【摘要】 新疆准噶尔西北缘萨吾尔山东部的阔尔真阔腊中性侵入-次火山杂岩体,形成于晚古生代岛弧构造环境.从野外宏观地质的侵入接触关系和捕虏体特征,基本厘定了该杂岩体的活动顺序为:深成相闪长岩—浅成相闪长玢岩—次火山岩相辉石安山玢岩—辉石安山质隐爆角砾岩—钠长斑岩.其源岩物质与中泥盆统萨吾尔山组安山玢岩相同,但在碰撞造山作用后期向伸展构造背景转换过程中,伴有少量玄武质岩浆混入,造成次火山岩类的岩石化学成分偏基性,稀土总量从103 77×10-6降至64 10×10-6,重稀土含量相对增高,即LREE/HREE值从2 49降至1 66.该杂岩体的安山质隐爆角砾岩筒是直接控制该地区金矿化蚀变作用的火山机构.更多还原

【Abstract】 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.更多还原