乌拉山金矿剪切带岩石显微构造演化初探——以113号矿化脉为例

本文以乌拉山金矿113号含金石英脉为例,论述了含金剪切带岩石的显微构造特征。通过对含金石英脉近百个岩石薄片的系统分析鉴定,对组成含金石英脉的主要矿物(石英、长石)和典型显微构造进行对比,分析了含金石英脉显微构造的演化过程和变形机制。研究表明,113号含金石英脉是通过韧性变形,后期转化为脆性变形所形成的应变石英脉,是早期无金石英经变形改造和金矿化作用的结果,属含金剪切带的一种特殊情况,即再活动的产物。     

内蒙古含金石英脉的地质标志——以赛乌素金矿为例

含金石英脉具有特定的地质构造、结构构造、地球化学、矿物组合和围岩蚀变及氧化标志。这些特点区别于一般的石英脉。因此,认识含金石英脉的特点,对于石英脉型金矿床的勘查和寻找具有重要的实际意义。     

辽南隈子金矿床石英脉含金性的红外光谱评价及找矿前景分析

石英是石英脉型金矿床中金矿物的主要载体矿物，其含金量与其包裹体中水和二氧化碳的相对光密度Ｄ１，Ｄ２密切相关，利用红外光谱法研究矿区已知含金石金石英脉石英的标型特征，确定矿区石英脉含金性评价准则，不仅能帮助分析含金石英脉的成矿远景，而且可判别石英脉是否含金，从而减少金品位化学分析的工作量，提高找金效果，是金矿普查勘探中行之有效的找金手段之一。     

含金石英脉与不含金石英脉

石英脉型金矿床作为金产出的主要类型是人所共知的,找金矿的地质工作者们特别注意石英脉,一般的野外工作常常见到石英脉,但是,含金石英脉有什么特点?它与不含金石英脉有何不同? 从物理性状上看,含金石英脉常有铁染现象,外观上往往呈褐黄色或浅褐色。在脉的裂隙或与围岩接触的边缘褐色显得更深,有时呈褐红色。其次较常见的还有烟灰色,乳白色。含金石英脉往往多裂隙,有时在裂隙或节理上有细脉状或薄层状、浸染状的黄铁矿。有些含金石英脉,因风化石英呈多孔的不规则块状,有时被粘土质矿物包裹,不连续地出现在褐红色的粘土质风化、氧化带中。不含金石英脉大多数呈白色或无色透明,石英较纯净,无黄铁     

脉石矿物天然热发光在金矿靶区定量预测中的应用：以金厂沟梁金矿为例

根据１５０件工业矿脉和待评价石英脉中石英矿物天然热发光测试结果，查明了金厂沟梁金矿床典型工业矿脉脉石矿物石英天然热发光特征怀石英脉含金性之间的关系。以此为依据，建立了矿田石英矿物天然热发光成矿信息模型及石英脉含金量的定量预测模型，与其它方法相配合，取得了良好的找矿效果。     

内蒙赤峰莲花山金矿田石英脉的红外光谱成矿信息及定量预测

测试了１３０余件含金石英脉及不含金石英脉的红外光谱试样，查明了该区含金石英脉的红外光谱特征，同时配合其它预测含金石英脉的测量方法，提出了该区含金石英脉的预测靶区，经过初步验证，预测基本上是准确的。     

海南王下牙老金矿床矿石特征

王下牙老金矿为贫硫化物方解石-石英脉型金矿床,矿体严格受断裂裂隙控制.矿石的有用组分单一,有害杂质少,金矿物主要为自然金.主要的金属矿物为毒砂、黄铁矿,同时也是主要的载金矿物;非金属矿物为石英、碳酸盐矿物.矿石多具自形、半自形、他形粒状结构,以脉状、浸染状构造为主.自然金形态为角粒状、长角粒状,赋存状态以粒间金为主,其次为包裹金,裂隙金仅占8.2%,自然金为显微金.矿石类型以含金方解石-石英复合脉为主,其次为含金构造角砾岩型和含金蚀变岩型.     

内蒙赤峰莲花山金矿田石英脉的红外光谱成矿信息及定量预测

测试了１３０余件含金石英脉及不含金石英脉的红外光谱试样，查明了该区含金石英脉的红外光谱特征，同时配合其它预测含金石英脉的测量方法，提出了该区含金石英脉的预测靶区，经过初步验证，预测基本上是准确的。     

小秦岭金矿田地质特征及矿床成因

小秦岭金矿系产于太古界太华群中的含金石英脉型金矿。本文研究了小秦岭地层和岩浆岩中金的丰度,在建立太华群层序和该区重褶皱构造格局的基础上研究了含金石英脉展布规律、金矿脉的矿化特征与矿化阶段。根据含金石英脉切穿燕山早期岩脉等大量事实,认为金矿成矿时代为燕山晚期。通过对矿脉矿化特征、同位素地质特征、矿物标型特征、成矿物理化学条件及与晚燕山期二长花岗岩关系等研究,证明小秦岭金矿床属中低温中深岩浆热液矿床。     

中国石英脉型金矿床地质特征

石英脉型金矿床是指含金地质体为（含钾长石）石英脉的一类金矿床,是中国金矿床工业类型中的重要类型矿床.综合论述了石英脉型金矿床的含金地质体及矿体的空间展布特征、矿石矿物组合特征、矿石微量元素组合特征及围岩蚀变特征,形成地质环境及成因,总结了该类金矿床矿石中金的赋存状态、赋存特点及矿石的选冶条件和流程.     

新疆三个泉地区石英脉含金性评价研究

对新疆三个泉地区新近发现的几个金矿床（点）的含金石英脉及无矿地段的不含金石英脉的地质地球化学特征进行了研究,揭示了两者在流体包裹体特征、红外光谱特征等方面的显著差别,结合矿区含金石英脉的微量元素特征建立了该区石英脉含金性评价模型,指明了找矿方向。     

Genesis of the Bangbu Orogenic Gold Deposit,Tibet: Evidence from Fluid Inclusion,Stable Isotopes,and Ar-Ar Geochronology

The Bangbu gold deposit is a large orogenic gold deposit in Tibet formed during the AlpineHimalayan collision. Ore bodies(auriferous quartz veins) are controlled by the E-W-trending Qusong-Cuogu-Zhemulang brittle-ductile shear zone. Quartz veins at the deposit can be divided into three types: pre-metallogenic hook-like quartz veins, metallogenic auriferous quartz veins, and postmetallogenic N-S quartz veins. Four stages of mineralization in the auriferous quartz veins have been identified:(1) Stage S1 quartz+coarse-grained sulfides,(2) Stage S2 gold+fine-grained sulfides,(3) Stage S3 quartz+carbonates, and(4) Stage S4 quartz+ greigite. Fluid inclusions indicate the oreforming fluid was CO_2-N_2-CH_4 rich with homogenization temperatures of 170–261°C, salinities 4.34–7.45 wt% Na Cl equivalent. δ~(18)Ofluid(3.98‰–7.18‰) and low δDV-SMOW(-90‰ to-44‰) for auriferous quartz veins suggest ore-forming fluids were mainly metamorphic in origin, with some addition of organic matter. Quartz vein pyrite has δ~(34)SV-CDT values of 1.2‰–3.6‰(an average of 2.2‰), whereas pyrite from phyllite has δ~(34)SV-CDT 5.7‰–9.9‰(an average of 7.4‰). Quartz vein pyrites yield 206Pb/204 Pb ratios of 18.662–18.764, 207Pb/204 Pb 15.650–15.683, and ~(208)Pb/204 Pb 38.901–39.079. These isotopic data indicate Bangbu ore-forming materials were probably derived from the Langjiexue accretionary wedge. 40Ar/39 Ar ages for sericite from auriferous sulfide-quartz veins yield a plateau age of 49.52 ± 0.52 Ma, an isochron age of 50.3 ± 0.31 Ma, suggesting that auriferous veins were formed during the main collisional period of the Tibet-Himalayan orogen(~65–41 Ma).     

Fluid Geochemistry and Metallogenesis of the Hatu Gold Deposit in the Junggar Basin, Xinjiang

The Hatu large gold deposit is located on the western margin of the Junggar basin, Xinjiang. Its mineralization is characterized by auriferous quartz veins and Au-bearing altered fracturing zones. Studies on mineralogy, inclusions and decrepitation temperature indicate that the gold deposit was formed by overlapping of two kinds of fluid of different origins, instead of gradual evolution of a single fluid. The auriferous quartz veins are related to magmatism-originated fluid, but the Au-bearing altered fracturing zones to deep-derived fluid. Bonanzas in quartz veins were formed and localized at overlapping positions of two types of fluid under intensive compression.     

内蒙古达茂旗哈力齐矿区含金石英脉特征及金矿找矿标志

内蒙古达茂旗哈力齐地区金矿的主要类型是石英脉型,本区存在两种空间分布、形态、产状截然不同的石英脉。本文作者阐述了含金石英脉的特征,尤其是含金石英脉标型特征;同时得出结论:本区含金石英脉,分布于奥陶纪中酸性岩浆岩带附近,走向为近东西向,且地表表现为呈浅灰—灰白色、透明度低、网格状破裂、裂隙中有大量黄色、褐色次生矿物的石英脉可作为本区石英脉型金矿的找矿指示标志。     

小秦岭东闯金矿Au/Ag值特征及深部找矿预测

小秦岭地区不同矿化类型的含Au石英脉Au/Ag值有不同的特点，多金属硫化物型一般小于0.8，黄铁矿型介于0.8-2.0之间，少黄铁矿型一般大于2.0。利用Au/Ag值可以大致确定矿脉的矿化类型，判断矿脉的水平，垂向分带和剥蚀深度，预测深部矿脉的矿化类型，东闯金矿床深部Au/Ag值为1.39，预示其深部有可能出现黄铁矿型矿化，深部探矿仍有前景。     

裂变径迹法在金矿研究中的应用

用裂变径迹法对湖南平江、浏阳一带含金石英脉人工重砂中的石英进行了年龄测定，以石英的化学蚀刻技术进行了改进，选用６５％ＮａＯＨ蚀刻剂效果较好，石英裂变径迹年龄为１００－１６０Ｍａ，同时还分析了新疆某含金石英脉的铀含量及铀的显微分布。     

湘西金矿含矿石英脉厚度变化的分形和混沌分析

本文对湘西金矿主要矿脉的厚度变化进行了分形分析。各矿脉的厚度变化均具有分形结构特征,其中V1脉的分维值最小,V4脉的分维值最大;并且同一条矿脉在不同中段的分维值也有较大变化。通过对矿脉厚度变化的相空间重构,表明各矿脉厚度空间变化序列均为混沌演化序列,在相空间维数达到6～7时出现混沌吸引子,混沌吸引子的分维值为1.2～6.0。矿脉厚度变化的分维值越小,矿脉的平均厚度越大,其构造和流体活动也越强烈。构造变形、流体活动、矿物沉淀与岩石渗透率之间的非线性耦合作用以及矿脉通过连通而生长是导致矿脉厚度分形分布与混沌演化的主要动力学机理。     

GENERAL CHARACTER OF MULTISTAGES OF METALLOGENESIS FOR MICRO-MESOTHERMAL GOLD DEPOSITS:EXAMPLES FROM ZHANG-BALING TECTONIC BELT,ANHUI,CHINA

In Zhangbaling Tectonic Belt,two types of mineralization,auriferous quartz veins and alteration halos,can observed within many deposits.The pressure of metallogenesis of auriferous alteration halos is much higher than that of quartz vein,the temperatures of metallogeneses of these two types of orebodies are don't the same Geochemistry study indicates that both of them are micro-mesothermal deposits related to Yanshanian granites.The results of proton microprobe analysis of sulphides from the gold deposits in the area show that the "invisible" gold existed in sulphides is in the form of micro inclusions,and the concentration of "invisible" gold in sulphide minerals within quartz vein is poorer than that from alteration halos.Field observation shows that the structural modality of the fractures controlling the orebodies of auriferous quartz vein is different from that of the auriferous alteration zones.The fracture controlling the orebodies of auriferous alteration halos is compress-shear fracture,auriferous quartz vein is controlled by extensive fault.The alteration halos crosscut by auriferous quartz vein.The wallrocks of the former altered strongly and developed alteration zones well.The wallrocks of auriferous quartz vein altered slightly.The results of tectonogeochemical study shows that the concentration of associated metallogenesis elements and intensity of alteration are positively correlated with tectonic deformation strength for auriferous alteration halos.It indicates that it is probably a general character for micro-mesothermal gold deposits due to the multistages of metallogeneses took place.The tectonic environment is the most important fact determining the mechanism of fluid flow and precipitation of gold,and then the types of mineralization and modes of gold.     

陕川丁家林-太阳坪金矿带成矿机理

丁家林-太阳坪金矿带与丁家林-太阳坪脆-韧性剪切带同位分布、同能源作用、同步生成，是脆-韧性剪切变形形成的石英脉型金矿，总体走向NE，主要由丁家林和太阳坪2个金矿床组成，分石英单脉、单脉密集带、复脉带3个亚型。丁家林以含Au石英复脉为主，太阳坪以含Au石英单脉为主；成矿物质来源于富含Si质的志留系黄坪组，成矿流体主要是构造水；内生成矿作用分脆．韧性剪切变形-构造分异热液期和韧-脆性剪切变形-构造分异热液期，与2期脆-韧性剪切变形相对应，第2期为主成矿期。其成矿机理是脆-韧性剪切变形动力成岩成矿。     

云南墨江金矿床含金硅质岩的地球化学特征和成因

中石炭统金厂组（Ｃ２ｊ）下部含金硅质岩是云南墨江金矿庆的主要围岩之一,具有沉积结构构造,含热水沉积矿物。岩石的ＦｅＯ、Ｆｅ２Ｏ３、Ａｕ和Ａｇ含量高;Ｃｒ、Ｎｉ和Ｃｏ含量高、变化大;ＭｎＯ／ＴｉＯ２和ＴＦｅ／ＴｉＯ２比值较大;Ａｕ含量与ＮｉＣｒ含量相关性低,Ａｕ可能不是后期热液作用带入的。在判别硅质岩形成作用的一系列元素和微量元素关系图上,含金硅质岩位于热水沉积作用的范围内或接近于热水沉积作用。岩石