Comparative study on structural geology of tectonic melange,olistostrome and mud volcano.

通过目前的研究，我获得了以下关于olistostrome和melange的新知识和新想法。1.巨型海底滑梯（巨型海底滑梯）位于对马岛太树群中的巨型海底滑梯，其底部到顶部的地质构造变化具有特征性。(1)基底下方砂堤和砂片的注入，(2)基底上方低角度正断层，(3)平缓封闭褶皱，(4)平卧褶皱和低角度逆冲，(5)箱形无根褶皱，(6)混沌滑塌球带。这种构造的变化可以作为区分板块与构造混杂岩的标准。2. 构造混杂岩沿喜马拉雅中央逆冲带暴露的奥根片麻岩是地壳中深部沿板块边界发生变形的一种构造混杂岩。它可能是由于片状浅色花岗岩内部缓慢冷却和剪切而形成的。小喜玛拉雅山副原生推覆带底部的构造混杂岩具有碎裂颗粒的旋转结构特征。沿MCT的片麻岩中的石榴石也具有旋转纹理，称为雪球纹理。旋转结构极有可能是低角逆冲剪切带的一个特征，并成为区分构造混杂岩与橄榄断层的标志。

As a result of present study,I obtained the following new knowledge and idea about olistostrome and melange. 1.Olistostrome(huge submarine slide) A huge submarine slide intercalated in the Taishu Group in Tsushima has a characteristic change of geologic structures from the base to the top.(1)injection of sand dyke and sheet below the base,(2)low-angle normal faults above the base,(3)gentle and closed folds,(4)recumbent folds and low-angle thrusts, (5)box-shaped and rootless folds,(6)chaotic slump-ball zone. This change of structures can be a criteria to distinguish olistostrome from tectonic melange. 2. Tectonic Melange Augen gneiss exposed along the Main Central Thrust(MCT) zone in the Himalayas is a kind of tectonic melange which has under-gone deformation along plate boundary in the middle to deep part of crust. It cane be originated by slow cooling and shearing of inner part of sheet-formed leucogranite.Tectonic melange on the sole of para-autochthonous klippe and nappe in the Lesser Himalayas has a characteristic rotation texture of cataclastic grains. Garnets in the gneiss along the MCT have also rotation texture,so called snow-ball texture. It is highly possible that rotation texture is a characteristic feature in the shear zone along low-angle thrust and become a criteria to distinguih tectonic melange from olistostrome.