青海锡铁山矿区中间沟矿段矿床地质特征与找矿前景

【作者】 赵向东；

【导师】 李峰；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2008， 硕士

【摘要】 论文主要对锡铁山中间沟矿段矿床地质特征进行详细研究,进而通过地质、化探异常、物探异常进行深部找矿靶区预测与前景分析。对中间沟矿段含矿层位及其含矿建造组合作了详细研究,指出中间沟矿段的含矿层位为中部沉积岩组(03tc),其含矿建造中的热水沉积岩系尤为发育,按层位由下至上大致可以分为：隐爆角砾岩—硅质岩—黄铁矿条带硅质岩以及菱锰矿岩—纹层状、条带状硫化矿。从组合上看,缺少钾长石盐、电气石岩等典型的高温热水沉积岩组合,总体属于中低温热水沉积岩组合。并对中间沟矿段(碳质)片岩型铅锌矿体进行深入的研究,它是锡铁山沟矿段矿体所在层位和构造带的东南段,赋存于滩间山群沉积岩组(03tc)中上部,层位高于大理岩型矿体层位。根据中间沟矿段褶皱特征以及矿化结构剖面的研究,发现中间沟矿段具有倒转型喷流成矿的矿化剖面结构,由网脉状—层状富厚矿带组成,在结构构造上保留大量热水喷流沉积成矿标志,是典型的SEDEX型矿床。通过地质、化探异常、物探异常对中间沟矿段(7-035线)进行综合讨论分析,指出Ⅰ号靶区为找矿最优靶区,它位于原始沉积洼地中心区,利于大规模热水喷流活动与聚集,找矿潜力巨大；其次为Ⅱ号靶区,找矿标志较明显；Ⅲ号靶区是主矿体的延伸带,值得进一步开展找矿潜力评价。中间沟矿段Ⅰ号靶区的07、03、1线等部分见矿钻孔验证了找矿靶区的正确性,为矿区下一步深部找矿指明了方向。更多还原

【Abstract】 It mainly detailed researched on the geological characters of ore deposits in the middle ditch area of Xitieshan.And make the deep prospecting target forecast through geological, geochemistry and geophysical anomaly.The paper makes the detailed study on the ore-hosting horizon and ore-hosting construction.It detailed that the ore-hosting horizon mostly occurenced in the middle sedimentary rocks(O3tc) of the middle ditch area.And it hydrothermal sedimentary rocks grow especially well. According to the horizon from the bottom to the top, the paper points the types of hydrothermal sedimentary rocks in the mining area, can generally be divided into:breccia-siliceous rock-pyrite striation siliceous rock and dialogite rock-lamellar and striation sulphide ore. From the view of combination, it lacks of the typical combination of high temperature hydrothermal sediments such as k-feldspar rock, tourmaline rock and so on.As a whole, it belongs to the combination of low medium temperature hydrothermal sediments.And detailed researched on the carbonaceous schist type Pb-Zn ores of middle ditch area.It lie southeast of Xitieshan ditch area horizon and structural belt.And it occurenced in the middle sedimentary rocks(O3tc) of Tanjianshan group. Its horizon higher than the marble type ores.For study about drape character and mineral structure,we found that the inversion hydrothermal Vent-Flowing sedimentary structure in carbonaceous schist ores connect with the ore-bearing strata inversion in the middle ditch area. It composed by the rich and thick ore blet of network-layered. It’s structure construction retains a large number of mineralization mark of exhalative hydrothermal sedimentation. So is a typical SEDEX deposit.Through geological, geochemistry features, physical geography features for the middle ditch(7-0351ine) a Comprehensive analysis of the discussion.And point out the I target area was the best prospecting target areas. It stand the middle of the sedimentary billabong,and in favor of hydrothermal venting-flowing and gathering. So,there is of great potential for prospecting.Evidence prospecting criteria ofⅡtarger area.Ⅲtarget area was the stretch direction of the mainly ores.And it worth while to develop much of work. The 07,03 and 1 lines drilling prove the correcting of the target area in the middle ditch area.And it direction for the next prospecting.更多还原