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河南省洛宁县三官庙金矿床构造控矿特征 总被引：1，自引：0，他引：1
三官庙金矿位于太华群与熊耳群接触带附近的似斑状花岗岩体南侧,矿床明显受断裂构造控制。矿区内拆离断裂带和层间滑脱断裂蚀变带发育,含金蚀变破碎带中的构造岩石为含矿主岩。矿体形态以较稳定的似层状为主,金矿物为银金矿等;金的载体矿物为黄铁矿、石英和方铅矿。围岩蚀变为硅化、黄铁矿化、方铅矿化、绿泥石化和绢云母化等,矿化类型属蚀变岩型金矿。在多期次强烈构造-岩浆活动、区域变质和混合岩化作用过程中,Au元素得以沿层间滑脱断裂蚀变带富集成矿。 相似文献
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本文对毕力赫金矿床Ⅱ矿带围岩蚀变及其与金矿化关系进行了研究.矿床主要蚀变类型为硅化、钾化、黄铁矿化、绢云母化、电气石化、绿泥石化、高岭土化、碳酸盐化,其中硅化、绢云母化、黄铁矿化与金矿化关系密切;蚀变分带明显,由地表向下,依次为青磐岩化带→绢英岩化带→钾质蚀变带,绢英岩化带与金矿化关系最为密切. 相似文献
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治岭头金矿位于浙江省遂昌县,是我国东南沿海的一座大型金矿床。该矿床围岩蚀变发育,类型有硅化、绢云母化、绿泥石化、黄铁矿化、方解石化和菱锰矿化。从矿体到围岩可以划分为4个蚀变带:强硅化带、弱硅化-黄铁绢英岩化带、绢云母化带和绿泥石化带。沿矿体走向,蚀变强度整体上呈波动性变化,与矿体呈透镜状产出特征一致。硅化、黄铁矿化、菱锰矿化与金矿化关系最密切,而且这些蚀变具有相似的变化趋势。绢云母化和绿泥石化与硅化的变化趋势不同,且与矿化关系不密切。另外,矿区还发育方解石化,且强度较弱。金矿化及围岩蚀变均发育在古元古界八都群变质岩中,未进入上覆中生代火山岩盖层,证明治岭头金矿成矿作用与中生代火山活动无关。定量计算结果显示:蚀变过程中Al_2O_3、TiO_2、P_2O_5为惰性组分;SiO_2、CaO、MnO、Au、Ag、Cu、Pb、Zn等为明显带入组分;Fe_2O_3、FeO、MgO、K_2O、Na_2O、Ba、Sr等为明显带出组分。根据围岩蚀变和稳定同位素分析,推断治岭头金矿原始成矿热液流体应是富含Si、Ca、Mn、Au、Ag、Cu、Pb、Zn等组分的岩浆热液,后期有大气降水的加入。 相似文献
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甘肃李坝金矿围岩蚀变与金成矿关系 总被引：1，自引：0，他引：1
西秦岭地区是目前国内造山型和卡林型金矿找矿的热点地区之一,已发现的甘肃李坝造山型金矿为超大型规模。以李坝金矿6号矿带为例,系统地研究了其蚀变矿物组合、近矿围岩蚀变分带及相应的金矿化特征,总结了矿床(带)的蚀变分带模式。该模式具典型的中心式环带结构,可分为3个蚀变带,由中心向外依次为黄铁绢英岩化带、绢云母化带和绿泥石化带。蚀变矿物组合分别为黄铁矿+绢云母+石英±毒砂±白云母±电气石±方解石、绢云母+绿泥石+石英+黄铁矿±黑云母及绿泥石+黑云母±绢云母±黄铁矿;与这3个蚀变带相对应的是金的富集带、矿化带和无矿带。蚀变岩石物质组分迁移分析表明,围岩蚀变及其分带是热水流体/岩石反应时岩石化学组分发生迁移的结果,矿化伴随着蚀变发生,且金矿化与黄铁矿化和浸染状硅化关系最为密切。 相似文献
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当糜棱岩中金元素的含量足以满足工业利用,即在糜棱岩中可圈出独立的金矿体时,这种金矿床便可称为糜棱岩型金矿床.糜棱岩型金矿床是"中国金矿床工业类型"中的重要类型之一.此类金矿床多分布在古老地块周边长期活动的构造带之中.介绍了糜棱岩型金矿床的赋矿岩系、控矿构造、矿床、矿体、矿石以及含金矿物等地质特征.同时,对金成矿地质环境及矿床成因等作了探讨 相似文献
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金厂金矿18号矿体围岩蚀变发育顺序从早到晚为:钾化、硅化、绿泥石化、绢云母化、碳酸盐化、高蛉土化,从内往外依次发育青磐岩化带、绢英岩化带和钾化带.矿化出现在泥化和绢英岩化叠加处,以及泥化和青磐岩化叠加处.通过短波红外光谱测试技术,识别出本矿区有26种蚀交矿物,其中白云母含量与金矿体呈正相关,说明绢云母化与金矿化关系密切;青磐岩化带蚀变矿物组合为绿泥石+绿帘石+伊利石±埃洛石±蒙脱石±石英;钾化带蚀变矿物组合为钾长石+高岭石+埃洛石±蒙脱石±石英;绢英岩化带蚀变矿物组合为绢云母+埃洛石±蒙脱石±高岭石±石英. 相似文献
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The Qolqoleh gold deposit is located in the northwestern part of the Sanandai‐Sirjan Zone, northwest of Iran. Gold mineralization in the Qolqoleh deposit is almost entirely confined to a series of steeply dipping ductile–brittle shear zones generated during Late Cretaceous–Tertiary continental collision between the Afro‐Arabian and the Iranian microcontinent. The host rocks are Mesozoic volcano‐sedimentary sequences consisting of felsic to mafic metavolcanics, which are metamorphosed to greenschist facies, sericite and chlorite schists. The gold orebodies were found within strong ductile deformation to late brittle deformation. Ore‐controlling structure is NE–SW‐trending oblique thrust with vergence toward south ductile–brittle shear zone. The highly strained host rocks show a combination of mylonitic and cataclastic microstructures, including crystal–plastic deformation and grain size reduction by recrystalization of quartz and mica. The gold orebodies are composed of Au‐bearing highly deformed and altered mylonitic host rocks and cross‐cutting Au‐ and sulfide‐bearing quartz veins. Approximately half of the mineralization is in the form of dissemination in the mylonite and the remainder was clearly emplaced as a result of brittle deformation in quartz–sulfide microfractures, microveins and veins. Only low volumes of gold concentration was introduced during ductile deformation, whereas, during the evident brittle deformation phase, competence contrasts allowed fracturing to focus on the quartz–sericite domain boundaries of the mylonitic foliation, thus permitting the introduction of auriferous fluid to create disseminated and cross‐cutting Au‐quartz veins. According to mineral assemblages and alteration intensity, hydrothermal alteration could be divided into three zones: silicification and sulfidation zone (major ore body); sericite and carbonate alteration zone; and sericite–chlorite alteration zone that may be taken to imply wall‐rock interaction with near neutral fluids (pH 5–6). Silicified and sulfide alteration zone is observed in the inner parts of alteration zones. High gold grades belong to silicified highly deformed mylonitic and ultramylonitic domains and silicified sulfide‐bearing microveins. Based on paragenetic relationships, three main stages of mineralization are recognized in the Qolqoleh gold deposit. Stage I encompasses deposition of large volumes of milky quartz and pyrite. Stage II includes gray and buck quartz, pyrite and minor calcite, sphalerite, subordinate chalcopyrite and gold ores. Stage III consists of comb quartz and calcite, magnetite, sphalerite, chalcopyrite, arsenopyrite, pyrrhotite and gold ores. Studies on regional geology, ore geology and ore‐forming stages have proved that the Qolqoleh deposit was formed in the compression–extension stage during the Late Cretaceous–Tertiary continental collision in a ductile–brittle shear zone, and is characterized by orogenic gold deposits. 相似文献
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阿希金矿主要蚀变类型及其与金矿化关系 总被引：17，自引：2，他引：15
阿希金矿床赋存于下石炭统大哈拉军山组陆相火山岩中,成矿与破火山口(火山机构)环状断裂构造系统有关,属典型的冰长石-绢云母型大型金矿.阿希金矿近矿围岩蚀变为硅化、绢云母化、冰长石化、叶腊石化、绿泥石化等,以主矿体为中心向两侧共划分出6个蚀变矿物组合带,其中强硅化带和绢英岩化带与金矿化关系密切. 相似文献
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《Russian Geology and Geophysics》2007,48(11):901-912
Wall-rock metasomatites of the Kara gold deposit, a high-temperature medium-depth pneumatolytic-hydrothermal formation, have been studied. Gold mineralization is associated with the intrusion of granitoids of the Kara-Chacha massif (J3) and dikes of alkaline rocks (J3-K1), which include hybrid porphyries, “grorudites”, etc. They are characterized by telescoping of ores, expressed best of all on joints of ore-bearing sites.The origin of the Kara-Chacha massif (Amudzhikan-Sretensk complex) is connected with pre-ore areal propylitization. The propylites demonstrate a zonal pattern relative to the massif and ore veins. A composite metasomatic column of propylitized rocks has been compiled.The thickness of intensely altered wall rocks does not exceed 1.5–2.0 m and the structure of these zones is very heterogeneous. Syn-ore metasomatites are found in propylitized rocks. The major factor of syn-ore alteration of host rocks is the active behavior of alkaline elements. Albitization, silicification (in separate sites), tourmaline and pyrite alteration occur at the early quartz-pyrite-tourmaline stage of mineralization. Sodium is supplied at this stage. During the next quartz-actinolite-magnetite stage sodium and potassium are active. The host rocks demonstrate albitization, feldspar alteration, silicification, actinolitization, biotite alteration, and magnetite impregnation. Aegirine in veins is accompanied by occurrence of aegirine, alkaline amphibole, green biotite and, locally, quartz in host rocks. Potassium becomes more significant later, reaching the maximum activity at the quartz-sulfide stage. The development of quartz-arsenopyrite assemblage was accompanied by K-feldspatization, sericitization of host rocks, formation of green and tan biotites, and arsenopyrite impregnation. The formation of K-feldspar, sericitization, silicification, and sulfide impregnation are associated with quartz-sulfide ore. The final quartz-carbonate-polymetallic stage is accompanied by silicification and carbonate alteration of host rocks. Potassium becomes increasingly more active from outer zones of metasomatic columns to inner ones. The gold contents tend to increase with the potassium contribution in zones of hydrothermal alterations.The propylite alteration and syn-ore changes become more intense veinward. It can indicate that hydrothermal solutions with dissolved minerals penetrated through the most reworked zones. However, hydrothermal solutions during propylite alteration and later syn-ore changes of host rocks not always penetrated through the same zones of weakness, such as tectonic dislocations, contacts of various rocks, etc. The rocks, comprising inner zones of the metasomatic column of propylites are quite often observed at a certain distance from veins and accompanied inner zones of metasomatic columns of later syn-ore metasomatites. They sometimes are not associated with ore veins. However, they are demonstrate later superimposed threads and separate impregnations of syn-ore minerals.Abundant telescoping of mineralization and inheritance of mineralization stages complicate the structure of zones with syn-ore metasomatites. In the sites with telescoped mineralization the metasomatites contain minerals intrinsic to all stages of mineralization found at the deposit. 相似文献
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青海赛坝沟金矿地质特征及成矿时代 总被引：7，自引：1，他引：7
青海赛坝沟金矿是近年在柴达木盆地北缘地区发现的一个较为典型的金矿床。文章对该金矿床形成的地质背景、矿床基本地质特征和成矿时代进行了研究 ,并对矿床成因进行了较为深入的探讨。研究结果表明 ,矿床主要赋矿围岩为花岗闪长岩_英云闪长岩 ,形成时代为新元古代 ,代表着柴北缘造山带的基底 ;矿床严格受NW向韧_脆性剪切带控制 ,与金矿化有关的蚀变主要为硅化、黄铁绢英岩化和黄铁矿化 ;绢云母Ar_Ar法测得蚀变糜棱岩型金矿石的年龄为 (4 2 6± 2 )Ma,另见有含金石英脉切穿印支期花岗岩脉 [全岩K_Ar年龄为 (2 10± 3)Ma],矿化可分为两期。该矿床应为加里东期和晚华力西_印支期复合造山作用形成的造山型石英脉亚型金矿床 相似文献
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北干沟金矿床位于燕山金矿成矿带中段,属含金韧性剪切带石英脉型金矿床.新太古代变质岩含金丰度高,是金成矿的矿源层.韧性剪切带对金矿化具有控制作用.金矿化可分为2期,其与韧性剪切带脆性变形作用有关.自然金主要分布于黄铁矿、黄铜矿及其氧化物的微裂隙、粒间或空洞中.围岩蚀变强烈,主要类型有黄铁矿化、硅化、绢云母化、碳酸盐化、钠长石化、绿泥石化、重晶石化等.矿区今后的主要找矿方向是在I号断裂破碎带中寻找石英脉型、蚀变岩型金矿化和在Ⅱ号韧性剪切带东段的张性扩容段中寻找含金剪切带石英脉型金矿化. 相似文献
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山西堡子湾金矿床地质地球化学特征 总被引：3，自引：0，他引：3
山西堡子湾金矿床位于华北地台北缘，是以金为主伴生银铜多金属的中型金矿床。赋存地层为太古界集宁群。燕山期岩浆活动形成的石英二长岩及有关的隐爆角砾岩与成矿关系密切。围岩蚀变分布于角砾岩体内，主要为绢云母化、高岭石化、碳酸盐化和硅化。石英二长岩的稀土分布型式和岩石地球化学特征，说明其为重熔型岩浆侵入所形成。矿体中石英的氧同位素δ^18O值接近花岗岩类范围；矿床中硫化物的δ^34S值范围为-3．2‰～-1．2‰，接近陨石硫。堡子湾金矿的成矿物质来源于岩浆，成矿作用与燕山期岩浆期后热液活动以及隐爆作用和流体作用有关。 相似文献
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黑龙江省嫩江县永新金矿是近几年在嫩江—黑河构造混杂岩地区新发现的大型断裂带蚀变岩型金矿床,矿石矿物主要为碲金矿、碲金银矿、自然金,有少量的硫化物及氧化物。通过钾长石化带、绢云母化带及硅化带厚度与矿体厚度的线性关系分析得出,本区钾长石化带厚度、硅化带厚度与矿体厚度呈正相关关系,绢云母化带厚度与矿体厚度呈负相关关系。蚀变带厚度及矿体厚度水平面投影结果表明,矿区内热液蚀变在水平方向上具有明显的分带现象,自矿区东南到西北呈“阶梯状”分布,且绢云母化带厚度高值区、钾长石化带厚度高值区及硅化带厚度高值区在各阶梯中具有一定的对应关系。据以上分析,永新金矿成矿流体来自北西方向,矿体总体向北西延伸,暗示矿区西北深部具有较好的找矿前景。 相似文献
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在野外地质调查基础上,通过详细的岩相学和矿物学观察,以及矿床对比研究等手段,初步探讨了罗布真金银多金属矿床成因类型和地质意义。罗布真金银多金属矿床位于冈底斯陆缘火山-岩浆弧西段,矿体受NWW向断裂构造控制,呈似层状、脉状、透镜体状产于帕那组火山岩中,或产于火山岩与始新世闪长岩的接触部位。金银矿体由石英脉、蚀变岩和角砾岩组成。矿石具有角砾状、条带状和网脉状等热液型矿床典型构造。金属矿物主要有自然金、碲银矿、黄铁矿、方铅矿、毒砂和闪锌矿等,非金属矿物有石英、玉髓、绿泥石、方解石等。围岩蚀变属于中、低温环境下的一套蚀变矿物组合,有绢云母化、硅化、碳酸盐化、绿泥石化等;围岩蚀变具有从矿脉中心到围岩有绢英岩化到青磐岩化过渡分带,垂向上也有顶部伊利石、硅华、玉髓层,深部绿泥石、绢云母、微细粒石英-玉髓脉的分带。成矿流体显示出低温、低盐度的特点,主要来自于大气降水;而金、银等成矿物质主要来源于围岩。通过矿床对比研究,初步确定罗布真金银多金属矿床属于低硫化型浅成低温热液型矿床,该成因类型矿床在冈底斯成矿带西段尚属首次发现。 相似文献
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胶东西北部仓上金矿床上盘围岩蚀变和黄铁矿标型特征研究 总被引：1，自引：1，他引：0
上盘围岩是矿床钻探过程中首先遇到的围岩,研究其蚀变特征具有重要的找矿指导意义。对胶东西北部露天开采的仓上金矿床的详细研究表明,上盘围岩蚀变以绿泥石化为主,蚀变分带自远矿端到近矿端依次为方解石绿泥石化带、赤铁矿绿泥石化带、绿帘石化带和绢英岩化带。黄铁矿的形态、成分和热电性标型显示,成矿过程中上盘围岩提供了丰富的Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ、Ｐｂ、Ｚｎ和Ａｕ、Ｐｔ等。上盘围岩的近矿标志是绢英岩化增强,黄铁矿的｛１００｝＋｛２１０｝增多,Ｓ、Ｃｕ、Ｐｂ、Ｚｎ和Ａｕ、Ｐｔ增高,Ｓ／Ｆｅ离子比和ｗ（Ｃｏ＋Ｎｉ）／ｗ（Ａｓ＋Ｓｂ）降低,Ｐ型黄铁矿出现率增高,蚀变岩的金含量增高。 相似文献
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巴彦高勒银多金属矿是大兴安岭南段新发现的一例小型银多金属矿床，矿体多呈脉状、透镜状产于古元古界锡林郭勒杂岩中，受NE向断裂控制。矿石矿物主要有方铅矿、闪锌矿、黄铁矿、辉银矿、黝锑银矿等，脉石矿物主要有萤石、毒砂、石英、绿帘石、绿泥石等。围岩蚀变主要为褐铁矿化、硅化、高岭土化、黄铁矿化、绿泥石化、绿帘石化等。通过在该矿区开展1∶1万土壤地球化学测量，共圈定出编号为Ht-1至Ht-4的4个矿致组合异常区，并发现了对应的矿脉和蚀变带。根据矿体发育部位和围岩蚀变分带特征，推测成矿与热液活动有关，矿床成因为中低温热液型。通过分析成矿地质特征，得出该矿床浅表以褐铁矿化，深部以硅化、高岭土化为重要的找矿标志，北东向构造破碎带是重要的控矿构造，而1∶1万土壤地球化学测量成果圈出的Ag、Pb、Zn单元素地球化学异常及Ag-Sb-Sn-Cu-Pb-Zn组合异常是十分有效的化探标志。 相似文献