西天山古生代铜金多金属矿床类型、特征及其成矿地球动力学演化  

Types, Characteristics and Metallogenic Geodynamic Evolution of the Paleozoic Polymetallic Copper-Gold Deposits in the Western Tianshan Mountains

作　　者：王志良[1] 毛景文[1] 张作衡[1] 左国朝[2] 王龙生[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]甘肃省地质调查院,兰州730000

出　　处：《地质学报》2004年第6期836-847,共12页Acta Geologica Sinica

基　　金：国土资源大调查项目 (编号 2 0 0 413 0 0 0 0 2 6和 2 0 0 3 10 2 0 0 0 0 1-3 );国家重点基础研究项目 (编号 G19990 43 2 16)资助的成果

摘　　要：根据铜金矿床的含矿主岩和成矿作用方式 ,西天山的铜矿床主要可划分为 3种类型 :斑岩型、夕卡岩型和火山热液型 ;金矿床可划分为 2种类型 :浅成低温热液型和斑岩型。研究区从北到南可划分为 3条东西向的成矿带 :1阿拉套—科古琴铜多金属成矿带 ,分布着与中元古界灰岩和海西中期中酸性浅成侵入岩有关的斑岩 -夕卡岩铜矿、与海西中期酸性浅成侵入岩有关的斑岩型铜矿 ;2博罗科洛金多金属成矿带 ,分布着与下石炭统中酸性火山碎屑岩和中—基性熔岩有关的浅成低温热液型金矿、与海西中期中酸性浅成侵入岩有关的斑岩型金矿 ;3阿吾拉勒铜银多金属成矿带 ,分布着与二叠纪陆相中基性火山岩有关的火山热液型铜矿、与海西晚期中酸性浅成侵入岩有关的斑岩型铜矿。通过对西天山古生代的地球动力学演化探讨 ,认为上述 3条成矿带对应的大地构造单元分别为阿拉套—科古琴晚古生代岛弧带、博罗科洛晚古生代弧后盆地和阿吾拉勒二叠纪裂谷带。Based on ore-bearing host rocks and mineralization patterns of copper-gold deposits in the western Tianshan Mountains, copper deposits can be classified into three types, i.e. porphyry copper deposits, skarn copper deposits and volcanogene hydrothermal copper deposits; gold deposits can be grouped into two types, i.e. epithermal gold deposits and porphyry gold deposits. There exist three E-W-trending mineralization zones in the western Tianshan Mountains: ① the Alataw-Kokirqin copper polymetallic mineralization zone, which comprises porphyry-skarn copper deposits related to the Mesoproterozoic limestone and Mid-Hercynian hypabyssal medium-acidic intrusive rocks, porphyry copper deposits connected with Mid-Hercynian hypabyssal acidic intrusive rocks;② Boluokeluo gold polymetallic mineralization zone, which consists of epithermal gold deposits related to Lower Carboniferous medium-acidic pyroclastic rock and medium-basic lava, porphyry gold deposits connected with Mid-Hercynian hypabyssal medium-acidic intrusive rocks; ③Awulale copper-silver polymetallic mineralization zone, which is composed of volcanogene hydrothermal copper deposits related to Permian continental medium-basic volcanic rocks, porphyry copper deposits connected with Late-Hercynian hypabyssal medium-acidic intrusive rocks. Based on discussion on the Paleozoic geodynamic evolution in the western Tianshan Mountains, three mimeralization zones mentioned above are correspondent with the Alataw-Kokirqin Late Paleozoic island arc zone, the Boluokeluo Late Paleozoic back-arc basin and the Awulale Permian rift zone respectively.

关 键 词：西天山 侵入岩 成矿带 斑岩型铜矿 地球动力学 晚古生代 海西 二叠纪 演化 大地构造单元 

分 类 号：P618.2[天文地球—矿床学]