河南栾川闪石玉的矿物学特征及成矿温度研究

Study on mineralogy and metallogenic temperature of Luanchuan Nephrite in Henan Province Zhao

河南洛阳栾川县近期发现有闪石玉矿体产出，具有一定的宝石学研究意义和商业价值。通过显微镜观察分析，栾川闪石玉的主要矿物成分为透闪石，一般含量在95%以上，其中以显微纤维状透闪石（60%～70%）为主，片晶透闪石占少部分（30%～40%），并含有少量杂质（少于1%）。该地产出的闪石玉中透闪石颗粒较大，结构较粗，欠细腻。运用均一法测定栾川闪石玉的成矿温度结果表明其气液包裹体以完全均一至液相方式为主,其均一温度变化范围为126℃～304℃，其平均值为194.21℃，说明栾川闪石玉矿为中低温成矿型矿床。

Recently nephrite mine was founded in Luanchuan County, Luoyang city, Henan province, which has big significance both in gem research and in commercial value as well.Through analysis under microscope, the main chemical composition of Luanchuan nephrite is tremolite, and its content is over 95%. Cryptocrystalline fibroid nephrite is accounted for the majority（60%-70%）, with leafy ballistic nephrite accounted for a small portion（30%-40%）, as well as a small amount of impurities（less than 1%）. The tremolite grain in Luanchuan nephrite is a little big in size, and its structure is somewhat coarse. By means of homogenization temperature tests, we come to the conclusion that the gas-liquid inclusions mainly homogenized to liquid form, their homogenization temperature ranges from 126℃ to 304℃, and its average homogenization temperature is 194.21℃, which supposes that the metallogenesis of Luanchuan nephrite is under intermediate or low temperature conditions.