广西贵港六梅金矿原生晕及深部找矿

六梅金矿床位于广西贵港市龙山矿田福六岭金矿区,属于卡林型金矿床,矿体呈脉状分布。对矿山已开采中段系统采样,进行原生晕研究。矿床元素的空间分布规律显示六梅金矿床中Au、As为正相关关系,含量等值线在空间上吻合性良好,As可作为Au找矿的主要指示元素。原生晕轴向垂直分带序列自上而下为:Cu-Zn-Pb-Hg-Mo-W-Au-As-Ag-Bi-Sb,为"反分带"序列,显示出该金矿床具有多期次多阶段叠加成矿成晕的特点。根据矿床原生晕地球化学特征预测深部矿化的存在。     

基于构造叠加晕方法的内蒙古金厂沟梁金矿36号脉深部矿体预测

文章以构造叠加晕理论为指导,对金厂沟梁金矿36号脉已有的勘探工程进行系统采样,化验分析Au、Ag、Cu、Pb、Zn、As、Sb、Hg、F、B、Ba、Bi、Mo、Mn、Co、Ni、W等元素含量,总结矿床元素组合、含矿构造中原生晕空间分布特征和矿床构造叠加晕特征,建立构造叠加晕盲矿预测模式及标志,在36号脉深部圈定2个盲矿...     

欧巴拉格铜金矿床成矿地质、物化探模型研究

在总结欧巴拉格铜金矿床地质、地球物理和地球化学特征的基础上,进行了物探激电中梯和化探原生晕剖面的试验研究,认为物探ηｓ异常的基本形态和分布规律与矿区主要断裂带展布规律一致,在３．５％以上的异常范围内有铜金隐伏矿体的存在;化探Ｃｕ、Ａｕ、Ａｇ、Ｂｉ元素组合异常为隐伏铜金矿体晕显示。表明铜金矿床的形成受构造控制的次火山岩热液作用,从而建立了欧巴拉格铜金矿床成矿地质、物化探模型。     

油气化探中△C与烃类异常的相互配置关系

通过对△Ｃ（即后生碳酸盐）成因机理的分析，结合典型实例，对△Ｃ异常与烃类异常的相互配置关系及其与地下深处油气藏联系的研究，大量事实证明，△Ｃ异常并不总是与烃类异常一致的，只有当△Ｃ异常与烃类异常较一致时，△Ｃ异常才具有找油气藏的意义。     

Carbon and oxygen isotope zoning around Carlin-type gold deposits: a reconnaissance survey at Twin Creeks, Nevada

This study was undertaken to determine whether wallrocks around the Twin Creeks Carlin-type gold deposits exhibit oxygen isotope haloes similar to those found around other types of hydrothermal deposits. Mineralization at Twin Creeks is hosted by Ordovician Sequence shales containing some carbonate minerals and by Pennsylvanian–Permian Etchart Formation limestone. Analysis of orthophosphate-soluble carbonate from these rocks shows that oxygen isotope haloes are detectable in Ordovician Sequence shales but not in Etchart Formation limestone. The soluble fraction of Ordovician Sequence shales at Twin Creeks has δ¹⁸O values of 12 to 24‰ and δ¹³C values of 0 to −10‰. Most samples fall along a poorly defined trend that extends from δ¹⁸O of about 24‰ and δ¹³C values of about 0, which are typical of unaltered limestones, toward lower values for both isotope systems, which are typical of rocks that have undergone alteration by hydrothermal fluids. Plots of these values along two sections through the ore body show that δ¹⁸O values of wallrocks are lowest in the ore zone and increase outward, forming a halo several hundred meters in size. In the same plots, δ¹³C values of the wallrocks do not show systematic spatial variations. The soluble fraction of Etchart Formation limestones at Twin Creeks have δ¹⁸O values of 25 to 5‰ and δ¹³C values of 4 to −10‰, but do not show any systematic spatial variation relative to mineralization at the scale of our samples. Failure of the Etchart Formation samples to show detectable haloes is probably related to deposition of post-ore carbonate minerals or lower ore fluid : rock ratios. Material balance calculations used to model the isotopic composition of average Ordovician Sequence shales indicate that changes in temperature and water : rock ratio were probably not sufficient to account for the wide range of isotope compositions observed in these rocks. The most likely additional factor contributing to this range of values was a change in the composition of the altering fluid, probably by mixing of the ore fluid with surrounding meteoric water. These results suggest that Carlin-type gold deposits are surrounded by haloes of low δ¹⁸O values, but that detection of these haloes could be complicated by local compositional variations and post-ore modification of the wallrocks.     

内蒙古包头市柳坝沟金矿区地球化学特征及深部预测

[摘要]柳坝沟金矿区位于华北地台北缘西段,产于太古代乌拉山群变质岩系中,矿床主要矿石 类型为钾长石-石英脉,钾长石化是最发育的近矿围岩蚀变,与金矿成矿作用关系密切。利用对钻孔地 球化学元素的分析研究,313 号脉具有多期多阶段叠加成矿成晕的特点,根据不同成矿阶段元素组合和 单阶段形成原生晕的垂直分带规律及不同成矿阶段形成矿体(晕) 在空间上的叠加特点,建立了矿床的 原生晕叠加晕模式,对主要矿脉进行了深部预测,最后利用钻探工作验证,取得了较好的地质效果,为该 区深部探矿起到指导作用。     

油气化探多元信息提取及含油气性灰色识别

以新疆塔北雅克拉测区为例,利用地表化探组合指标和因子得分为特征信息,由已知油气圈闭的特征指标构成灰色子波模型,对研究区的相应特征标志（比较数列）按一定的网度进行灰色滑动关联滤波分析,从中提取与灰色子波相关联的综合关联度异常,然后依据异常所处的地质背景,特征和幅值进行预测的区的含油气性识别评价,使复杂多样的化探异常转化为与油气直接相关的顶部信息,提高了油气晕圈闭评价的精度和识别的准确度。     

溆浦县龙王江锑金矿带地质特征

矿带主要赋存于板溪群五强溪组上段之韧性剪切断裂带内,由近80条规模不等、含金性不一的锑金石英脉组成。金的富集与金属硫(砷)化物关系密切,毒砂是其主要载金矿物。褪色带内硅化、毒砂化是近矿围岩标志,砷是其标型元素。     

构造叠加晕找矿法在云南省杨梅田铜矿床深部盲矿预测中的应用

云南省龙陵县杨梅田铜矿为中温热液型铜矿床,铜矿体的分布宏观上受上奥陶统第2层底部层位的控制,主要产于构造破碎带中。在系统研究赋矿地层和矿床的元素组合、成矿成晕的轴向分带及叠加特征基础上,总结了深部盲矿预测的构造叠加晕标志;根据矿床成矿规律和探矿构造圈定有利成矿空间,结合构造叠加晕原理,在有利成矿空间上方坑道或钻孔中的前缘晕叠加部位圈定盲矿体预测靶区,并对定位预测的靶区进行工程验证。验证结果证明了构造叠加晕找盲矿法在热液型铜矿深部盲矿体定位预测的有效性。