Indium concentration in zinc ores in plutonic and volcanic environments: examples at the Dulong and Dachang mines, South China

作者：Shunsō Ishihara, Hiroyasu Murakami, Xiaofeng Li · 发表于：BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN · 年份：2011 · DOI：10.9795/bullgsj.62.259 · 被引用次数：32 · 研究领域：Geochemistry and Elemental Analysis、Extraction and Separation Processes、Geochemistry and Geologic Mapping

Two largest indium ore deposits of 5,000 tons In class in China, Dulong and Dachang mines, studied geochemically. The Dulong deposits have 1000In/Zn value of 4.1 in the average, which is milar to 2.6 of the Changpo-Tongkeng orebody and 3.1 of the Longtaoshan orebody of the Dachang Yet the Dulong ores are depleted in silver and antimony, and enriched in tungsten among the ore while the Dachang ores are rich in silver and antimony similarly to the Toyoha ores occurring in volcanogenic Green Tuff belt in Japan. Concentration of indium in sphalerites is homogeneous in the ores but is strongly banded in the Toyoha ores. It is suggested that the Dulong ore deposits were in a plutonic environment related to S-type ilmenite-series granite, while the Dachang deposits formed at shallower level, related to subvolcanic intrusions. A volcanogenic environment is neces