地质学报2016，Vol.90Issue(2)：352-360,9.
内蒙古东升庙和炭窑口多金属硫化物矿床铁同位素地球化学特征及其成矿指示意义
Fe Isotopic Characteristics of the Dongshengmiao and the Tanyaokou Polymetallic Sulfide Deposits in Inner Mongolia and Their Metallogenic Significance
摘要
Abstract
Here we report the iron isotopic compositions of pyrites and chalcopyrites from the Dongshengmiao and the Tanyaokou deposits in the Langshan area.Theδ56 Fe results of irregularly shaped pyrites from graphite-rich mica schists vary from + 0.04‰ to + 1.11‰,indicating partial oxidation of Fe2 + in an oxygen-limited environment and the conversion to pyrites during diagenesis.While the δ56 Fe results of pyrites and chalcopyrites from the ores vary from -1.33‰ to +0.08‰,indicating a hydrothermal origin. In addition,the δ56 Fe results of vein pyrites from graphite-rich mica schists vary from - 0.39‰ to-0.04‰,which lie between the values of irregularly shaped pyrites and ore pyrites,suggesting mixture of hydrothermal fluids and the early irregularly shaped pyrites. The totally different iron isotopic compositions between irregularly shaped pyrites from graphite-rich mica schists and ore sulfides in the Dongshengmiao deposit indicates that hydrothermal fluids didn’t contribute to irregularly shaped pyrite, therefore it is unlikely that synsedmentary hydrothermal activities account for the mineralization in the Dongshengmiao deposit.Combining with the common silicified dolomite marble fragments in the top and bottom part of dolomite marble-hosted sulfide orebody,we suggested that epigenetic mineralization is the main ore-forming form.Besides,the similiarity in iron isotopic characteristics of ore sulfides from the Dongshengmiao and the Tanyaokou deposits indicates the similarity of their metallogenic material sources.关键词
东升庙矿床/炭窑口矿床/黄铁矿/黄铜矿/铁同位素/成矿过程Key words
the Dongshengmiao deposit/the Tanyaokou deposit/pyrite/chalcopyrite/Fe isotope/mineralization processes引用本文复制引用
高兆富,朱祥坤,高文革,王炳林,孙剑,罗照华,包创,唐超..内蒙古东升庙和炭窑口多金属硫化物矿床铁同位素地球化学特征及其成矿指示意义[J].地质学报,2016,90(2):352-360,9.基金项目
本文为国土资源部地质调查项目（12120113015700）资助的成果。 （）
