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| 阿尔泰南缘克兰盆地的脉状金-铜矿化及其流体演化 | |
| 引用本文： | 徐九华,肖星,迟好刚,王琳琳,林龙华,禇海霞,龚运辉.阿尔泰南缘克兰盆地的脉状金-铜矿化及其流体演化[J].岩石学报,2011,27(5):1299-1310. |
| 作者姓名： | 徐九华 肖星 迟好刚 王琳琳 林龙华 禇海霞 龚运辉 |
| 作者单位： | 1. 北京科技大学资源工程系,北京,100083 2. 招远黄金集团公司,招远,265419 3. 吉林大学地球科学学院,长春,130061 |
| 基金项目： | 本文受国家自然科学基金项目(40972066、40672060)、国家科技支撑计划项目(新疆305项目2007BAB25B01)和中国科学院地质与地球物理研究所开放基金联合资助. |
| 摘 要： | 阿尔泰山南缘泥盆纪克兰火山-沉积盆地蕴藏有丰富的VMS锌铅铜多金属矿床。自晚泥盆世至早二叠世末, 阿尔泰山南缘为NE-SW向强烈挤压的构造环境, VMS矿石受到变形变质改造,脉状金铜矿化发育。金(铜)石英脉主要有2种产状:(1)白色-灰白色(硫化物)顺层石英脉(QI), 产于韧脆性剪切带发育地段,呈细脉状或透镜状产于绿泥片岩、黑云片岩中;(2)斜切黄铁矿化蚀变岩、层状铅锌矿和变质岩产状的黄铜矿-黄铁矿石英脉(QII),与晚期的脆性构造有关。金(铜)石英脉的流体包裹体发育,按室温下相态特征有3类。第I类为含子矿物的高盐度包裹体(L-V-S型),子晶为NaCl, 有时为KCl,包裹体呈孤立或无序分布,代表变质早期流体特征。一般NaCl子晶先消失(210~357℃),包裹体的最终均一温度369~512℃,其捕获温度与变质相的相平衡计算温度相当,反映了变质早期中高温热液活动的特征。第II类是富CO2 包裹体,包括单相的碳质流体包裹体(L CO2、L CO2-CH4或L CO2-N2)和两相富CO2包裹体(L CO2-L H2O)2个亚类。碳质流体包裹体是常见类型,有时与L CO2-LH2O型伴生,在较晚期的黄铜矿-黄铁矿石英脉中表现为原生特征,而在较早的石英脉中常表现为次生特征。萨热阔布的碳质流体可分为纯CO2包裹体和CO2-CH4体系包裹体,纯CO2包裹体的固体CO2熔化温度(Tm,CO2)为 -60~-56.5℃,CO2部分均一温度(Th,CO2) 变化于-23~+31℃;密度一般为0.85~0.89g·m-3。CO2-CH4包裹体的Tm,CO2＜-57℃,可低达-78.1℃,Th,CO2低达-33.7~-17.7℃, 其密度高达1.01~1.07g·m-3。VMS矿床中晚期叠加的黄铜矿石英脉中碳质流体包裹体可分为贫CH4-N2和富CH4-N2的CO2-CH4-N2包裹体,贫CH4-N2的碳质包裹体Tm,CO2=-63.3~-57℃,Th,CO2=-27.5~+29.7℃;富CH4-N2的CO2-CH4-N2包裹体Tm,CO2=-83.4~-65.5℃,Th,CO2=-56.0~+16.9℃。铜金石英脉中与碳质流体共生的LCO2-LH2O型包裹体均一温度Th,total=205~370℃,略低于第I类高盐度包裹体的Th,total=369~512℃。据CO2流体高温高压相图估算包裹体的捕获压力至少为110~300MPa。金(铜)石英脉的主体在相当于445~566℃的高温条件下形成的,而金铜矿化则是在高于205~370℃、110~330MPa的中高温中深条件下发生的。流体包裹体的δ18O为7.54‰~11.84‰ (QI)和3.82‰~7.82‰ (QII), δD为-84.7‰~-98.2‰(QI)和-75.8‰~-108.8‰ (QII)。结合地质特征和流体研究,说明成矿热液来源与区域变质及相关的岩浆活动有关。 |
| 关 键 词： | 脉状金-铜矿化 流体包裹体 克兰盆地 阿尔泰 |
| 收稿时间： | 2010/11/20 0:00:00 |
| 修稿时间： | 2011/2/25 0:00:00 |
Fluid inclusion study on gold-copper mineralization in Lower Devonian strata of the Kelan basin, Altay, China. |
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| XU JiuHu,XIAO Xing,CHI HaoGang,WANG LinLin,LIN LongHu,CHU HaiXia and GONG YunHui.Fluid inclusion study on gold-copper mineralization in Lower Devonian strata of the Kelan basin, Altay, China.[J].Acta Petrologica Sinica,2011,27(5):1299-1310. | |
| Authors: | XU JiuHu XIAO Xing CHI HaoGang WANG LinLin LIN LongHu CHU HaiXia and GONG YunHui |
| Institution: | Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;Zhaoyuan Gold Industry Group, Zhaoyuan 265419, China;College of Earth Science, Jilin University, Changchun 130061, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China |
| Abstract: | The southern margin of the Altay had undergone intensive NW-SE compression since the Late Devonian to the Early Permian,which resulted in syn-orogenic metamorphism,deformation and hydrothermal mineralization.This was another important mineralizing epoch after the Early Devonian VMS mineralization.Not only had VMS ores undergone deformation and metamorphism,but also gold-copper-bearing sulfide-quartz veins formed during orogeny or post-orogeny.These quartz veins can be divided into two groups.The first group... |
| Keywords: | Vein gold-copper mineralization Fluid inclusions Kelan basin Altay |
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