新疆阿尔泰诺尔特地区金矿的成矿规律

阿尔泰诺尔特地区金矿主要赋存于石炭系,赋矿岩石主要是火山-沉积岩系,矿石有蚀变岩型和石英脉型两种:前者Au元素与凡、sb元素关系密切,含金矿物主要为毒砂;后者与Ag、Fe元素关系密切。金矿石的稀土元素特征、硫铅同位素与围岩一致,氢氧同位素组成显示成矿流体属于混合水,其中大气降水占很大比重。包痰体测温和成分分析表明,成矿流体属于低盐度,成矿温度为低温,结合冰长石的发现,本区金矿床属浅成低温热液矿床是明显的。同位萦年龄测定表明,金矿的主成矿期为燕山期。     

新疆阿尔泰金矿带主要金矿类型、成矿规律及成矿预测

新疆阿尔泰金矿带金矿分布广泛,主要类型有火山晚期热液型金矿床、与韧性剪切带有关的金矿床.对不同类型金矿床基本成矿特征进行了研究,探讨了不同类型金矿床的控矿作用,在此基础上总结了阿尔泰金矿带主要金矿类型的成矿规律,对主要金矿深部进行了成矿预测,发现并圈出了矿床深部的矿化异常.     

辽南碧流河中上游砂金矿地质特征及成矿地质条件

辽南碧流河中上游砂金矿位于营口—宽甸台拱与复州台陷的交接部位。砂金主要赋存于碧流河及其支谷水系第四系全新统砂砾石层的底部,砂金矿体平行河谷呈层状分布;矿体埋藏浅,砂金粒度中粗,易采选;属冲洪积型谷底砂金矿。本区砂金主要来源于岩金矿和含金地层,成矿物质丰沛,成矿地质条件优越,是辽南砂金成矿的远景区。     

新疆阿尔泰西南缘金矿成矿规律研究

阿尔泰西南缘是阿尔泰金重要成矿区之一。经对区内金矿床研究,本文将研究区内由sW向NE分为4个成矿亚带,重点阐述各成矿亚带金矿成矿地质特征、代表性金矿床的矿床地质特征及其控矿条件,总结其金矿成矿规律,指出区内金矿找矿前景。     

阿尔泰原生金矿成矿地球化学特征

据新疆阿尔泰新发现的多拉纳萨依、沙尔布拉克等7-9个成型金矿的成矿流体化学成分、盐度、密度、矿化度、还原参数、成矿温度、成矿压力、氧逸度、硫逸度、pH值、Eh值、硫同位素、碳氧同位素和氢氧同位素的系统研究认为．矿床成矿物质具多来源，但主要来源于围岩；成矿溶液水介质也具多来源，但主成矿阶段主要来源于大气降水；成矿环境以富碱质元素的中性一弱碱性强还原中低温低压环境为主；矿床具多期多阶段、多成因特点。     

望峰金矿带地质特征及成矿规律

望峰金矿带位于天山西段,属西南天山再生地槽,侵入岩均为华力西中晚期中酸性岩浆岩,金矿脉主要集中分布在博罗科努—阿其克库都克深大断裂以南２００～３０００ｍ范围内,产于志留系阿河布拉克组第一亚组片麻岩及石英片岩中,属高－中温变质热液矿床。     

水泉沟金矿田地质特征及成矿规律

应用地质、地球化学、数学地质综合方法,对水泉沟金矿田进行成岩成矿作用研究,探讨这个在我国首次发现的与偏碱性岩有关的金矿之成因机制,建立其成矿和找矿模型,从而对这种金矿新类型提供了较丰富的地质资料,也为该区进一步找矿提出了方向和标志。     

阿尔泰萨热阔布金矿床的自然铋及其与金矿化关系

萨热阔布金矿是阿尔泰山南缘金一多金属矿带中与断裂变质作用有关的石英脉一蚀变岩型金矿床。本文通过电子探针的研究,在该矿区发现较多的自然铋矿物,它与金矿化关系非常密切,产出于多金属硫化物阶段,与方铅矿、黄铜矿等共生。矿区蚀变岩和矿石的微量元素R型聚类分析表明,Bi与Au相关最密切,Au、Cu、Ag、Bi是主要的成矿元素组合。Bi异常可以作为金矿化的重要指示,自然铋矿物的出现可以作为含金石英脉富矿地段的重要标志。     

哈萨克斯坦阿尔泰巨型成矿带的地质特征和成矿模型

概要介绍了哈萨克斯坦阿尔泰巨型成矿带的构造背景、地质特征、成矿规律、典型矿床特征及成矿模型。矿山阿尔泰是世界上著名的海相火山岩型块状硫化物(VHMS)铜—铅—锌多金属矿富集区,已发现十几个大型和超大型矿床。VHMS型矿床形成于泥盆纪裂谷发育阶段,赋存于玄武岩—流纹岩双峰式火山岩和陆源碎屑沉积岩中。与成矿有关的火山岩主要为中泥盆世吉维特期(380~370Ma),部分为早泥盆世和晚泥盆世。泥盆纪之后的大陆边缘俯冲、碰撞、岩浆热液活动,对裂谷阶段形成的VHMS型矿床进行不同程度的叠加改造。在早二叠世形成了与花岗岩有关的钨、锡,铌、钽、锂等稀有金属矿化。     

Morphology and Chemistry of Placer Gold from Attappadi Valley, Southern India

We report the morphological, textural and chemical characteristics of gold grains in stream gravels from the Siruvani River in Attappadi Valley, southern India. The placer gold deposits contain both primary grains with jagged grain contours and secondary grains with smooth grain margins. The primary and secondary gold grains are also distinguished by marked contrast in microtextures with the latter displaying a range of corrosion textures including striations, etch pits and chemical corrosion cavities that coalesce to form honey-comb patterns. Some of these cavities are filled with fine clay derived from lateritic weathering front. While the primary grains are characterized by high silver content (up to 35.77 wt.%) with marginal overgrowths of high purity gold, the secondary grains show exceedingly high fineness (1000 Au/Au+Ag) levels (up to 984) with no marked compositional variation indicating selective extraction of Ag and/or reprecipitation of Au. From morphological and chemical characteristics, we propose that the high purity gold grains were not derived directly from primary sources, but underwent chemical refinement in the weathering front before they were transferred to the fluvial systems. Our findings have important implications for gold exploration in the Attappadi Valley.     

新疆额尔齐斯金成矿带的40Ar/39Ar年龄及其地质意义

额尔齐斯大型剪切构造带是目前阿尔泰古生代造山带内最重要的金成矿带。对其玛尔卡库里段的多拉那萨依和赛都两个剪切带型金矿床含金蚀变岩中的云母类矿物进行了 4 0 Ar/39Ar快中子活化法同位素测年 ,获得坪年龄分别为 2 92 .8± 1.0 Ma和 2 89.2± 3.1Ma,对应的等时线年龄分别为 2 93.1± 4 .8Ma和 2 91.9± 8.4 Ma,表明含金剪切带韧脆性剪切活动的时代或主成矿期为 2 90 Ma左右。结合区域地质资料说明控矿剪切带经历了由深部构造层次的韧性变形到浅部构造层次的韧脆性变形的演化过程 ,并伴随两次构造—岩浆热事件 ,而成矿作用主要发生于造山带构造演化的后碰撞伸展构造环境 ,与晚阶段的构造—岩浆作用有关     

Dating and Fluid Geochemistry of the Sarkobu Gold Deposit in Altay, Xinjiang, China

The dating of fluid inclusions of quartz yields an Ar-Ar isochrone age of 320.4±6 Ma. Three types of fluid inclusions have been identified with the homogenization temperature ranging from 157℃ to 362℃. The homogenization temperature consists of two groups. The first group varies from 157℃ to 166℃, and the second from 232℃ to 362℃. Their chemical composition is dominated by Na+-Ca2+-Mg2+ and Cl-. The relative concentration of ions is characteristic by Na+>Ca2+>K+>Mg2+ and C1->SO42-> F-. The δD and δ18O values indicate that the ore-forming fluid originates from mixing of multi-source water. The Sarkobu gold deposit has experienced two mineralization stages: gold was enriched during the volcanic-exhalative-sedimentary process in the early stage, while the gold deposit was finally formed under compression-shearing during the orogenic period.     

阿尔泰-准噶尔北缘铬铁矿- Cu- Au- Pb- Zn- Ni成矿带主要成矿地质特征及潜力分析

阿尔泰-准噶尔北缘铬铁矿-Cu-Ni-Au-Pb-Zn-Ni成矿带是全国重点部署找矿勘查工作的16个重点成矿区带之一,是全球阿尔泰巨型成矿带位于中国境内的一部分。文章根据全国矿产资源潜力评价成果,结合新的成矿理论和找矿进展,对该成矿带的边界进行了新的修定;从大地构造演化历史出发,分析总结了该带区域成矿地质背景和有利成矿地质条件,进一步修订了成矿带的成矿谱系;总结了成矿带内次级成矿单元的成矿特征;对带内矿床的主要成因类型和相应的典型矿床的成矿特征进行了总结;分析了成矿带的资源潜力,并在此基础上,确定了Cr、Mo、Cu、Au、Ni、Pb、Zn、Ag为本带下一步勘查部署的主攻矿种,划分了9个远景区,其中3个为重点远景区,6个为一般远景区。此项工作对本成矿区带内下一步矿产勘查工作部署有着重要指导意义和参考价值。     

新疆阿尔泰地区金矿床矿物组合,成分特征及其控制因素分析

阿尔泰地区目前已发现３０多处金矿床（点）,它们的矿物组合,矿物成分特征等无论在南北方向,还是东西方向均有显著差异。本文通过金矿床中矿物组合及其成分的研究,总结出产于不同区带内金矿床中矿物组合及矿物成分变化规律,最后指出地层、构造、岩浆作用,地壳成分及热液活动等对矿物组合及其成分的控制作用。     

Geochemistry, Geochronology and Genesis of Gold Mineralization in Nurt of Northern Altay, Xinjiang: A Case Study on the Aketishikan Gold Deposit

Gold deposits such as the Aketishikan, Togetobie, Tasbig-Kokeydlas, Kums and Hongshanzui gold deposits in the Nurt area in Altay of Xinjiang were found in Member 3 rhyolite tufflava, fragmental lava and ignimbrite of the Carboniferous Hongshanzui Group. Trace and rare earth elements, sulfur, lead, oxygen and hydrogen isotopes, and geochronological studies indicate that the ore-forming material was mostly supplied by the Carboniferous volcanic rocks through water-rock interaction under a low-to-moderate temperature, and the hydrothermal ore-forming fluid came from meteoric water with some magmatic water input evolved from the granitic magmas. Gold deposits in the Nurt area as well as in the northern Altay might form in multiple stages, and the Yanshanian mineralization period should be paid more attention besides the Variscan mineralization period.     

Geochemistry, Geochronology and Genesis of Gold Mineralization in Nurt of Northern Altay,Xinjiang： A Case Study of the Aketishikan Gold Deposit

Gold deposits such as the Aketishikan, Togetobie, Tasbig-Kokeydlas, Kums and Hongshanzui gold deposits in the Nurt area in Altay of Xinjiang were found in Member 3 rhyolite tufflava, fragmental lava and ignimbrite of the Carboniferous Hongshanzui Group. Trace and rare earth elements, sulfur, lead, oxygen and hydrogen isotopes, and geochronological studies indicate that the ore-forming material was mostly supplied by the Carboniferous volcanic rocks through water-rock interaction under a low-to-moderate temperature, and the hydrothermal ore-forming fluid came from meteoric water with some magmatic water input evolved from the granitic magmas. Gold deposits in the Nurt area as well as in the northern Altay might form in multiple stages, and the Yanshanian mineralization period should be paid more attention besides the Variscan mineralization period.     

山东唐家沟金矿床地质特征及深部预测

唐家沟金矿位于胶东牟平乳山金矿带西南段;历经数次勘查工作,近期获得较大突破,累计金金属资源量规模达到近大型。矿区内出露地层主要为古元古代荆山群变质岩及新生界第四系,构造以古元古代褶皱构造和中生代断裂构造为主,其中含金矿化蚀变带受 NNE 向、NE 向、近 EW 向断裂控制。主要控矿构造呈 NNE 向、近 EW向展布,矿石类型主要为黄铁矿化石英脉、黄铁矿化花岗质碎裂岩和黄铁矿化大理岩,矿化具多期活动特点。研究发现,控矿构造局部引张段与其他构造交会处是储矿的有利部位,矿化蚀变叠加地段预示着深部成矿可能性极大。深部预测 NNE 向金矿化断裂构造与 NE 向硫化物富集带交会部位,残留荆山群地层与侵入岩接触部位、接触带与NE 向硫化物富集带交会部位为成矿的有利地带。     

印尼中苏拉威西波龙谷金矿地质特征——一种斑岩型金-银、铅、锌多金属矿床

波龙谷金矿床产于新生代火山岩岛弧环境。金矿体主体赋存于石英闪长玢岩岩体和岩墙之内和内、外接触带,矿石构造以细脉状、细粒浸染状为主,蚀变带和矿化带受石英闪长玢岩岩体、岩墙形态和接触带控制。矿床形成与玢岩岩体、岩墙有密不可分的关系,属于斑岩型金-银、铅、锌多金属矿床。