摘要
在分析流体包裹体特征的基础上，提出锡铁山铅锌矿床两种矿石类型成矿流体的特点：条带状矿石具有中低温度（182℃-229℃），低盐度或较低盐度（5．3％-21．9％），密度小于1×10^3kg／m^3，弱酸、弱还原环境；块状矿石具有中高温（224．5℃-341℃）,较高盐度（22．8％-34．7％），密度大于1×10^3kg／m^3，中性、弱还原环境。两种不同类型的矿石也说明了该矿床具有两个不同成矿期次的热液：火山喷流沉积成矿热液在裂谷凹陷盆地富集形成务带状矿石；火山作用期后热液叠加改造前者形成块状矿石。两个不同成矿期次的热液造成锡铁山矿床的矿体和矿石的多样性。
On the base of fluid inclusion analyses, two ore forming fluids are deduced from ores of Xitieshan Pb - Zn deposit. Banded ores are formed in middle - low temperature （ 182℃-229℃ ）, low salinity （5.3% -21.9% ）, density 〈 1 × 10^3kg/m^3, weak acid, and weak reduction environment condition. Massive ores are formed in middle - higher temperature （ 224.5℃ - 341℃）, higher salinity （22.8%-34.7% ）, density 〉 1 × 10^3 kg/m^3, neutral, and weak reduction environmental conditional. Two type ores show that there are two different ore - forming fluids. Banded ores are formed in rift depression basin by volcanic spout hydrothermal fluids. Massive ores are formed by post - volcanic hydrothermal fluids superimposed on banded ores. Two stage ore - forming fluids cause variousness of ores and orebodies in the Xetieshan lead - zinc deposit.
出处
《地质与勘探》
CAS
CSCD
北大核心
2006年第6期47-51,共5页
Geology and Exploration
基金
国家"十五"科技攻关项目"锡铁山
水口山深边部及外围隐伏铅锌银矿探查技术示范研究"(编号:2001BA609A-06-03)资助
关键词
铅锌矿床
流体包裹体
成矿环境
锡铁山
青海
lead- zinc deposit, fluid inclusion, metallogenic environment, Xitieshan, Qinghai
