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黑龙江霍吉河钼矿床为大型斑岩型矿床,矿体赋存在花岗闪长岩体内。成矿过程包括石英-黄铁矿、石英-辉钼矿、石英-多金属硫化物以及石英-碳酸盐4个阶段。在矿床地质特征研究的基础上,对矿石辉钼矿进行了Re-Os同位素定年分析,获得模式年龄为176.9±2.4~178.7±2.4 Ma,加权平均值177.6±1.1 Ma,等时线年龄176.6±3.2 Ma,表明霍吉河钼矿床形成于早侏罗世晚期。含矿花岗闪长岩的硅含量较高,富碱,里特曼指数为2.19~3.78,A/CNK为1.05~1.12,属于弱过铝质高钾钙碱性系列。稀土元素分布形式呈右倾型,轻、重稀土元素分馏明显。微量元素总体显示相对富集Ba、Th、U等大离子亲石元素,亏损Nb、Ta、Ti、P等高场强元素。成岩成矿动力学背景为燕山早期古太平洋板块向欧亚大陆俯冲的陆缘弧。
The Huojihe molybdenum deposit in Heilongjiang is a large porphyry deposit, and the ore body exists in the body of granodiorite. The metallogenic process includes four stages: quartz-pyrite, quartz-molybdenite, quartz-polymetallic sulphide and quartz-carbonate. Based on the study of the geological characteristics of the ore deposit, the Re-Os isotopic dating of ore molybdenite has been carried out. The model age is 176.9 ± 2.4 ~ 178.7 ± 2.4 Ma, the weighted average is 177.6 ± 1.1 Ma and the isochron age is 176.6 ± 3.2 Ma, indicating that the Huojihe molybdenum deposit was formed in the early Jurassic. The content of silicon in the ore-bearing granodiorite is high and its alkali content is relatively high. The Ritman index is 2.19 ~ 3.78 and the A / CNK is 1.05 ~ 1.12, belonging to the series of weak permanganate high-K calc-alkaline. Rare earth elements in the form of right-dumping, light, heavy REE fractional distillation obvious. Trace elements generally show relatively enrichment of large ion lithophile elements such as Ba, Th, U and depletion of high field strength elements such as Nb, Ta, Ti and P. Diagenetic mineralization kinetic background for the early Yanshanian Paleo-Pacific plate subduction continental Eurasian continental arc.