Achievements and Prospects of Four 1:50 000 Regional Geological Survey Projects in Southwest Bangor County, Tibet

As a part of the special geological survey project of Qinghai-Tibet, the four 1:50 000 regional geological and mineral resources survey subprojects in southwest Bangor county have achieved some achievements. (1) The Cambrian volcanic rocks cover the Nyainqentanglha Group in angular unconformity and consist of three rock units, and the Upper Cambrian Taduoxiong Formation which is a new rock unit have been established. (2) The Furongian Longjiao Formation is detached from the Lower Ordovician Zhakang Formation. (3) A suite of sedimentary melange with stable regional extension have been found in the Yunzhug ophiolite melange belt during geological mapping, and termed as Late Jurassic Suoer Formation. (4) The basic rock unites, composing with ultramafic rocks, gabbro, sheeted dike complex, pillow basalt and radiolarian chert, which comprise the Late Jurrasic ophiolite suite are recognized. (5) A series of metamorphic granites from the Nyainqentanglha Group form in Meso-neoproterozoic and provide new data for tectonic thermal events study during formation and breakup of the Rodinia continental which take place on the north margin of ancient India shield.