辽宁五龙金矿成因矿物学研究与深部成矿预测
发布时间：2018-05-14 00:43
本文选题：黄铁矿 + 成因矿物学 ； 参考：《中国地质大学(北京)》2017年硕士论文
【摘要】：辽宁五龙金矿位于华北地台东缘,营口—宽甸古隆起的南部,鸭绿江成矿带西北侧。本文在前人研究的基础上,采用成因矿物学与找矿矿物学为理论指导对五龙金矿2号井控制的几条金矿脉之主成矿阶段黄铁矿进行了标型特征研究,并探讨了矿床成因及成矿热液来源,为深部成矿预测提供了科学依据。五龙金矿2号井黄铁矿的S/Fe为1.90~1.98,属于亏硫型;其ω(Fe)/ω(S+As)在0.888~0.908范围,因此认为五龙金矿区黄铁矿形成于中偏浅成矿深度。黄铁矿轻稀土微富集、重稀土显亏损,Ce具有不同程度的负异常,Eu则表现出较为显著的正或负异常;Co/Ni比值变化范围介于0.21~4.20之间,且随着深度的增加该比值有增大的趋势;其中前缘晕元素砷,近矿晕元素铅、银、锌,和尾晕元素钴、镍,具有相互叠加特征,表明该矿床的形成是多期次、多阶段相互作用成矿。不同标高矿体黄铁矿中微量元素组合(砷+锑+硒+锑)、(锌+铜+铅+银)、(钴+镍+钛+铬)垂向上总体显示旋回式震荡变化特点,同样佐证该成金沉淀为含矿热液多期次叠加所致。主成矿阶段黄铁矿热电性测试结果表明,以P导型为主,热电系数变化范围为㧟319.5~㧏333.9μV/℃,其直方分布图表现为双峰类型。空间上,P导型出现率在-454m—-609m标高范围内呈“S”型波动,在-609m标高以下P导型出现率在80%以上,并显示出很强的下延增大趋势,说明-454m—-609m标高范围的矿体仍然属于矿床的中上部。根据黄铁矿热电性参数计算,2号井矿脉在-454m—-609m标高范围的剥蚀率(γ)变化范围为29.5~64.5%,且呈现波动式变化,且在-609m标高以下有明显减小的趋势,同样暗示目前采矿空间内矿体属于矿床的中上部位,深部仍有找矿前景。依据热电性参数计算结果,2号井2-3号矿脉主成矿阶段黄铁矿形成温度为75.4—384.8℃,可以进一步分为两个温度区间,即高温区间300~360℃,峰值为330℃;中低温区间100~280℃,峰值为200℃。暗示经历两期成矿。矿石中微量元素银、铜、砷、铅、铋、钼异常显示具有一定的规律性和差异性,而且这些元素纵投影等值线趋势图显示高值区呈串珠状向南侧伏,可推测成矿流体通道向南倾伏。其中,银、铜、砷、铅、铋等值线异常区叠加,在南部-609m标高处见有两处高值区向下未闭合,暗示有向下延伸的趋势。鉴此推断南段矿体下部仍有找矿前景。
[Abstract]:The Wulong gold deposit is located in the south of Yingkou-Kuandian paleouplift in the eastern margin of the North China platform and in the northwest of the Yalu River metallogenic belt. Based on the previous studies, the typomorphic characteristics of pyrite in the main ore-forming stage of several gold veins controlled by well No. 2 in Wulong Gold Mine are studied by using genetic mineralogy and prospecting mineralogy as the theoretical guidance. The origin of ore deposit and the source of ore-forming hydrothermal solution are discussed, which provides scientific basis for deep metallogenic prediction. The S/Fe of pyrite in well No. 2 of Wulong Gold Mine is 1.90 ~ 1.98, which belongs to the type of sulfur deficiency, and its 蠅 _ (Fe _ () / 蠅 ~ (S) _ (S) is in the range of 0.8880.908, so it is considered that the pyrite in Wulong gold ore area was formed in the mid-shallow ore-forming depth. The light rare earth elements of pyrite are microenriched, and the negative anomalous EU shows significant positive or negative anomalies in different degrees, and the range of the ratio of Co / Ni is between 0.21 and 4.20, and the ratio increases with the increase of depth. Among them, lead halo element arsenic, near ore halo element lead, silver, zinc, and tail halo element cobalt and nickel have superimposed characteristics, which indicates that the ore deposit was formed by multi-stage and multi-stage interaction. The combination of trace elements (arsenic, antimony, selenium and antimony) (zinc, copper, lead, silver, cobalt, nickel, titanium and chromium) in pyrite of different elevation bodies shows the characteristics of cyclic oscillations. It is also proved that the gold deposit is caused by the multistage superposition of ore-bearing hydrothermal solution. The thermoelectric properties of pyrite in the main metallogenic stage showed that the main type of pyrite was P conductance, and the variation range of thermoelectric coefficient was 333.9 渭 V / 鈩，
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