Geochemistry and petrogenesis of the Kuoerzhenkuola intruded-subvolcanic intermediate complex in Sawuershan, Xinjiang

The Kuoerzhenkuola intermediate intruded subvolcanic complex located in the eastern Sawuershan, the north-western margin of the Zhungaer Basin, Xinjiang, was formed in the Late Palaeozoic Era island arc. The intruding sequence of this complex is: the diorite of the deep-seated phase—the dioritic porphyry of the shallow-seated phase—the pyroxene andesite porphyry of the subvolcanic phase—the pyroxene andesite cryptoexplosion breccia—the albite porphyry, which is basically decided according to the intruding contact relations and the characteristics of the captured bodies from field geology. The original rock is similar to the andesite porphyry of the Sawuershan formation of the Middle Devonian. But a little basaltic magma is interfused during the process transforming from extrusion to extension in collision orogenic anaphase.Thus the petrochemical compositions of the subvolcanic rock are partially basic, the ∑REE grosses declined from 103.77×10~(-6) to 64.10×10~(-6), and the HREE contents comparatively heightened:LREE/HREE value declined from 2.49 to 1.66. The andesite cryptoexplosion breccia pipe of the complex is the volcanic apparatus directly controlling the mineralization and alteration of the gold deposit.