辽宁排山楼金矿床黑云母花岗岩成岩时代及地质意义

排山楼金矿床是华北克拉通北缘东段赤峰—朝阳—阜新金矿成矿带中的韧性剪切带型金矿,矿体主要赋存于EW向韧性剪切带的太古宙变质岩中。选择控矿韧性剪切带北部的黑云母花岗岩为研究对象,对其进行了全岩主量、微量元素地球化学特征分析及LA-ICP-MS锆石U-Pb定年研究,探讨其成因类型、形成时代和构造背景。地球化学特征表明,岩石属于I型高钾钙碱性、准铝质—弱过铝质花岗岩,富集轻稀土元素及大离子亲石元素,呈弱的负Eu异常,亏损高场强元素,具有活动大陆边缘岩浆岩的地球化学亲缘性。锆石U-Pb定年结果显示,黑云母花岗岩侵入时代为早白垩世燕山期（(121.8±1.1)Ma）。通过野外观察黑云母花岗岩与控矿韧性剪切带之间的接触关系,对比岩矿间微量元素、同位素特征,结合华北克拉通区域构造演化,认为排山楼金矿床形成于岩石圈伸展的构造背景之下,成矿时代为早白垩世晚期,是韧性剪切作用导致矿源层成矿元素发生活化、迁移、富集的产物。     

山东招远谢家沟金矿围岩蚀变特征及与金矿化关系

谢家沟金矿是近年来在胶东半岛发现的一个大型韧性剪切带型金矿.矿床位于焦家-新城断裂和招远-平度断裂之间,区内围岩蚀变发育广泛,具有多期次,并与构造期次有着密切的联系.蚀变类型主要有硅化、绢英岩化、绿泥石化、钾化、黄铁矿化、碳酸盐化以及高岭土化,蚀变分带明显,蚀变强度与金矿化关系密切.近期研究表明,该金矿与早期的韧性剪切活动以及后期的脆性改造有成因联系,金矿化与围岩蚀变的主要期次同时形成.     

江西金山金矿控矿韧性剪切带的递进变形成矿机理：显微构造证据

在对江西金山金矿控矿韧性剪切带内岩石和矿石的显微构造分析基础上,对剪切带的递进变形与成矿机理进行探讨。研究发现,金山韧性剪切带在韧性—韧脆性递进剪切变形过程中发育3类石英脉透镜体或石香肠构造;剪切压溶和缝合线构造在金山韧性剪切带内强烈发育;扩散蠕变机制是金山韧性剪切带重要的变形机制。大量缝合线构造的形成增强了岩石的孔隙度和渗透率,有利于流体的迁移和沉淀。金山剪切带内变形和成矿作用经历了漫长复杂的地质过程,粗略估算至少跨过了72Ma。在递进剪切变形过程中经历多种构造变形机制,如经历了以透人性片理为代表的韧性剪切变形机制到以“次级剪切面”构造网络为代表的韧-脆性剪切变形机制的转换。剪切带的递进剪切变形自始至终控制着金的成矿作用过程,没有递进剪切变形也就没有金山金矿的形成。     

陕西勉略地区铧厂沟造山型金矿构造控矿特征

铧厂沟造山型金矿位于陕甘川金三角成矿区腹地勉县—略阳—宁强成矿带的西北侧。在矿区和外围构造以及显微构造综合研究的基础上,结合前人研究资料,探讨了该区构造对金矿的控制作用;结合区域构造演化,讨论了各期构造对成矿的影响及控制作用。结果表明:铧厂沟矿区及其附近在印支期至少存在两期构造运动,即俯冲-碰撞导致的SN向挤压(D₁)以及近EW向走滑剪切(D₂);SN向挤压(D₁)形成了近EW向的片理及层间紧闭褶皱,这些EW向构造形成了矿区的构造格架,其中褶皱的发育造成了载金黄铁矿在转折端的富集,属于容矿构造;近EW向走滑剪切(D₂)分为右行和左行剪切活动,造成了区内间隔分布的韧性剪切带,剪切带对其内部的黄铁矿进行了强烈改造,使其内部形成显微裂隙,成为Au沉淀富集的场所,从而控制了Au的进一步富集、沉淀,也属于容矿构造。这些认识表明铧厂沟金矿的形成与造山作用密切相关。     

铧厂沟金矿床北部控矿剪切带 地质特征及金的富集规律

野外调研和室内分析结果表明,区域韧性剪切带在铧厂沟金矿床非常发育,并经历了右行—左 行—右行多期(次)活动。北部控矿韧脆性剪切带是区域韧性剪切带演化的产物,以左行剪切为主,位于 铁夹树—庙湾北部厚层灰岩的下部。北部金矿带受北部控矿剪切带控制,长度大于1km,厚度约70 cm,从地表延伸至1120m标高,未见尖灭趋势。黄铁矿是该类矿石中最重要的金属矿物。自然金是主 要金矿物,有明金和显微金两种。矿石结构构造较为复杂,集中反映了热液矿床的构造特征。矿带的形 成可划分为热液期和表生期。原生矿石中绝大部分明金、显微金中的包体金和裂隙金都与黄铁矿密切 相关。黄铁矿(Ⅰ)经历了韧脆性变形,因而是金的最佳载体矿物。北部韧脆性剪切带的多期(次)活动, 使金富集成为工业矿体。结合地质特征,预测该矿带可延伸至1120m以下一定深度。     

新疆阿尔泰金矿床的类型划分及找矿评价标志

新疆阿尔泰的金矿资源类型有：岩金矿、伴生金矿和砂金矿．从金矿地质找矿的实用角度，以金矿床的主要地质特征、控矿地质条件及找矿标志为划分依据，将阿尔泰的金矿类型简化为浅成低温热液型、剪切带型及断裂变质带型，其中，浅成低温热液型可细分为火山岩型和微细粒浸染型，剪切带型可细分为破碎蚀变岩型和韧性剪切带型．每一种类型的金矿床具有相应的找矿评价标志．     

布尔根韧性剪切带金矿找矿前景

科克萨依剪切带糜棱岩型金矿床为布尔根剪切带之代表矿床,对该韧性剪切带的产出环境及其典型金矿床成矿特征的剖析,发现剪切带的所曹存的泥盆系火山碎屑岩及其浅变质岩地层为有利的富金－储金环境,该区尚处于工作程度较低状态,还存在一系列金矿找矿线索,远景可观,宜引起重视。     

韧性剪切带变形变质作用与金的矿化富集

韧性剪切带对金矿的控制作用已引起人们广泛的关注,特别是韧性剪切带内岩石的变形变质作用在含金流体的运移,金的沉淀富集中所起的作用,本文简要回顾了韧性剪切带对金矿田（床）,金矿体的控制作用,金在韧性剪切带内的沉淀富集机理,在总结前人韧性剪切成岩成矿的模拟实验研究的基础上,从变形变质作用入手,探讨了韧性剪切带内的构造物理化学过程及其与金矿化富集的关系,认为,流体作用下韧性剪切带内的变形变质作用控制着金的沉淀富集。     

东天山印支期矿床地质特征、成因类型及成矿规律

东天山成矿带是我国重要成矿带之一,以古生代大规模成矿为特色。近年来,东天山成矿带陆续报道了一批印支期的成矿年龄,吸引了越来越多的关注。基于此,初步总结了东天山印支期矿床的地质特征、成因类型及成矿规律。结果表明:东天山印支期矿床的成矿元素丰富,金、钼、钨、铼、铷等均达到大型—超大型规模,还蕴含了锂、铍、铌、钽、钒、钛、铁等金属矿床,显示出东天山印支期成矿的重要性。印支期矿床的成因类型多样,既发育了岩浆型钒钛磁铁矿床、花岗岩型铷矿床、伟晶岩型锂铍铌钽矿床等岩浆矿床,又发育斑岩型钼铼矿床、矽卡岩型钨钼铷矿床、石英脉型钨矿床、造山型和浅成低温热液型金矿床等热液矿床。在空间分布上,印支期矿床集中分布于康古尔韧性剪切带和中天山地块及其东南缘,而其他构造单元成矿信息较少。虽然印支期矿床的分布具有时空相似性,但关键控矿要素明显不同,矽卡岩型钨矿床明显受中天山前寒武纪基底控制,钒钛磁铁矿床、花岗岩型铷矿床、伟晶岩型锂铍铌钽矿床和斑岩型钼矿床受不同性质的侵入岩控制,而造山型金矿床明显受韧性剪切带和断裂构造控制。因此,东天山印支期造山作用的资源潜力已初步显现,未来应加强东天山甚至新疆地区的印支期成矿作用研究和找矿勘查工作。     

山东海阳土堆金矿床成矿控制条件及成矿类型研究

概述了山东海阳土堆金矿床的成矿地质背景及矿床地质特征。研究了地层、断裂、裂隙构造等方面的矿控条件,通过分析矿控条件认为:荆山群分布区是寻找该类型金矿的地层标志;NE向的断裂带中,绢英岩化、绿泥石化、钾化、硅化、黄铁矿化等蚀变特征是寻找金矿(化)体的围岩蚀变标志,新元古代岩体及燕山晚期脉岩发育是寻找该类金矿的岩浆岩标志。     

Study on Shaxi porphyry copper-gold deposit in Anhui:gold mineralization and occurrence determination by PIXE

1　INTRODUCTIONParticleinducedX rayemission(PIXE)isanide almethodtoinvestigatethegoldoccurrenceindiffer enttypesoforedeposits[1 4 ] .Usingthedynamicanal ysismatrixtransformalgorithm ,PIXEdatacanbeusedtogeneratequantitativelytrueimagesoftraceel ementspatialdistributioninminerals .Themoderntechniqueisproventobeveryusefultostudytheoremineralsandcanevenbeusedtodetectvaporphaseinfluidinclusionsintheoredepositresearch .Forexam ple ,inthecaseofcoexistingbrineandvaporinclu sionsfromIndonesian…     

沂沭断裂带中段金矿构造控矿规律研究

通过对沂沭断裂带中段地层产状、岩性、构造节理的野外勘察,室内镜下观察鉴定和样品测试分析,运用最新的大地构造理论对该区成矿背景综合研究,总结该区金矿构造控矿规律。本区金矿的生成具有韧性剪切带的双阶段控金性。其基底韧性剪切带与断裂带属于继承关系。韧性剪切带中并不赋存金矿,而是作为控矿构造,控制矿床的产出状态,而次级构造控制矿床的分布和延伸。矿床主要分布于应力集中构造活动强烈的区域。韧性剪切带控制金矿的规律在于垂向上控制金矿的梯度性。沂沭断裂派生的控矿构造形迹在区域上由西而东表现为韧性-脆韧性-脆性的演化规律（旋回）和倒N字型断裂组合形态,在其伴生的次级断裂带之间也存在有次级旋回,并构成低级序构造组合图像。     

One potential superlarge Pb-Zn ore occurrence with Himalayan thermal brine genesis ——Wuqia Region, Xinjiang, China

The paper focuses on geological and geochemical evidence of thermal brine genesis of Pb-Zn deposits in Wuqia district, Xinjiang. The results suggest that the known Pb-Zn deposits, such as Wulagen, are thermal brine genesis, which is supported by the features of tectonic setting, magma and regional metamorphism, and the characteristics of trace element distribution in strata and redistribution in the ore-forming process, the REE patterns and their main parameters of main type ores, the composition features and the source indicators of Pb, S isotopes. Ore-forming conditions of superlarge Pb-Zn deposits studies show that there exists tectonic and sources setting of Jinding-type superlarge Pb-Zn deposits in this area. Five Pb-Zn ore belts and central uplift belts discovered lately have not only confirmed that the genesis of Wulagen Pb-Zn deposits is thermal genesis, but also further proved that there exists tectonic and source setting of Jinding-type superlarge Pb-Zn deposit in the study area. Mineral deposit model was described and prospecting potentiality of superlarge Pb-Zn deposit and their significance were discussed.     

Coupling mechanism of mineralization and hydrocarbon-forming in hydrothermal convection system: An example from Longtoushan Sn-polymetal deposit, Dachang

Longtoushan Sn-polymetal deposit is a large-scale deposit of high-tenor. The ore-bodies occur in reef limestone of middle Devonian. There is much anthraxolite in reef limestone and ore-bodies. The anthraxolite is the postmature result of oil-gas’ thermal metamorphism. The close relationship of anthraxolite and Sn-polymetal deposit reveals the space-time relation between oil-gas evolution and Sn-polymetal mineralization. Sulfur isotope of Longtoushan deposit is close to oil’s sulfur in Devonian, which indicates obvious relationship between the sulfur’s source of deposit and oil-gas’ activity. The forming of Longtoushan deposit relates to exhalative-sedimentary mineralization in Devonian. Because of the favorable hydrocarbon-forming condition of Longtoushan reef and surrounding basin facies’ black shale and peat, coupling of ore-formation and hydrocarbon-forming occurs in seabed’s hydrothermal convection. The distributing of ore-forming elements indicates the presence of hydrothermal convection system. The thermal fluid containing organic matters conduces to Sn-polymetal elements’ activation and transfer, and provides catalyzing condition to the transforming from SO ₄ ²⁻ to S²⁻. The erosion action of brine containing organic acid to reef limestone induces the growing of crannies and karst’s caverns, which provides advantageous space to Sn-polymetal mineralization. The heat source of mineralization provides thermocatalysis condition to hydrocarbon-forming. When the circulatory fluid containing oil-gas enters the high-temperature region(>150°C), the oil-gas is decomposed and anthraxolite comes into being. Foundation item: Project(20030533012) supported by Specialized Research Fund for the Doctoral Program of Higher Education     

Thermodynamic assessment of Au-Zr system

1　INTRODUCTIONChemicalvapordeposition (CVD)diamondholdsgreatpromiseinsolvingthermalmanagementprobleminhigh performancemulti chipmodules (MCMs) .However ,thismaterialdoespresentsometechnologi calchallenges ,onebeingthedevelopmentofreliablemetallizationsystems[1] .Thedesirablecharacteristicsofametallizationsystemare goodadhesiontothesubstrate ,lowstress ,goodelectricalconductivityandminimalreactionsatsubsequentprocessingtempera tures (upto 4 0 0℃ ) [2 ] .Goldisusuallychosenasthemetalfor…     

河南卢氏桃花金矿床地质特征及控矿因素

桃花金矿床位于苍房－胡家院加里东期石英脉型金成矿带上，区域性的瓦穴子－鸭河口断裂从矿区中部通过，是复经加里东－燕山期的历次地质事件形成的由北向南逆冲推覆构造，含金石英脉分布在该断裂以北，数量多，密度大，其走向近南北，受次级南北向断裂控制，石英脉中金的富集与黄铁矿含量成正相关关系，与烟灰色硅化及碳酸盐化关系密切，蚀变带宽，蚀变强烈时金品位较高，宽坪群地层为金的主要矿源层之一，区域性的瓦穴子－鸭河口断裂与矿区北部－韧性剪切带的叠加部位是成矿的有利地带，岩浆活动除为金矿化提供了热源和有利的物化环境之外，其本身也为成矿提供了部分物质来源。     

THE GENETIC CHARACTERISTICS OF THE CUPREOUS PORPHYRIES IN SHANYANG DISTRICT,

ＴＨＥＧＥＮＥＴＩＣＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＣＵＰＲＥＯＵＳＰＯＲＰＨＹＲＩＥＳＩＮＳＨＡＮＹＡＮＧＤＩＳＴＲＩＣＴ，ＳＨＡＮＸＩＰＲＯＶＩＮＣＥＺｈａｎｇＹａｘｉｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＣｅｎｔｒａｌＳｏｕｔ...     

Isotope systematics and metallogenetic age of Zhuanghe gold deposit, Liaoning province, China

Based on the metallogenetic geology conditions, the H, O, C and S isotopic compositions were measured by MAT-251 mass spectrometer, and Pb isotope and Rb-Sr dating were carried with MAT-261 multi-acceptor mass spectrometer. The results show that the δ18O values of gold-bearing vein quartz from different levels are 1.19%-1.42%. The calculated δ18O values of ore fluids are 0.55%-0.78%, and δD values are from –8.64% to –6.66%. The calculated values of δ 34 SH2Sby the δ34Spy values in quartz veins display sulfur isotope compositions from -0.053% to 0.413%. Carbon isotope compositions of carbonates are from -0.612% to 0.140%. The mole ratios of 206Pb to 204Pb, 207Pb to 204Pb and 208Pb to 204Pb in auriferous quartz vein are 16.987-17.545, 15.342-15.623, and 38.254-38.744, respectively. The age of the Zhuanghe gold deposit determined by Rb-Sr isochron of the fluid inclusions in quartzes is (143.0±5.8) Ma. These isotopic data suggest that the metallogenetic fluids are generated from magmatic hydrotherm and the origin of ore-forming matters is related to the deep-derived magmatic activities. Meanwhile, the metallogenetic epoch of the Zhuanghe gold deposit is in Yanshanian period.     

青岗坪金矿床地质特征及成因探讨

青岗坪金矿位于华北地块南缘熊耳山变质核杂岩中部,其矿化类型为构造蚀变岩型。熊耳山变质核杂岩之拆离断层和次级断裂是该区的主要控矿构造,矿体主要赋存在层间破碎带中部的强硅化蚀变岩和蚀变糜棱岩中,金品位平均为7.04×10-6;成矿流体的1δ8OH2O为2.7‰-6.6‰,δDH2O为-63.1‰--96.3‰,成矿流体主要来源于岩浆水;石英包体测温结果为347.5-370℃,矿床成因类型属于中高温热液金矿床。     

Source and location mechanism for lode gold deposits hosted in metamorphic rocks in northeastern Hunan, China

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