辽宁丹东五龙金矿矿化类型及其构造控制机理

位于辽宁丹东地区的五龙金矿受ＮＥ向剪切系统控制．在剪切带发展演化过程中，于不同阶段形成不同类型的金矿化。在早期韧性剪切带上升剥蚀阶段出现的ＮＥ向脆－韧性线状剪切带，控制同剪切带型金矿；叠加在韧性剪切带之上的ＮＮＥ向一级断裂控制破碎带蚀变岩型金矿的形成和分布；沿ＳＮ向和ＮＷ向的二级断裂构造控制含金石英脉型金矿。     

玲珑金矿田10号断裂及其成矿分析

10号是玲珑金矿田内发育的一条高角度断裂,构造岩破碎,结构松散.除其内部碎裂石英脉部分重新胶结外,其他构造岩均未胶结.经过构造特征分析,其形成于主成矿阶段,而后期又发生多次活动,近几年在该断裂中发现了具有工业价值的矿体,通过剖面与平面地质资料的对比分析、化学取样分析及玲珑金矿田成矿时期研究,10号断裂内发育的工业矿体属早期形成的石英脉矿体与后期断裂叠加的结果,早期形成的石英脉在构造动力作用下发生破碎并分散到断裂带中,加上金元素在地质历史时期内发生短距离运移,形成了目前的工业矿体.10号断裂多次活动对早期形成的矿脉起破坏作用并使金元素重新分配.     

云南元阳小河边石英脉型金多金属矿

金矿赋存于晚古生代第一期闪长岩体、小新街断裂两侧次一级断层破碎带含金石英脉中.原生矿石中以粒状自然金为主,粗粒—细粒.尚见叶片状、针尖状、不规则状金.含金石英脉有四个成生阶段,以第二、第三阶段含金性较好.矿床属中—高温闪长岩次级压扭性断裂中石英脉型金矿.     

我国最重要的岩金矿床类型

破碎带石英脉蚀变岩型金矿是我国最主要的岩金矿床类型。这类矿床具有相同的地质特征:矿床分布于太古一元古界变质岩中,矿带受区域构造控制,矿体受区域派生断裂制约,与燕山期岩体有关。     

压电法在内蒙乌拉山某石英脉型金矿的试验

内蒙乌拉山金矿是与蚀变花岗岩、石英脉有关的金矿床,在蚀变岩、破碎带和石英脉中含有少量黄铁矿等硫化物与金伴生,因此查明石英脉、蚀变岩和破碎带中金属硫化物的分布范围,对于寻找金矿很有意义。区内石英岩脉多沿破碎带分布,有时     

云南双江白水河金矿成矿地质特征

白水河金矿属断裂构造控制的热液蚀变型金矿床,金矿体产于新元古界澜沧群变质岩区多期断裂的次级分支断裂破碎带内。沿构造带有辉绿岩脉、石英斑岩脉、煌斑岩脉侵入,首次在临沧地区新元古界澜沧群变质岩区找到金矿。     

内蒙古白乃庙金矿断裂构造控矿研究

白乃庙金矿由石英脉型和蚀变岩型金矿组成，并受断裂及其破碎带控制，研究了白乃庙金矿断裂构造与成矿关系，断裂构造趋势面与找矿及矿体在断裂中的富集规律，并对成矿远景进行了预测。     

八卦庙金矿床石英脉的控矿作用初探

八卦庙金矿床的矿石品位与其石英脉发育程度和破碎程度、共生硫化物的含量成正比,与脉体的厚度、共生硫化物的粒度成反比;节理脉的含金量比顺层脉的含金量高;石英细脉的含金量高于脉旁围岩的含金量数倍至十多倍,但含金石英脉不能单独构成工业矿体.据此,作者首次提出金矿化类型属于细脉浸染型金矿,揉皱石英细(网)脉破碎带是此类金矿的一种重要而直观的找矿标志.     

内蒙古四子王旗夏尔楚鲁金矿床地质特征及成因

夏尔楚鲁金矿床位于白乃庙-温都尔庙古陆块晚古生代活动陆缘带内.金矿围岩为白音宝拉格组变质岩系和早三叠世黑云母花岗岩,矿体赋存在断裂构造破碎带中,受近南北向断裂构造控制.金矿体为含金石英脉,具有膨大、分支、复合特征.系统总结了矿石矿物组成、结构构造特征,认为金属矿化与硅化、绢英岩化、黄铁矿化、辉钼矿化等蚀变作用有关.成矿作用发生在伸展地球动力学环境下,控矿构造具有多阶段活动的特点,矿床的成因类型为岩浆期后热液型金矿床.     

内蒙古白音哈尔金矿矿床类型与金的赋存状态

白音哈尔金矿共发现金矿化(脉)体10余条,分别赋存于近南北向、北北东、近东西向三组构造破碎带中.矿化体规模不等,以4、2号脉(群)规模较大,初步认为白音哈尔金矿矿床成因类型为石英脉一蚀变岩金矿,金以自然金的形式赋存于多种矿物中.矿化体严格受断裂构造控制,产于华力西晚期石英闪长岩中,围岩有一定蚀变.     

八卦庙金矿床中含金石英脉的地球化学特征及意义

八卦庙金矿床是分布于秦岭造山带中的一种中高温碳酸盐型热液金矿床。石英是其主要的脉石矿物之一，与金矿化密切相关。根据含金石英脉的产状可将其分为三种类型：①顺层石英脉；②含铁白云石石英脉；③ＮＥ向节理石英脉。它们在微量元素和稀土元素的组成特征上有一定的差异，分别形成于金的不同成矿阶段，是金在成矿作用过程中演化的产物。同时，为八卦庙金矿的成矿提供了条件。石英中包裹体测温结果为八卦庙金矿床的中温成因提供了证据     

辽宁丹东五龙矿区石英脉型金矿床的黄铁矿标型特征研究

详细研究了辽宁丹东五龙矿区石英脉型金矿床中黄铁矿的产状、形态、成分、硫同位素及热电效应等特征,提取了五龙金矿黄铁矿中重要的成因和找矿信息。首次利用黄铁矿微量元素的三角形图解对矿区深部远景及其外围靶区内矿脉的矿化远景进行了预测,不仅为五龙金矿的成因研究提供了可信的矿物学依据,而且对五龙矿区深部及其外围靶区内矿脉的矿化远景进行了有效的评价,认为五龙金矿系中-浅成岩浆热液成因的金矿床,矿区深部及其外围的220号脉、38号脉、2号脉的金矿化远景较佳。     

Geology and Mineralogy of the Baolun Hydrothermal Gold Deposit in the Hainan Island, South China

Abstract. The Baolun quartz vein type Au deposit, is located at the southwestern Hainan Island. It occurs next to a Triassic ilmenite-series/S-type syenogranite complex. A ⁴⁰Ar/³⁹Ar plateau age for muscovite from the master orebody is dated to be 219.4±0.6 Ma, suggesting that the gold deposit genetically related to the granite pluton. In the Baolun mining area, orebodies of auriferous quartz vein and wall rock alteration occur in NNW-striking fracture zones hosted by weakly metamorphosed turbidite of the Lower Silurian age. Eight fracture zones, 400∼1300 m long and 10∼30 m wide, have been identified. The five fracture zones of them form orebodies. The ores are mainly of quartz vein type. More than 20 orebodies in shapes of vein and lens of 195∼751 m in length and 0.20∼7.49 m in thickness are known, and 14 of them occur in the No. 1 vein belt. Silicification, sericitization and pyritization are closely related to the Au mineralization. The ores exhibit commonly 1.54∼29.48 g/t in Au grade, partially >98 g/t. The master orebody is 720 m long and 2.62 m thick in average, with 9.53∼29.27 g/t Au. Gold reserves of more than 70 t have been proven by geological exploration. More than 20 metallic minerals including native gold and sulfides such as pyrite, pyrrhotite, chalcopyrite, and others are identified to be formed in four ore-forming stages: (1) Au-coarse grain quartz stage, (2) Au-fine grained quartz stage, (3) Au-bismuthide-bismuth sulfosalt-sulfide-quartz stage, and (4) calcite-sulfide-quartz stage. The Au mineralization in this deposit occurred mainly in the first three stages. A variety of Bi- and Te-bearing minerals is closely associated with native gold suggesting that the mineralization may take place in a relatively high temperature.     

栖霞市马家窑金矿床成矿流体地球化学特征

马家窑金矿床是胶东地区比较典型的石英脉型金矿床代表,属中低温热液矿床,成矿流体盐度较低,气相成分以H2O,CO2为主,其次是Na^＋,Ca^＋和Cl^-,K^＋和F^-较贫,流体的成分与大气降水热液相类似。成矿流体的H,O同位素值则反映大气降水在不同温度和不同水／岩值条件下与栖霞超单元回龙夼单元交换后的分布特征,认为马家窑金矿床的成矿热液属大气降水成因。     

The Ore-forming Fluid of the Gold Deposits of Muru Gold Belt in Eastern Shandong, China - a Case Study of Denggezhuang Gold Deposit

Abstract. Denggezhuang gold deposit is an epithermal gold‐quartz vein deposit in northern Muru gold belt, eastern Shandong, China. The deposit occurs in the NNE‐striking faults within the Mesozoic granite. The deposit consists of four major veins with a general NNE‐strike. Based on crosscutting relationships and mineral parageneses, the veins appear to have been formed during the same mineralization epochs, and are further divided into three stages: (1) massive barren quartz veins; (2) quartz‐sulfides veins; (3) late, pure quartz or calcite veinlets. Most gold mineralization is associated with the second stage. The early stage is characterized by quartz, and small amounts of ore minerals (pyrite), the second stage is characterized by large amounts of ore minerals. Fluid inclusions in vein quartz contain C‐H‐O fluids of variable compositions. Three main types of fluid inclusions are recognized at room temperature: type I, two‐phase, aqueous vapor and an aqueous liquid phase (L+V); type II, aqueous‐carbonic inclusions, a CC₂‐liquid with/without vapor and aqueous liquid (LCO₂+VCC₂+Laq.); type III, mono‐phase aqueous liquid (Laq.). Data from fluid inclusion distribution, microthermometry, and gas analysis indicate that fluids associated with Au mineralized quartz veins (stage 2) have moderate salinity ranging from 1.91 to 16.43 wt% NaCl equivalent (modeled salinity around 8–10 wt% NaCl equiv.). These veins formatted at temperatures from 80d? to 280d?C. Fluids associated with barren quartz veins (stage 3) have a low salinity of about 1.91 to 2.57 wt% NaCl equivalent and lower temperature. There is evidence of fluid immiscibility and boiling in ore‐forming stages. Stable isotope analyses of quartz indicate that the veins were deposited by waters with δ^O and δD values ranging from those of magmatic water to typical meteoric water. The gold metallogenesis of Muru gold belt has no relationship with the granite, and formed during the late stage of the crust thinning of North China.     

辽宁五龙金矿含金石英脉中石英标型特征及其找矿意义

辽宁五龙金矿含金石英脉中石英晶体的塑性变形显微裂隙和熔融现象普遍发育,在无矿石英脉中上述现象则不发育或缺失.气液包体在含金石英脉中数量多.成矿温度阶段性明显,沸腾现象也较发育.而在无矿石英脉中则反之.据包体化学成分推测成矿溶液化学成分属CO₂-H₂O-Cl-Na-Ca型,而无矿石英脉热液成分为CO₂-H₂O-F(Cl)-K-Ca(Mg)型,石英中微量元素浓集克拉克值(C_k)及相关系数表明Au、Sb、Bi、W、Ag为本区主要成矿元素.且含金石英脉的C_k值均大于无矿石英脉.热发光曲线在含金石英脉中主要为双峰和多峰型,而无矿石英脉则为单峰型,上述石英标型特征作为五龙金矿床石英脉中找金的重要标志.     

Mineralogical and Geochemical Characteristics of the Utanobori Gold Deposit in Northern Hokkaido,Japan

The Utanobori gold deposit is a low‐sulfidation, epithermal vein‐type deposit located in northern Hokkaido, Japan. The deposit is hosted by conglomerate, sandstone, and tuff of the Middle to Late Miocene Esashi Formation. These rocks were hydrothermally altered. Silica sinters and quartz‐adularia veins are common in the deposit. The quartz‐adularia veins either contain a ginguro band, which corresponds to the main gold‐bearing vein (Type 1 Veins), or do not contain a ginguro band but contain minor adularia (Type 2 Veins). Type 1 Veins are divided into three stages with 12–14 substages. Ore minerals identified include electrum, naumannite, chlorargyrite, bromargyrite, an unidentified Fe‐Sb mineral, and an Fe‐(Sb)‐As mineral. These ore minerals formed in the main mineralization stages I (bands I‐b and I‐d) and II (band II‐a). Scanning electron microscopy with cathodoluminescence images show that cathodoluminescence‐dark microcrystalline quartz exhibiting colloform (ghost‐sphere) texture is closely associated with ore minerals in the Type 1 Vein and Type 2 Vein, and the Al and K contents of such quartz are commonly >1000 ppm. This indicates that the ore minerals were crystallized from alkaline, silica‐saturated fluids at temperatures <200°C, which initially deposited amorphous silica that was recrystallized to microcrystalline quartz. The average Au content of electrum is 52.5 at% Au (n = 10), 65.7 at% Au (n = 20), and 55.5 at% Au (n = 5) in bands I‐b, I‐d, and II‐a, respectively, of Type 1 Veins. The δ³⁴S_CDT values of two fine‐grained disseminated pyrites in the altered conglomerate and bedded tuff in the argillic altered zone are ?4.3 and ?4.2‰. Ar‐Ar dating on adularia yielded 13.6 ± 0.06 Ma, 13.6 ± 0.07 Ma, and 13.6 ± 0.06 Ma for the stages I, II, and III of the Type 1 Vein, respectively. K‐Ar ages determined on adularia in the silica sinter and on whole‐rock of glassy rhyolite of the Esashi Formation are 15.0 ± 0.4 Ma and 14.6 ± 0.4 Ma, respectively. These radiometric ages indicate that silica sinter associated with the rhyolitic volcanic rocks formed prior to the main gold mineralization.     

吉林溜河金矿床石英的标型特征在找矿预测中的应用

应用石英的标型特征对吉林溜河金矿石英的含金性进行了初步的定量分析,结果表明该区不含金石英脉中石英晶胞参数明显比含金石英脉中石英晶胞参数小.含金石英脉中石英微量元素特征是：有一定铝碱含量,含较多铁,少量钡,而Co、Cr、Rb、Cs、Sc、Ta等平均含量低于矿区背景值,出现明显的亏损.含金石英包裹体的H₂O和CO₂含量明显比不含金石英包裹体的H₂O和CO₂含量偏高.根据上述石英的标型特征研究成果,再结合构造控矿规律、地球化学研究信息,对吉林溜河金矿区进行了矿区深部成矿预测.     

Gold Mineralization of the Gatsuurt Deposit in the North Khentei Gold Belt,Central Northern Mongolia

Mineral assemblages, chemical compositions of ore minerals, wall rock alteration and fluid inclusions of the Gatsuurt gold deposit in the North Khentei gold belt of Mongolia were investigated to characterize the gold mineralization, and to clarify the genetic processes of the ore minerals. The gold mineralization of the deposit occurs in separate Central and Main zones, and is characterized by three ore types: (i) low‐grade disseminated and stockwork ores; (ii) moderate‐grade quartz vein ores; and (iii) high‐grade silicified ores, with average Au contents of approximately 1, 3 and 5 g t^?1 Au, respectively. The Au‐rich quartz vein and silicified ore mineralization is surrounded by, or is included within, the disseminated and stockwork Au‐mineralization region. The main ore minerals are pyrite (pyrite‐I and pyrite‐II) and arsenopyrite (arsenopyrite‐I and arsenopyrite‐II). Moderate amounts of galena, tetrahedrite‐tennantite, sphalerite and chalcopyrite, and minor jamesonite, bournonite, boulangerite, geocronite, scheelite, geerite, native gold and zircon are associated. Abundances and grain sizes of the ore minerals are variable in ores with different host rocks. Small grains of native gold occur as fillings or at grain boundaries of pyrite, arsenopyrite, sphalerite, galena and tetrahedrite in the disseminated and stockwork ores and silicified ores, whereas visible native gold of variable size occurs in the quartz vein ores. The ore mineralization is associated with sericitic and siliceous alteration. The disseminated and stockwork mineralization is composed of four distinct stages characterized by crystallization of (i) pyrite‐I + arsenopyrite‐I, (ii) pyrite‐II + arsenopyrite‐II, (iii) galena + tetrahedrite + sphalerite + chalcopyrite + jamesonite + bournonite + scheelite, and iv) boulangerite + native gold, respectively. In the quartz vein ores, four crystallization stages are also recognized: (i) pyrite‐I, (ii) pyrite‐II + arsenopyrite + galena + Ag‐rich tetrahedrite‐tennantite + sphalerite + chalcopyrite + bournonite, (iii) geocronite + geerite + native gold, and (iv) native gold. Two mineralization stages in the silicified ores are characterized by (i) pyrite + arsenopyrite + tetrahedrite + chalcopyrite, and (ii) galena + sphalerite + native gold. Quartz in the disseminated and stockwork ores of the Main zone contains CO₂‐rich, halite‐bearing aqueous fluid inclusions with homogenization temperatures ranging from 194 to 327°C, whereas quartz in the disseminated and stockwork ores of the Central zone contains CO₂‐rich and aqueous fluid inclusions with homogenization temperatures ranging from 254 to 355°C. The textures of the ores, the mineral assemblages present, the mineralization sequences and the fluid inclusion data are consistent with orogenic classification for the Gatsuurt deposit.     

内蒙古蓬勃山地区金矿地质特征及找矿地球物理标志

蓬勃山地区位于内蒙古自治区额济纳旗北西部,处于北山成矿带东段。石炭系绿条山组与白山组为主要赋矿地层,金矿化类型为石英脉型,石英脉产出受断裂构造控制。工作组对蓬勃山地区1、2号测区展开激电中梯测量工作,发现数条规模较大的高阻异常带,暗示着其下隐伏石英脉,视电阻率在600~1 200Ω·m为识别隐伏石英脉的物探标志。多数高阻异常带并不具有明显的视极化率异常,因此其异常表现为无矿或弱矿化石英脉,但在1号测区的Ⅰ号高阻带出现较高的视极化率异常,具有高阻高极化异常特征,推测该隐伏石英脉可能含有较多的金属硫化物,具有较好的找矿前景。