摘要
从江那哥铜多金属矿床位于扬子陆块与华夏陆块过渡带上的江南造山带西南段,是本区多金属矿床的典型代表。为确定矿床的成矿流体来源,本文利用连续流动质谱和MAT-253等先进分析设备系统研究了矿床的S-H-O同位素组成。矿石硫化物的δ34SV-CDT值介于-2.7‰～2.8‰之间,均值为0.1‰,多数集中在-2.5‰～2.5‰之间,具有幔源硫特征,暗示成矿物质中硫来源于深部幔源;脉石石英包裹体的δDV-SMOW和δ18OH2O值,分别介于-60.7‰～-44.4‰之间和7.9‰～9.0‰之间,在δD和δ18O图解中,全部样品落入岩浆水和/或变质水范围内。S、H和O同位素结果表明存在地幔流体参与成矿,其赋矿浅变质沉积岩地层也为成矿提供了部分成矿流体。综合研究认为该矿床成矿流体具有多来源特征。
The Nage Cu multiple-metallic ore deposit is located in the transitional zone of the Yangtze craton and Cathaysia,which is the southwest of Jiangnan orogenic belt,and is a representative ore deposit of this region. Isotopic geochemistry of S,H and O is analyzed in this paper to help understand the sources of the ore-forming fluids. The δ34 SV-CDT values of the ores sulfides show a total range from -2.7‰ to 2.8‰,the average value is 0.1‰,and most of them are between -2.5‰ and 2.5‰,indicating that the sulfur should be originated from the mantle material. The δDV-SMOW and δ18OH2O values of the gangue quartz inclusion range from -60.7‰ to -44.4‰ and from 7.9‰ to 9.0‰,respectively. In the diagram of δD versus δ18O,all samples fall into the region of magmatic and/or metamorphic water,which means that the ore-forming fluids were provided by the mantle and/or the hosted-metamorphic sedimentary rocks. This work suggests that the mineralization fluids of this deposit have a characteristic of multiple sources.
出处
《地质与勘探》
CAS
CSCD
北大核心
2010年第3期455-461,共7页
Geology and Exploration
基金
国家重点基础研究发展计划(973计划)课题(2007CB411402)
中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金(2009014)
中科院地化所与贵州地矿局102队合作项目资助
关键词
同位素地球化学
成矿流体
那哥铜多金属矿床
isotope geochemistry
ore-forming fluids
Nage Cu Multiple-metallic ore deposit
