特别是对新英格兰地区发现的鞘褶皱进行了详细的研究。鞘褶皱正是由变形的鞘褶皱变形而成的舌状褶皱，认为该褶皱既有简单剪切作用，也有剪切方向改变的纯剪切作用。因此，不称职地层中的13EA鞘褶皱破坏了其原始形态，并转变为等斜无根褶皱。这种韧性流褶皱常见于高压变质带中的泥质片岩中，由这种韧性流产生的石英组构在库木伊科坦带中被研究过。Kamuikotan带泥质片岩中的流体包裹体流体包裹体指示了跨越韧性-脆性边界的变形阶段。泥质岩石的韧性流动是形成类似蛇纹岩熔体的蛇纹岩基质的构造混杂岩系的重要因素。在3kb和5kb(250ﾟC)条件下，进行了约2周的合成铁闪锌矿的初步实验研究。但产物为铁蒙脱石和蒙皂石+石榴石。要完成实验研究，需要13EA或实验持续时间超过一个月，但对于5kb的如此长时间的实验工作，微型反应器的强度不够。因此，高压韧性流变质反应的实验研究是一个值得进一步研究的课题。

Summarized is deformation style of pelitic schists in the high pressure metamorphic belts such as the Kamuikotan Belt, Sangun Belt, and New England Fold Belt, and New England Fold Belt (Australia). Especially, sheath fold found in the New England Fo13EA\ : ld Belt was studied in detail. The sheath fod is precisely tongue-like fold, i.e., deformed of modified sheath fold and the fold is considered to have been produced not only by simple shear but also by pure shear with shear directional change. Thus, 13EA\ : sheath fold in incompetent layrs were destroied their original form and the fold transformed to isoclinal rootless fold. Such fold showing ductile flow is often observed in pelitic schists in the high pressure metamorphic belts.Quartz fabrics produced by such ductile flow were examined in the Kumuikotan Belt. Fluid inclusions in the pelitic schists of the Kamuikotan Belt. The fluid inclusions indicate a deformation phase crossing a ductile-brittle boundary. Ductile flow of13EA\ : pelitic rocks is important in formation of tectonic melange similar as serpentinite matrix of serpentinite melange.Preliminary experimental study for synthesis of Fe-pumpellyite was attempted at 3kb and 5kb(at 250ﾟC) for about 2 weeks. However, run products were ferroan smectites and smectite + garnet. To complete experimental study, over one month is required f13EA\ : or the experimental duration.But, the micro-reactor is not strong enough for such a long period experimental work at 5kb. Therefore, the experimental study of metamorphic reaction with ductile flow at high pressure is a subject of further study.