西天山吐拉苏-也里莫墩金成矿带简述

吐拉苏一也里莫墩矿带是西天山地区重要金矿成矿区.矿带内金矿赋存于晚古生代中期拉张(裂谷)环境下形成的早石炭世火山岩带内,金矿围岩为下石炭统大哈拉军山组陆相火山岩,成矿时代为早石炭世杜内-韦宪早期.矿带内金矿化可分为浅成低温热液系统(冰长石-绢云母型、硅化岩型)、斑岩型和沉积砾岩型.矿带内东、西两段控矿构造有差异:西部吐拉苏地区的阿希、京希开布拉克、伊尔曼得等金矿产于京希一阿希近南北向火山构造拗陷带内的火山机构构造系统(冰长石-绢云母型)和层间裂隙带(硅化岩型)中;东部也里莫墩地区的加特曼、铁列克特、小于赞等金矿床(点)产于吾拉斯台-郎布拉近东西向火山构造隆起带内的次火山穹丘构造系统中.

GEOLOGY OF TULASU-YELIMODUN GOLD MINERALIZATION BELT, WESTERN TIANSHAN, XINJIANG

Tulasu-Yelimodun ore belt is an important gold metallogenic area. The gold deposits in the ore belt occur in an Early Carboriiferous volcanic rock belt formed under an extension (rift) environment during the middle stage of Late Paleozoic. The host rock of the deposits is continental volcanic rock of Dahalajunshan formation, Lower Carboniferous. The metallogenic epoch is Early Toumaisian-Visean of Early Carboniferous. The gold mineralization can be classified into epithermal system (including adularia-sericite type and silicified rock type), porphyry type and sedimentary conglomerate type. The ore-controlling structures are different from the eastern to the western sections of the ore belt. The Axi, Jingxikaibulake, and Yiermende deposits of Tulasu area in the west are developed in volcanic apparatus within the Jingxi-Axi SN-trending volcano-tectonic subsidence (for adularia-sericite type) and in interlayer fracture zones (for silicified rock type). The Jiatemen, Tieliekete and Xiaoyuzan deposits of Yelimodun area in the east occur in subvolcanic domes within the Wulasitai-Longbula E-W-trending volcano-tectonic mole track.