甘孜-理塘结合带中段非史密斯地层的划分及组分特征

甘孜-理塘结合带内各种构造岩片(块)均遭受不同程度的变质变形,属于整体无序、局部有序的非史密斯地层,通过查明各类岩片(块)的岩石组合、来源、时代、变形变质及裂解、运移、拼合、定位历程,重新定义了“理塘蛇绿岩群”的含义,并新命名为“理塘蛇绿混杂岩群”。按结合带内岩块的不同组分、不同来源、不同时代、不同变形变质程度的不同,对各类岩块进行四维裂解拼合复原后划分为两个岩组(卡尔蛇绿岩组、瓦能蛇绿岩组)及碎屑岩、大理岩等组成的5类外来岩块。这对于进一步研究甘孜-理塘结合带的造山机制及构造演化历程有着十分重要的意义。

Division and composition of the non-Smithian strata in the middle part of the Garze-Litang suture zone, western Sichuan

The tectonic slices (blocks) within the Garze-Litang suture zone, western Sichuan have been (subjected) to metamorphism and deformation, and may be assigned to generally ordered and locally disordered non-Smithian strata. In the light of rock association, origin, age, deformation and metamorphism, disintegration and collage, migration and displacement, the "Litang Ophiolite Group" is redefined as the "Litang Ophiolitic Melange Group", which may be redivided into two formation complexes, i.e. the Kar Ophiolite Formation and Waneng Ophiolite Formation and five types of exotic blocks composed of clastics and marbles. The result of research in this study is believed to be significant for the future study of orogenic mechanisms and tectonic (history) of the Garze-Litang suture zone, western Sichuan