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园珠顶大型铜钼矿床位于大瑶山隆起北缘、粤桂交界的广东省封开县境内。铜钼矿化普遍发育于斑岩体及其外接触带中,岩体内部见星点状黄铁矿、黄铜矿、辉钼矿分布,但铜钼工业矿体主要产于岩体外接触带中,并围绕着岩体具椭圆形环状矿化分带特征,由内向外依次为钼矿化带→铜钼矿化带→铜矿化带,成矿作用与二长花岗斑岩有关。运用高分辨率和高灵敏度离子探针和Re-Os分析技术,作者分别对矿区二长花岗斑岩和矿体进行了年代学研究,获得二长花岗斑岩的锆石U-Pb SHRIMP年龄为154±2Ma(95%可信度,MSWD=0.75,N=11),铜钼矿体辉钼矿Re-Os等时线年龄为155±5Ma(95%可信度,MSWD=0.31,N=8),表明圆珠顶斑岩型铜钼区的成岩成矿作用都发生于中侏罗世晚期,成矿作用发生于华南拉张大地构造背景下。
Park bead top large copper and molybdenum deposits located in the northern edge of Dayaoshan uplift, Guangdong and Guangxi at the junction of Fengkai County. Copper-molybdenum mineralization generally occurs in the porphyry body and its outer contact zone, and the inner part of the rock mass is characterized by the distribution of astral pyrite, chalcopyrite and molybdenite, but the copper-molybdenum industrial orebody is mainly produced outside the rock mass Belt, and around the rock with oval ring mineralization zoning characteristics, from the inside to the outside of the molybdenum mineralization → copper and molybdenum mineralized belt → copper mineralized zone, mineralization and two long granite porphyry related. Using high-resolution and high-sensitivity ion probes and Re-Os analysis techniques, the authors conduct a chronological study of the monzonitic granite porphyry and ore bodies, respectively, to obtain the zircon U-Pb SHRIMP of the monzonitic granite porphyry The age of 154 ± 2Ma (95% confidence, MSWD = 0.75, N = 11) and the Re-Os isochron age of the molybdenum molybdenite ore was 155 ± 5Ma (95% confidence, MSWD = N = 8), indicating that diagenesis and mineralization occurred in the late Middle Jurassic and the mineralization took place in the tectonic setting of the extension of the southern China.