论文部分内容阅读
卡尼湾（Ｃａｎｎｉｖａｎ）干谷的钼矿床以网状脉化和矽卡岩化为特征。然而不同的围岩有明显不同的矿物组合。在卡尼湾岩株中，辉钼矿产于典型的石英，钾长石或石英－白云母脉中。在围岩中，辉钼矿产于绿泥石＋黄铁矿＋磁铁矿中，其中包含有不同量的石英、方解石和绿帘石。包含于石英和萤石中的原始流体包裹体有水溶液、液体ＣＯ＿２和气体ＣＯ＿２（平均Ｘｃｏ＿２＝０．０５）。显微测温术和拉曼光谱分析表明挥发分的主要成分是ＣＯ＿２。在水中的初熔温度表明ＮａＣｌ是主要溶解盐。最终的ＣＯ＿２－笼形化合物熔点表明ＮａＣｌ相对水的含量为２％～７ｗｔ％，均一温度为２９６～３１９℃。从Ｐ－Ｔ图看，四个绿泥石单变线在温度为３００℃±２０℃、压力为（１５００±３００）×１０￣５ｐａ时，与四条流体包裹体等容线相交，这可能是辉钼矿形成的温度、压力。卡尼湾干谷围岩矿脉中的矿物平衡表明，辉钼矿形成时的ｆｏ＿２和ｆｏ＿２在黄铁矿＋磁铁矿＋磁黄铁矿和黄铁矿＋磁铁矿＋赤铁矿缓冲层之间、在钼钙矿之上，方解石－辉钼矿组合的形成表明成矿流体中即使有少量ＣＯ＿２也使辉钼矿的稳定范围扩大到较高的氧逸度。
Molybdenum deposits in the dry valley of Cannivan are characterized by reticulation and skarnization. However, different rock masses have distinctly different mineral assemblages. In the kani bay strain, molybdenite is produced in typical quartz, potash feldspar or quartz-muscovite vein. In the surrounding rock, molybdenite is produced in chlorite + pyrite + magnetite, which contains different amounts of quartz, calcite and epidote. The original fluid inclusions contained in quartz and fluorite have aqueous solution, liquid CO 2 and gaseous CO 2 (average Xco 2 = 0.05). Micro-thermometry and Raman spectroscopy showed that the main component of volatiles was CO 2. The initial melting temperature in water indicates that NaCl is the major dissolved salt. The final melting point of the C0 2 clathrate indicates that the relative water content of NaCl is 2% to 7% by weight and the homogenization temperature is 296 to 319 ° C. From the P-T diagram, the four chlorite line change at the temperature of 300 ℃ ± 20 ℃, the pressure of (1500 ± 300) × 10 ~ 5pa, intersecting with the four fluid inclusion isomerism line, which may be Molybdenite formation temperature, pressure. The mineral balance in the drywall veins of the Qiangtu kani bay shows that fo_2 and fo_2 in the formation of molybdenite are dominant in pyrite + magnetite + pyrrhotite and pyrite + magnetite + hematite buffer The formation of the calcite-molybdenite assemblage above the molybdenite indicates that even a small amount of CO 2 in the ore-forming fluid expands the stable range of molybdenite to a higher oxygen fugacity.