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通过某金矿床黄铁矿晶体形态和热电系数等标型的研究，指出不同阶段、不同矿化类型和不同标高晶形和热电系数、导型的演化趋势及其与金矿化的关系，发现了矿体从＋２０ｍ标高→－７０ｍ标高，矿体经历了一个“再现→尖灭”的过程，并从晶形的角度定量地模拟出标高与单形晶｛１００｝＋｛ｈｋ０｝含量和的关系方程，从而算出了矿体尖灭再现的纵向距离为９３ｍ，借助于计算机有效地找到了矿物学填图参数——黄铁矿热电系数均方差，进行了矿物学填图，对矿体进行深部定位预测。 相似文献
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文中钾长石脉型金矿，主矿体受近南北向张扭性断裂控制，形态为追踪式脉状，矿石工业类型为单一金矿石。主要脉石矿物为肉红色钾长石，载金矿物为五角十二面体黄铁矿及褐铁矿等。金为自然金，呈包体金、裂隙金和粒间金产出。直接找矿标志为含五角十二面体黄铁矿铁方解石钾长石脉。 相似文献
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茅排金矿位于云开—武夷变质混合岩带的西北部,赋存于震旦系周谭群中低级变质岩系中,以硅线石二云母片岩、变粒岩为主,夹少量片麻岩和混合岩,并被认为是金成矿的主要矿源层。金矿化受控于北东向展布的递进变质型韧性剪切带;矿体呈北东向展布,主要呈含金石英脉产出。矿床具多期多阶段多源复成因的成矿特点,初步划分早、晚两个成矿期。成矿早期受加里东中晚期混合岩化作用和韧性剪切带控制;成矿晚期为一叠加富集成矿作用过程,受燕山期构造-岩浆活动及中基性岩脉控制。目前发现金以单一的自然金形式产出,矿石建造属少硫化物-石英-自然金型。矿物共生组合简单,主要有黄铁矿、磁黄铁矿、黄铜矿、方铅矿和自然金等。 相似文献
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哈图金矿蚀变岩型矿体特征及金赋存状态研究 总被引：1，自引：0，他引：1
哈图金矿由石英脉型和蚀变岩型矿体组成,蚀变岩型矿体遭受了强烈黄铁矿化、毒砂化、碳酸盐化、硅化和绢云母化蚀变.成矿作用划分5个阶段:钠长石-石英阶段(I)、黄铁矿-碳酸盐-石英阶段(II)、黝铜矿-黄铜矿-自然金阶段(III)、毒砂-碳酸盐-绢云母阶段(IV)和方解石-石英阶段(V).其中,II—IV阶段是主要金成矿阶段.哈图金矿含金矿物主要为自然金,平均成色912.自然金呈裂隙金、包裹金、粒间金形式嵌布在黄铁矿和毒砂中.当载金矿物为黄铁矿时,自然金与黝铜矿-黄铜矿-闪锌矿关系密切;当载金矿物为毒砂时,自然金与黄铁矿-黄铜矿关系密切. 相似文献
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江西茅排金矿矿物学找矿标志 总被引：1，自引：0，他引：1
黄铁矿和石英是主要的载金矿物。黄铁矿形态标型、成分标型、热电性标型和石英红外光谱标型特征具有指导找矿意义。江西茅排金矿区270m中段47勘探线及37～33勘探线的矿物标型特征为：黄铁矿形态见有八面体和五角十二面体，五角十二面体和八面体等聚形；出现空穴心型导电和混合型导电黄铁矿，若为电子心型导电黄铁矿，其热电动势和热电系数的绝对值相对较大；黄铁矿成分中检测出Cu；石英相对吸光度（37～33勘探线）DH2O 0.940 3, DCO2 0.1961, DCO2/DH2O0.259 1,略低于矿区研究样品的平均值（DH2O1.3267,DCO20.3090,DCO2/DH2O0.3382）.表明该处应位于矿体的中上部，矿体向下有一定的延伸。 相似文献
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为探讨新桥(S-Fe-Cu-Au)矿田的成因,笔者在近10年野外系统观察的基础上,通过对野外地质的系统分析研究和部分硫、铅同位素测试,认为新桥矿田的形成经历了两期成矿作用,即沉积成矿作用和与岩浆活动有关的成矿作用。沉积作用形成了菱铁矿矿体和胶黄铁矿矿石等,而岩浆作用是形成块状硫化物矿体的主要原因。硫化物矿体围绕岩体具有岩体→磁铁矿、黄铁矿→黄铁矿、黄铜矿和自然金→黄铁矿和铅、锌矿的分布特征,原生金矿体具有围绕岩体呈环状分布的地质特征。形成富的块状硫化物矿体的成矿流体可能为类似矿浆的富硫化物流体。 相似文献
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Mineralogy of the Boroo Gold Deposit in the North Khentei Gold Belt,Central Northern Mongolia 
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下载免费PDF全文 Mineral assemblages and chemical compositions of ore minerals from the Boroo gold deposit in the North Khentei gold belt of Mongolia were studied to characterize the gold mineralization, and to clarify crystallization processes of the ore minerals. The gold deposit consists of low‐grade disseminated and stockwork ores in granite, metasedimentary rocks and diorite dikes. Moderate to high‐grade auriferous quartz vein ores are present in the above lithological units. The ore grades of the former range from about 1 to 3 g/t, and those of the latter from 5 to 10 g/t, or more than 10 g/t Au. The main sulfide minerals in the ores are pyrite and arsenopyrite, both of which are divisible into two different stages (pyrite‐I and pyrite‐II; arsenopyrite‐I and arsenopyrite‐II). Sphalerite, galena, chalcopyrite, and tetrahedrite are minor associated minerals, with trace amounts of bournonite, boulangerite, geerite, alloclasite, native gold, and electrum. The ore minerals in the both types of ores are variable in distribution, abundance and grain size. Four modes of gold occurrence are recognized: (i) “invisible” gold in pyrite and arsenopyrite in the disseminated and stockwork ores, and in auriferous quartz vein ores; (ii) microscopic native gold, 3 to 100 µm in diameter, that occurs as fine grains or as an interstitial phase in sulfides in the disseminated and stockwork ores, and in auriferous quartz vein ores; (iii) visible native gold, up to 1 cm in diameter, in the auriferous quartz vein ores; and (iv) electrum in the auriferous quartz vein ores. The gold mineralization of the disseminated and stockwork ores consists of four stages characterized by the mineral assemblages of: (i) pyrite‐I + arsenopyrite‐I; (ii) pyrite‐II + arsenopyrite‐II; (iii) sphalerite + galena + chalcopyrite + tetrahedrite + bournonite + boulangerite + alloclasite + native gold; and (iv) native gold. In the auriferous quartz vein ores, five mineralization stages are defined by the following mineral assemblages: (i) pyrite‐I; (ii) pyrite‐II + arsenopyrite; (iii) sphalerite + galena + chalcopyrite; (iv) Ag‐rich tetrahedrite‐tennantite + bournonite + geerite + native gold; and (v) electrum. The As–Au relations in pyrite‐II and arsenopyrite suggest that gold detected as invisible gold is mostly attributed to Au+1 in those minerals. By applying the arsenopyrite geothermometer to arsenopyrite‐II in the disseminated and stockwork ores, crystallization temperature and logfs2 are estimated to be 365 to 300 °C and –7.5 to –10.1, respectively. 相似文献
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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. 相似文献
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陕西略阳铧厂沟金矿床金的赋存状态研究 总被引：1，自引：0，他引：1
陕西略阳县铧厂沟金矿床为一正在开采的小型金矿床。利用野外观察、显微镜观察、电子探针扫描等综合分析技术对金矿石中金的赋存状态进行了研究。结果表明,金主要以独立矿物相存在,金的载体矿物主要为黄铁矿,其次为石英、白云石、黄铜矿、砷黝铜矿。金矿物均为自然金(成色为945～982),未发现含银自然金及银金矿等矿物。金的嵌布类型有包裹金、裂隙金、粒间金和连生金4种。矿石中自然金的粒度主要以显微微粒金(0.010～0.005 mm)为主(约占44%),其次是显微细粒金(0.020～0.010 mm)(约占22%)和显微极微粒金(0.005～0.001 mm)(约占19%)。显微中粒金—巨粒金数量较少(约占14%),但其面积含量较高(约占57%),对于矿石品位和储量来说非常重要。还讨论了铧厂沟金矿床自然金嵌布特征的地质意义以及金成色较高的成因。 相似文献
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Abstract: Through a study, particularly an X-ray photoelectron spectroscopy (XPS or ESCA) analysis, of gold-bearing arsenopyrite and pyrite in Carlin-type gold deposits of Guangxi, China, and hydrothermally synthesized gold-bearing pyrite and marcasite, the authors have found that these minerals contain “invisible gold” whose binding energy is lower than that of native gold (Au°). Therefore they suggest that gold occurs in a negative charge state in these sulphide minerals as it replaces some sulphur and is combined with sulphur with the covalent bond. This paper also preliminarily discusses the possibility of its formation from the chemistry and geochemistry of gold, crystal chemistry of arsenopyrite, pyrite and marcasite and geochemical environment. 相似文献
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The Hadamengou gold deposit is located in western part of the northern margin of the North China craton. It is a hydrothermal deposit related to alkaline magmatism. Dissolution of Au, Fe from pyrite and iron oxide （including magnetite and hematite） individual minerals in the three main types of ore shows： in iron oxides （magnetite and hematite）, Au and Fe were dissolved simultaneously and their solubilities are positively correlated, which means Au is mainly chemical-bonded （lattice gold） and/or colloidal-adsorbed in iron oxides; while in pyrite, on the contrary, Au dissolution obviously lags behind Fe and the solubility of Au shows negative relationship with that of Fe, which indicates Au is mainly hosted as grains of elemental gold （or native gold） within pyrite. Previous studies revealed that the Hadamengou gold deposit is characterized by intensive K-feldspathization and holds high content of iron oxides occasionally replaced by sulfides, which was caused by oxidizing K-enriched alkaline fluids under a stretching geodynamic setting. These geological features, together with the high Au-content in iron oxides, comparable with that of the Olympic Dam deposit in South Australia, suggest that this deposit is the first example of iron oxide-type gold deposits in China. 相似文献
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金赋存状态的研究,不仅可为金矿选冶提供技术参数,还有成因和化探等方面的意义。通过玲珑金矿大开头矿区金及主要矿石矿物的电子探针分析,显示出金只以独立金矿物相形式;金矿物主要为银金矿和含银自然金;金矿物以裂隙金、粒问金和包体金存在于黄铁矿或石英等颗粒中,但主要是存在于黄铁矿的裂隙中和硫化物与石英之间的晶体间隙中。金矿形态有极细的脉状、角砾状、麦粒状、浑圆粒状和不规则粒状等;粒状金矿物粒度细小、多在10μm左右;细脉状金的脉宽多在1-5μm之间。以黄铁矿为主的硫化物化学成分中几乎不舍金,金仅呈独立金矿物相。根据金与硫化物和石英的相嵌关系,探讨了本区金成矿作用过程。 相似文献
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Mineral Paragenesis of the Lepanto Copper and Gold and the Victoria Gold Deposits, Mankayan Mineral District, Philippines 总被引：5，自引：0，他引：5
Rene Juna R. CLAVERIA 《Resource Geology》2001,51(2):97-106
Abstract: Mineral paragenesis of the alteration, ore and gangue minerals of the Lepanto epithermal copper‐gold deposit and the Victoria gold deposit, Mankayan Mineral District, Northern Luzon, Philippines, is discussed. The principal ore minerals of the Lepanto copper‐gold deposit are enargite and luzonite, with significant presence of tennantite‐tetrahedrite, chalcopyrite, sphalerite, galena, native gold/electrum and gold‐silver tellurides. Pervasive alteration zonations are commonly observed from silicification outward to advanced argillic then to propylitic zone. The ore mineralogy of the Lepanto copper‐gold deposit suggests high fS2 in the early stages of mineralization corresponding to the deposition of the enargite‐luzonite‐pyrite assemblage. Subsequent decrease in the fS2 formed the chalcopyrite‐tennantite‐pyrite assemblage. An increase in the fS2 of the fluids with the formation of the covellite‐digenite‐telluride assemblage caused the deposition of native gold/electrum and gold‐silver tellurides. The principal ore minerals of the Victoria gold deposit are sphalerite, galena, chalcopyrite, tetrahedrite and native gold/electrum. The alteration halos are relatively narrow and in an outward sequence from the ore, silica alteration grades to illitic‐argillic alteration, which in turn grades to propylitic alteration. The Victoria gold mineralization has undergone early stages of silica supersaturation leading to quartz deposition. Vigorous boiling increased the pH of the fluids that led to the deposition of sulfides and carbonates. The consequent decrease in H2S precipitated the gold. Gypsum and anhydrite mainly occur as overprints that cut the carbonate‐silica stages. The crosscutting and overprinting relationships of the Victoria quartz‐gold‐base metal veins on the Lepanto copper‐gold veins manifest the late introduction of near neutral pH hydrothermal fluids. 相似文献
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安徽白岭金矿金的赋存状态研究 总被引：2，自引：0，他引：2
白岭金矿位于下扬子台坳、长江褶断隆起带中段。金矿体赋存于三叠系中统铜头尖组中，矿体形态呈不规则脉状。矿石类型主要有以含金褐铁矿为主的氧化矿石和以含金黄铁矿为主的原生矿石两大类。载金矿物主要有黄铁矿、褐铁矿、石英、伊利石、黄铜矿等。通过矿相鉴定，单矿物含金分析、物相分析、多点分析、电子探针分析等，查明了金的赋存状态。金矿物以自然金为主，其次为银金矿。金的粒度较细，主要为中细粒显微金。金的嵌布类型有包体金、晶隙金、裂隙金。金的成色较高，平均为906．5。金主要呈矿物态存在。 相似文献
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