摘要
齐Ⅲ金矿位于西准噶尔安齐断裂上盘,与西部哈图、齐Ⅱ金矿及东部齐IV、宝贝、灰绿山金矿构成哈图成矿带。赋矿凝灰岩、凝灰质泥岩及凝灰质粉砂岩发育白云母化、硅化、碳酸盐化和黄铁矿化蚀变。成岩成矿过程可分为草莓状黄铁矿阶段(I)、白云母-石英阶段(Ⅱ)、孤立黄铁矿阶段(Ⅲ)、硫化物-自然金阶段(Ⅳ)、方解石-黄铁矿阶段(V)、铁白云石-钠长石阶段(Ⅵ)和石英-方解石阶段(Ⅶ)。含砷黄铁矿的As与S含量呈负相关,晚期黄铁矿几乎不含砷。稀土元素模式为右倾,Cs,Rb,La,Ce,Ti,V,Cu,Zn在强蚀变凝灰岩中亏损,说明它们被热液从围岩中萃取迁移带出,Cr,Ni,Mo被流体带入围岩。硫化物-自然金阶段(IV)形成温度为301℃~340℃,硫逸度logf(S2)为-8.1^-10.8,其值高于哈图金矿低于东部宝贝金矿,暗示由西向东成矿深度逐渐变深。
Qi-IIl gold deposit, along with Hatu and Qi-ll in the west and Qi-IV, Baobei and Huilvshan in the east, consti- tute Hatu metallogenic belt. The host tuffaceous rocks were widely altered by sericitization, silicification, carbonation, py- ritization and arsenopyritization. The diagenetic and ore-forming process can be divided into seven stages： framboid stage （I）, muscovite-quartz stage （II）, isolated pyrite stage （II1）, sulfide-gold stage （IV）, calcite-pyrite stage （V）, ankerite-albite stage （VI） and quartz-calcite stage （VII）. The content of arsenic in hydrothermal pyrite has negative relationship with the content of sulfur. Pyrites in stage V contain nearly no arsenic. The tufts with distinct alteration intensity are enriched in LREE. All intensely altered samples are depleted in Cs, Rb, La, Ce, Ti, V, Cu and Zn, suggesting remobilized by hydro- thermal fluids. Cr, Ni and Mo were taken into the host rock by fluid. The temperature of sulfide-gold stage （IV） is 301℃ - 340℃, and the sulfur fugacity is -8.1- -10.8, higher than Hatu but lower than Baobei gold deposit, implying that the depth of ore become deeper from west to east.
出处
《新疆地质》
CAS
CSCD
北大核心
2013年第4期295-305,共11页
Xinjiang Geology
基金
国家国际科技合作项目(2010DFB23390)资助
关键词
西准噶尔
齐III金矿
成矿阶段
元素迁移
West Junggar
Qi-Ill gold deposit
Ore-forming stages
Element migration
作者简介
作者E—mail：wangleilzupku@gmail．com第一作者简介：王磊（1987-），男，甘肃兰州人，北京大学地球化学专业在读博士研究，从事矿床地球化学研究
