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大白岩测区位于个旧矿田卡房矿区东部。该区找矿预测目标为产于印支期变火山岩内及其附近围岩中的似层状铜矿体和锡铜多金属矿体。根据测区内隐伏矿体埋深大和基岩出露好的特点,制定了构造地球化学—遥感蚀变信息—大地电磁测深多元信息找矿策略。测区地表发育Cu、Sn、As、Pb、Zn、Sb元素构造地球化学异常,结合多元统计分析,厘定隐伏铜矿的构造地球化学找矿标志为Cu-As元素组合异常及因子得分Y(i,3)异常,隐伏锡铜多金属矿的构造地球化学找矿标志为Sn-As-Sb元素组合异常及因子得分Y(i,1)与Y(i,2)异常;在试验剖面测量和岩石物性参数测试基础上,按200 m×100 m网度完成高频大地电磁测深剖面12条,探测深度1000 m,根据推断的变火山岩空间位置及低阻异常中心的分布,在剖面上圈定了找矿有利部位。结合地质及遥感铁化蚀变异常信息,圈定找矿靶位3处。其中,a1靶区经钻探工程首先验证,平均品位达到0.593%,已达到工业要求。 相似文献
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滇中及其邻区的大地构造演化-运动经历了原陆壳活动阶段,原陆壳“稳定”阶段,地槽,地台和地洼5个阶段,留下了相应的构造层。前地槽构造层包括活动和稳定2种类型,具有面状分布的特征,代表陆壳演化初期刚性较低的地壳特点。地槽构造层以大红山群、昆明群和澄江组为代表,但邻区出现分异现象。 相似文献
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大尹格庄金矿床位于招平断裂带中段,金矿体主要赋存于招平断裂主裂面下盘的黄铁绢英岩化碎裂岩和黄铁绢英岩化花岗岩中。岩、矿石主成分分析显示:胶东群变质岩与煌斑岩成分均与玄武岩的相似,大尹格庄矿区煌斑岩与焦家矿区和玲珑矿区煌斑岩在化学成分上差异明显。绢英岩化蚀变过程中,显著带入Si和K,而Na、Ca和Mg等组分带出明显。稀土元素分析显示:黄铁绢英岩化蚀变和金成矿过程中显著带出稀土元素,胶东群变质岩的原岩与拉斑玄武岩有关,而煌斑岩及其他样品的初始物源又与胶东群变质岩有关。微量元素分析显示:Au、Ag、Cu、Pb、As、Mo、Bi、Rb和Sr等元素在金矿体及黄铁绢英岩化蚀变岩中呈聚集趋势,但Au元素的聚集与Cu、As、Pb、Zn、Hg和Ag等元素的聚集不同步。大尹格庄金矿的形成与燕山期构造运动和岩浆活动关系密切,并受到断裂构造系统、胶东群变质岩、玲珑花岗岩及伴生岩脉等条件的复合制约,长期大规模热液对流循环及所伴随的动态开放条件下的水岩反应和物质运动是大尹格庄金矿成矿的关键。 相似文献
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Through integrating the state of the art scientific knowledge in different research fields, some potential mechanisms of large-scale movements of underground pore-fluids such as H2O and CO2 in the continental lithosphere were presented and discussed. The results show that the generation and propagation of porosity waves are important mechanisms to transport mass and heat fluxes from the continental lithospheric mantle into the lower continental crust; the generation and propagation of porosity waves, pore-fluid flow focusing through lower and middle crustal faults, advection of pore-fluids through the lower and middle crust, and whole-crust convection in some particular cases are important mechanisms to transport mass and heat fluxes from the lower into the upper continental crust; heat and mass transport through convective pore-fluid flow is the most effective mechanism of ore body formation and mineralization in hydrothermal systems; due to heat and mass exchange at the interface between the earth surface, hydrosphere and atmosphere, it is very important to consider the hydro-geological effect of the deep earth pore-fluids such as H2O and CO2 on the global warming and climate change in future investigations. 相似文献
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1 INTRODUCTIONShortageoforereservesandlackofreplacingresourcebasementarethegreatpotentialtroublespreventingthedevelopmentofthemi 相似文献