Chemical composition of regularly interstratified chlorite/smectite in the ores from some Neo-gene gold-silver vein-type deposits in Japan

Mining geology Pub Date : 1989-06-30 DOI:10.11456/SHIGENCHISHITSU1951.39.215_181

T. Yoneda, Takashi Watanabe

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引用次数: 5

Abstract

Chemical composition of regularly interstratified chlorite/smectite in the ores from some Neogene gold-silver vein-type deposits in Japan.By Tetsuro YONEDA** and Takashi WATANABE*** Abstract: Regularly interstratified chlorite/smectite mineral occurs widely as a gangue mineral in epithermal goldsilver-quartz veins, associated closely with base-metal sulfides and occasionally with Mn minerals. The chlorite/smectite mineral from six gold-silver vein deposits, that is, Konomai, Todoroki, Chitose, Seigoshi, Omidani, and Kushikino was quantitatively analyzed by X-ray microanalyser. The chemical composition of the mineral reflects characteristic features of the ores. Mncontent of the mineral is relatively high and the correlation between Mg and Mn is obvious in the ores containing rhodochrosite, whereas it is very low in the ores free from Mn minerals. Moreover, the Mn/Fe ratio of the mineral varies widely corresponding to the Mn/Fe ratio of coexisting sphalerite. It is infered that the stability and the variations in chemical composition of the regularly interstratified chlorite/smectite mineral appear to be influenced by temperature and chemical composition of ore-forming fluid.

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日本一些新第三纪金银脉型矿床矿石中规则层间绿泥石/蒙脱石的化学组成

日本新近纪金银脉型矿床中规则层间绿泥石/蒙脱石的化学组成。摘要/ Abstract摘要:绿泥石/蒙脱石矿物作为脉石矿物广泛赋存于浅成热液型金银石英脉中，与贱金属硫化物密切伴生，偶尔与锰矿物伴生。采用x射线微量分析仪对小野、东多木、千岁、Seigoshi、Omidani和Kushikino 6个金银脉矿床的绿泥石/蒙脱石矿物进行了定量分析。矿物的化学成分反映了矿石的特征。含菱锰矿的矿石锰含量较高，镁锰相关性明显，不含锰矿的矿石锰锰含量很低。同时，该矿物的Mn/Fe比值随共存闪锌矿的Mn/Fe比值变化较大。结果表明，有规则层间的绿泥石/蒙脱石矿物的稳定性和化学成分的变化可能受到温度和成矿流体化学成分的影响。

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Mining geology

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