THE CHARACTERISTICS OF UPPER PALEOZOIC ADULARIA SERICITE TYPE OF AXI GOLD DEPOSIT,XINJIANG
THE CHARACTERISTICS OF UPPER PALEOZOIC ADULARIA SERICITE TYPE OF AXI GOLD DEPOSIT,XINJIANG
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发表时间：
1999
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通讯作者：
Wu Rui
中科院分区：
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作者：
Wu Rui
阿希金矿床位于新疆西天山北部，属哈萨克斯坦板块伊犁中天山陆壳。产于伊犁地区上古生界吐拉苏火山盆地。矿区主要分布大哈拉军山组第五岩性段火山岩，包括安山岩、英安岩、火山角砾岩、火山团岩、含弹火山角砾岩、流纹英安岩、凝灰岩、凝灰岩、结晶岩屑凝灰岩、粗安山岩等。 阿恰勒河组第一岩性段少量发育砾岩矿区内还出现灰绿色凝灰岩长石玢岩、闪长玢岩、石英安山玢岩、长孢岩。阿恰勒河组是一套覆盖在大哈拉军山组之上的陆相海相沉积岩。矿区内以北西向、东西向走向的断裂构造为主，其次为受火山机构控制的弓形、放射状断裂。矿区发育许多火山喷口。矿体为含金石英脉，位于破火山口之一附近，受南北断层控制。矿物组合有黄铁矿、白铁矿、毒砂、闪锌矿、黄铜矿、方铅矿、磁黄铁矿、多碱矿、瑙曼石、克劳斯铁矿、金银矿、金、锌、四面体、斑铜矿、镜铁矿、褐铁矿、石英、绢云母、白云母、伊利石、水白云母、方解石、白云母、绿泥石、玉髓、蒙脱石等。围岩蚀变有硅化、绢云母化、绿泥石化、碳化、白云母化、钠长石化等。成矿时代为下石炭统。成矿温度为81~260℃。成矿流体矿化度在0 35%~9 6%之间。 lg f O 2 介于-37~-39之间。因此阿溪金矿床属于浅成热液型阿杜拉绢云母矿类型。
Axi gold deposit, located in the north part of western Tianshan, Xinjiang, belongs to Yili center Tianshan continental crust of Kazakhstan plate. It occurs in Upper Paleozoic Tulasu volcanic basin in Yili area. The volcanic rocks of the fifth lithologic member in Dahalajunshan formation are distributed dominantly in the mining area, including andesite, dacite, volcanic breccia, volcanic agglomerate, bomb bearing volcanic breecia, rhyodacite, tuff, crystal tuff, crystal lithic tuff and trachyandesite.A little amount of the first lithologic member of Aqialehe formation including conglomerate and grey green tuff feldspathic litharenite,and diorite porphyrite, quartz andesite porphyrite and feldsporphyre also appears in the mining district. Aqialehe formation which is a suit of continental marine sedimentary rock overlays on the Dahalajunshan formation. In the mining district, the fault structure with strikes of NW and E W are dominant, the secondary ones are the arcuate and radial faults controlled by volcanic apparatus. Many volcanic vents develop in the mining district. The orebody, which is the kind of auriferous quartz vein, is located near one of the caldera and controlled by the fault striking S N. The mineral assemblage is pyrite, marcasit, arsenopyrite, sphaleyite, chalcopyrite, galena,pyrrhotite, polybasite,naumannite, clausthalite, electrum, gold, zinc, tetrahedrite, bornite, specularite, limonite, quartz, sericite, muscovite, illite, hydromuscovite, calcite, adularia, chlorite, chalcedony, montmorrillonite etc.The alterations of wallrock include silication, sericitization, chloritization, carbonation, adularization, albitization etc. The metallogenic epoch is Lower Carboniferous.The mineralizing temperature ranges between 81~260℃. The salinity of metallogenic of fluid is between 0 35%~9 6%. lg f O 2 is between -37~-39. So Axi gold deposit belongs to the type of epithermal hydrothermal adularia sericite.