二朗评群蛇绿岩的形成环境是一具长期争议的问题，而此问题对于认识秦岭造由带的演化史具有重大的意义．本文通过对二朗坪群蛇绿岩中的重要组成部分细碧岩－石英角斑岩组俣的研究，认为：（１）弧后引张是形成该蛇绿岩的机制；（２）块状硫化物矿床与该蛇绿岩有着内在的联系． Second, the formation of the age group Orogenic ophiolites environment is a long-standing controversial issue, and the problem for understanding the evolution of Qinling made by the belt of great significance. In this paper, through the study of the diatomite-quartz horn porphyry, which is an important part of the Erlang Pingqu ophiolite, it is considered that: (1) the extension of the arc is the mechanism of forming the ophiolite; (2) the block The sulfide-like deposits are intrinsically linked to the ophiolite.