摘要
从分析矿床宏观与微观两方面特征入手,应用包裹体矿物学、同位素地质学、地质统计学以及稀土元素地球化学等理论与方法,论述了凡口铅锌矿成矿的多大地构造演化阶段以及多因素控矿、多物质来源、多期次、多成矿作用方式等特点:矿物包裹体均一温度峰值分别在120,150,200℃;铅同位素年龄大致分为3组:340～390Ma,260～290Ma,140～190Ma,成矿元素铅有深部来源的特点,并可能在深部铅上升过程中混有部分上地壳物质;主容矿地层黄铁矿δ34S为+16.5‰,矿石中黄铁矿δ34S为+13.6‰～+25.8‰,显示硫来源主要是泥盆纪同时代海水硫;矿石矿物中含有少量的高温矿物,围岩蚀变有弱硅化、绿泥石化、白云石化及细脉状黄铁矿化等,说明成矿物质有相当一部分来源于岩浆源或幔源。认为凡口铅锌矿床属于典型的多因复成矿床.
From the macrocosmic and microcosmic characteristics of the deposit and in application of the theories and techniques of inclusion mineralogy,isotope geology,geological statistics and lanthanide geochemistry, it is discussed that the Fankou deposit shares the properties of multistage geotectonic evolution, multifactor mineralization control, multisource oreforming materials, multicycle and multimode mineralization. The research suggestes that the homogenization temperature of the fluid conclusions vary with three peak values:120℃,150℃ and 200℃;the lead isotope age can roughly be divided into three groups: 340～390 Ma, 260～290 Ma and 140～190 Ma; the oreforming element lead has anatectic origin characteristics and parts of materials in the upper crust are likely to be interfused when anatectic lead moves up; the δ34S values of pyrite from orehost strata is 16.5‰ and that from ore is in the range of +13.6‰～+25.8‰, and sulfur is mainly derived from Devonian sea water. In addition, a few hypothermal minerals are found in the ore and alterations as light silicatization, chloritization, dolomitization and tinyvein shape pyritizationare are also found in wallrocks, which indicates that quite a few metallogenic materials originate from magma or mantle. Therefore, the Fankou Pb-Zn deposit is a typical polygenetic compound ore deposit.
出处
《桂林工学院学报》
2003年第2期149-153,共5页
Journal of Guilin University of Technology
关键词
铅锌矿床
地洼
多因复成
广东
Pb-Zn ore deposit
Diwa
polygenetic compound
Guangdong
