Tectonic occurrence and emplacement mechanism of ophiolites from Luobusha-Zedang, Tibet.
西藏罗布莎-泽当蛇绿岩体的构造产出与侵位机制探讨

Detailed field research and fabric studies have been done on the Luobusha-Zedang ophiolite, one of the most typical parts in the Yarlung Zangbo suture, Tibet. Based on the distribution and contact relationships between ophiolite and different strata, two regional ductile shear zones (DFT and DFR) and their properties are confirmed. They are respectively southern and northern main faults limiting ophiolite. During the emplacement of Luobusha-Zedang ophiolite, DFT is identified to have gone through two stage tectonic movements, i.e. obduction from north to south at the initial emplacement stage and overturned thrust from south to north at the later reactive stage. DFT formed much earlier than DFR and they are not thought to be counter thrusts of MCT from Himalaya orogenic belt. Furthermore, we propose a new model for the emplacement evolution of Luobusha-Zedang ophiolite and provide new evidences for the discussion of emplacement mechanism.