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

通过这次研究，我对龙须草和混交藻有了以下新的认识和认识。1.橄榄岩(巨型海底滑坡体)位于对马泰曙群的巨型海底滑坡体，具有自下而上地质构造的特征变化：(1)底部以下注入砂岩和席状物，(2)底部上方低角度正断层，(3)平缓闭合褶皱，(4)卧式褶皱和低角度逆冲，(5)箱状无根褶皱，(6)杂乱无章的滑坡带。这种结构的变化可以作为区分蛇绿岩和构造混杂岩的一个标准。2.沿喜马拉雅主干中央逆冲(MCT)带出露的构造混杂岩片麻岩是一种在地壳中、深层沿板块边界发生俯冲变形的构造混杂岩类。其成因可能是片状浅色花岗岩内部的缓慢冷却和剪切作用，小喜马拉雅地区准原地滑脱推覆构造混杂岩具有典型的碎裂颗粒旋转结构。MCT沿线片麻岩中的石榴石也具有旋转结构，即雪球结构。旋转结构很可能是沿低角度逆冲剪切带的一种特征，并可能成为区分构造混杂岩和滑脱混杂岩的标志。

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.