CHARACTERISTICS OF FOUR SERIES OF GRANITOIDS IN THE QUXU BATHOLITH, TIBET, AND ITS TECTONIC SIGNIFICANCE

Seven superunits and six independent units are established for the disintegrated Quxu batholith. The batholith is composed of subduction M type, subduction I type, syn collision I type and syn collision S type granitoids. This paper mainly presents an introduction to the geological, petrological, petrochemical, geochemical and emplacement characteristics of those series of granitoids and discusses their tectonic significance. In addition, the author also puts forward some new ideas about the scale, nature and closing of the Neo Tethys ocean, the collision between the Indian plate and the Lhasa block and the mechanism for the uplift of the Qinghai Tibet plateau.