胶东纱岭金矿床构造叠加晕特征及深部找矿预测

纱岭金矿床位于焦家断裂中南段,属于典型的焦家式金矿床,探获金资源量约389.2t,目前是国内平均勘查深度最大的金矿床。为进一步探讨纱岭金矿床深部成矿潜力,该文在野外地质工作的基础上,选取钻孔岩心样品,采用构造叠加晕研究方法,重点研究Ⅰ-2号主矿体地球化学特征、原生晕分带特征,建立构造叠加晕模型并进行深部找矿预测。研究结果表明:矿床的前缘晕指示元素为As-Sb-Hg,近矿晕指示元素为Au-Ag-Cu-Pb-Zn,尾晕指示元素为Bi-Mo-W-Sn;Ⅰ-2号主矿体构造叠加晕出现"反分带"现象,表明纱岭金矿床具有多期成矿成晕特征;在矿体尾部存在前缘晕与尾晕共存叠加现象,指示深部有良好的找矿前景,预测矿体侧伏方向深部(-1600m之下)有盲矿存在,预测靶位标高为-1600m～-2000m。     

胶东水旺庄超大型金矿床构造叠加晕特征及深部找矿预测

胶东是我国最重要的金成矿区,水旺庄金矿床是招平断裂带上近年来探获最大的深部特大型金矿床,首次采用构造叠加晕方法开展深部成矿预测意义重大。本文通过收集整理前人地质资料,结合野外地质调查工作,对水旺庄金矿床开展钻孔化探数据测试分析。研究表明：矿体中共同元素组合是：Au、As、Sb、Ag、Cu、Pb、Zn、Bi、W;特征元素组合是：As、Ag、Cu,其中Au为主要成矿元素,Cu为主要的伴生元素。以26勘探线为主要研究对象,运用构造叠加晕理论分析可知前缘晕特征指示元素为As、Sb、Hg;近矿晕特征指示元素为Au、Ag、Cu、Pb、Zn;尾晕特征指示元素为Bi、Mo、W。建立了水旺庄金矿床构造叠加晕理想模式,进行了深部矿体预测圈定预测靶区3个。     

山东招远夏甸金矿深部三维成矿可视化定位预测

招远夏甸金矿床位于华北板块之胶北隆起区内的招远-平度断裂带(简称招平断裂)中。招平断裂沿玲珑花岗岩体与前寒武纪结晶基底岩系的接触面展布,既是控矿构造,又是导矿和容矿构造,夏甸金矿床主要产于断裂下盘的碎裂状玲珑花岗岩中,在其上盘的基底岩系亦有分布,为一典型的破碎带蚀变岩型金矿床。该文以夏甸金矿田为研究对象,引入三维地质建模(3DGM)及三维可视化技术,研究探索隐伏矿体预测的三维化、定量化及可视化技术,重点突破了复杂地质体三维形态分析、控矿地质因素场模拟、成矿信息三维定量提取等关键技术,初步形成了隐伏矿体三维可视化预测的方法。依据勘探工程数据、矿体圈定规范并结合地质规律进行了矿体三维建模,结合已知的地震、重力、大地电磁等方法获得的各类数据作为研究深部地质构造的基本资料,对深部成矿构造进行了三维重构,对夏甸金矿深部进行了矿化空间分析和三维成矿信息提取,开展了三维定量成矿预测,在此基础上建立了三维定量成矿预测模型。在夏甸金矿田共圈定了Ⅰ号、Ⅱ号两个可视化立体找矿靶区,为今后深部工作优选区位提供了信息资料。     

宁夏卫宁北山地区金场子金矿区找矿模型及成矿预测

卫宁北山地区位于北祁连造山带东段,是宁夏境内金多金属矿床成矿条件最好、成矿迹象最多的地区之一,其中金场子金矿是该地区已知最大的金矿床。在归纳该区近年来找矿成果基础上,对金场子金矿床控矿因素、找矿标志和深部矿化规律进行了总结,构建了基于地-物-化多要素的综合找矿模型,并对矿区及外围、深部找矿靶区进行了圈定。研究表明：金场子金矿控矿因素主要为构造和地层,其中控矿构造表现为东西向断裂、北东向断裂及其次生裂隙为主,控矿地层表现为特定的地层层位及岩性组合。赤铁矿-褐铁矿化、硅化、绢云母化、黄铁矿化、黄钾铁矾化等围岩蚀变,Au-Ag-As-Sb化探组合异常以及中电阻率、中-高极化率地球物理异常为该区主要找矿标志。综合控矿因素和找矿标志,构建了矿区金矿综合找矿模型,并以此圈定地表找矿靶区6处,并进一步根据矿化深部变化规律圈定深部找矿靶区3处。通过对矿区及外围靶区开展地球化学剖面测量以及深部靶区钻探工作,验证了此次靶区圈定的合理性,为今后该地区找矿工作起到了很好的示范作用。     

Geological characteristics and metallogenic prognosis of main gold deposit in Altai gold ore belt, Xinjiang

Altai polymetallic mineralization belt is famous copper-polymetallic mineralization belt in the world. There are a lot of gold deposits in the Altai ore belt in Xinjiang, China. These gold deposits belong to two genetic types: volcanogene late-stage hydrothermal type and fractured altered rock type. The authors discuss mainly the geological and mineralized features of fractured altered rock type of gold deposits in Altai gold ore belt. Base on this study, the metallogenic law is summarized and the deep metallogenic prognosis has been done in Duolanasayi and Tuokuzibayi gold deposits, and some mineralized anomalys have been discovered.     

Geological characteristics and metallogenic prognosis of main gold deposit in Altai gold ore belt, Xinjiang

Altai polymetallic mineralization belt is famous copper-polymetallic mineralization belt in the world. There are a lot of gold deposits in the Altai ore belt in Xinjiang, China. These gold deposits belong to two genetic types: volcanogene late-stage hydrothermal type and fractured altered rock type. The authors discuss mainly the geological and mineralized features of fractured altered rock type of gold deposits in Altai gold ore belt. Base on this study, the metallogeniC law is summarized and the deep metallogenic prognosis has been done in Duolanasayi and Tuokuzibayi gold deposits, and some mineralized anomalys have been discovered.     

Geochemistry of fluid inclusions from Linglong gold deposit in Shandong，China

By means of microscopy and laser Raman spectroscopy,the authors studied the fluid inclusions in petrography.The results show that there exist three-phase CO2 -bearing and two-phase aqueous inclusions in gold ore;the fluid of NaCl-H2O--CO2 system went through immiscibility in ore-forming process.Ore-forming fluids were of low salinity(0.82%-5.40%NaCleqv),low density(0.54-0.93 g/cm3);mineralization tempera-ture were concentrated in 320℃--340℃,with ore-forming pressure in 62-126 MPa and mineralization depth in 6.34-9.35 km.The fluid inclusions in quartz are generally characterized by a small amount of CO2 and N2.Combined with recent results of the isotopic analysis for fluid inclusions and dating data,it was indicated that the main ore-forming fluids derived mainly from source of mantle-derived fluids with a small amount of magmatic fluid and meteoric water.The genetic type was mesothermal gold deposits involved by mantle-derived fluids.     

Geology and fluid inclusion characteristics of Qilishan gold deposit in Zhaoyuan of Shandong,China

The Qilishan gold deposit is located in the southern Zhaolai gold ore belt in the northwestern Jiaodong region.A total of seven gold ore bodies have been found in the mining area.Linglong gneissic biotite granite and the NE trending Lingbei fracture control the output and distribution of the gold deposit.The ore bodies with veined or irregular shape occur in the structural alteration zone.The ore bodies of different sizes are NE trending and SE dipping.The constituent minerals of the ores mainly include pyrite,chalcopyrite,native gold,electrum,argentite,matildite,hematite,quartz and calcite.The ores are characterized by metasomatic dissolution structure,as well as veined and brecciated structures.The ore-forming process is divided into four stages,namely quartz-,pyrite-,polymetallic-and carbonate stages.Study on fluid inclusion shows that the deposit is composed of gas-liquid two-phase inclusions （Ⅰ） and three-phase inclusions containing CO2 （Ⅱ）,and that the former dominates.The homogenization temperature is 259.6℃-373.7℃ ; the salinity of three-phase inclusions containing CO2is 5.77%-9.84% （NaCl） ; the salinity of gas-liquid two-phase inclusions is 6.58%-8.54% （NaCl） ; and the estimated ore-forming pressure is 55.2-82.2 MPa.According to the nonlinear relationship between the depth and pressure of the fluid in the fracture zone,the ore-forming depth of the Qilishan gold deposit is calculated as 5.95-7.14 km.It is preliminarily determined that the deposit is a mesophilic and hypothermal gold deposit.     

Geological and geochemical indicators and prediction of deep-seated ore bodies in Jiudian gold deposit of Pingdu,Shandong Province

Based on the geology and geochemistry of gold-bearing quartz veins in the Jiudian gold deposit of Pingdu,Shandong Province,the geological and geochemical indicators of occurrence of deep-seated ore bodies in the Jiudian gold deposit have been summarized.Extent occurrence of wide,intensive,varied alteration zones around the gold-bearing quartz veins and continual presence of diorite porphyrite and lamprophyry indicate the probable occurrence of deep-seated ore bodies at depth of gold lodes.As,Sb and Hg belong to the head halo elements, and their anomalies could reveal the probable occurrence of the deep-seated ore bodies below.     

Geological and geochemical prediction on deeply-seated ore-bodies in Haigou gold deposit of Jilin，China

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit,and the lode itself contains more than 30t of gold. Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors(element assemblages) .The high values of F1,F2 and F4 together indicate overlapped of multiple stages of gold mineralization,revealing high potential of gold mineralization at depth;the single high value of F4 represents the root of an existing ore body while high values of F3 and F4 show the intervals of barren sectors in the lode. Comprehensive geochemical studies show the high prospection potential below the 14th level and between lines 39-71. It is also prospective to look for blind ore-bodies between lines 15-29 and below the 10th level.     

Geological and geochemical prediction on deeply-seated ore-bodies in Haigou gold deposit of Jilin,China

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit,and the lode itself contains more than 30t of gold. Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors(element assemblages) .The high values of F1,F2 and F4 together indicate overlapped of multiple stages of gold mineralization,revealing high potential of gold mineralization at depth;the single high value of F4 represents the root of an existing ore body while high values...     

浙江青田石平川钼矿地质特征及成矿预测

通过收集近年第一手地质资料,总结了矿区地质特征和矿体特征,探讨了矿床成因及控矿因素。研究结果表明,石平川钼矿主要受石平川正长花岗岩控制,近矿围岩蚀变主要为硅化、绢英岩化和钾长石化。靶区预测经证实预测效果较好。     

Metallogenic origin of Sipingshan hot spring gold deposit in Hulin of Heilongjiang and its metallogenic mode

Sipingshan gold deposit is gold-bearing sillcalite in type. There only exist a few kinds of sulfide in the ore and it is lower in content. The gold degree is lower. Au is closely related to the Ag,Cu,Pb,As and Hg elements. The upper sillcalite has Eu and Ce negative anomaly,and the lower sillcalite has Eu positive anomaly. however,the hot spring cemented breccia and rhyolite porphyry have Eu negative anomaly;the S isotope component has deep-seated magmatic sulfur and terrestrial sulfate characteristic;and the Pb isotope has the character of the mixture origin of crust and mantle that is mainly dominated by Pb in the orogenic belt. The ore-forming fluid temperature is 180℃-244℃,characterized by magmatic hydrothermal and meteoric water;and the ore-forming age is 87 Ma. The deposit was formed by the metallogenic fluid in the tectonic fault zone overflowing near the earth’s surface and leading to the metallogenic function and the metallogenic substance deposition.