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甘肃阳山金矿带构造岩浆演化与金矿成矿 总被引：10，自引：1，他引：9
甘肃阳山金矿带位于西秦岭南部,结合同位素测年资料发现阳山金矿区在侏罗纪早期、白垩纪早期及第三纪早期曾发生3期岩浆活动;稳定同位素分析结果显示,矿石中石英的流体包裹体δD值为-75‰～-56‰,δ18OH2O为3.7‰～12.2‰,矿脉中黄铁矿及辉锑矿的δ34S为-2.2‰～-0.7‰,表明阳山金矿成矿热液及成矿物质主要来自于岩浆作用;构造变形分析显示该区在三叠纪曾发生韧性变形,在侏罗纪早期产生韧-脆性变形;侏罗纪晚期以后区内构造转为脆性,早期以逆冲推覆构造为主,晚期主要为脆性伸展活动。结合该区地质构造演化史认为本区的3期岩浆活动与区域伸展作用有关,而与岩浆侵入有关的多期岩浆热液活动是促成阳山金矿床形成的主要因素。 相似文献
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Ore-Forming Fluid Characteristics of the Dayingezhuang Gold Deposit, Jiaodong Gold Province, China 总被引：27，自引：0，他引：27
Liqiang Yang Jun Deng Chunying Guo Jing Zhang Shaoqing Jiang Bangfei Gao Qingjie Gong Qingfei Wang 《Resource Geology》2009,59(2):181-193
The Dayingezhuang gold deposit is located in the central part of the Zhaoping Fault Zone, which is one of the most important gold-hosting faults in the Jiaodong gold province of China. Dayingezhuang is a typical large-scale shear zone-hosted disseminated gold deposit with superimposed silver mineralization. Fluid inclusion (FI) petrography and microthermometry, and analysis of oxygen and hydrogen isotopes for fluid inclusions were conducted to determine the characteristics of the ore-forming fluids and the processes of silver mineralization. Microthermometry data of FI indicated that ore-forming fluids are characterized by low salinity and low density. Homogenization pressures of FI are estimated at 20 × 105 –220 × 105 Pa. The change in ore-forming fluids from K2 SO4 type to NaCl type indicates the superposition of two hydrothermal mineralizing events. Ore-forming fluids were dominated by magmatic components in the early mineralization period, and affected by meteoric waters in the late period. Gold may have been transported as Au-S or Au-Cl complexes, whereas silver was transported as Ag-Cl complexes. Early fluid boiling and later fluid mixing are thought to be two of the main factors causing the deposition and superimposing of gold and silver to form the large deposit. 相似文献
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Gold Grade and Tonnage Models of the Gold Deposits, China 总被引：4，自引：0，他引：4
Abstract: The gold grade and tonnage modelling is applied to some types of the gold deposits in China, including placer, Archaean lode, slate belt, Carlin, volcanogenic, skarn and Shandong Peninsula, among others. The Shandong Peninsula type denotes the gold deposit, which was formed in an intensely reshaped Archaean greenstone belt. The modelling results show: (1) the Archaean lode gold deposits of China are similar to the Homestake type in gold grades. (2) The Chinese slate belt type gold deposits are marked by moderately lower gold grades but considerably larger ore volumes than the similar type elsewhere. (3) The Carlin style gold deposits of China are identified by higher Au grades but evidently smaller sizes in comparison with their counterparts in western North America. (4) The volcanogenic (continental) style is similar to Sado epithermal veins in gold grade‐tonnage models and general characteristics while volcanogenic gold deposits of the oceanic subgroup contrast with Kuroko‐type deposits in the gold grade model. But the Chinese volcanogenic (oceanic) subtype (Palaeozoic age) shows similar higher gold grades to those of the Palaeozoic Kuroko‐type deposits elsewhere. (5) Porphyry and skarn gold deposits tend to have a large size but low grade. (6) Less than half of the Shandong Peninsula gold deposits are of ore volumes exceeding the 50th intercept of the relevant gold tonnage model, implying possible undiscovered gold deposits with a larger size in the peninsula. (7) In general, Chinese gold deposits of larger sizes tend to have lower gold grades in relation to gold grade models. (8) Gold grade‐tonnage models can be effectively influenced by how to include or exclude non‐economic gold resources in the modelling. Ore volumes of gold deposits actually to some extent depend on gold grades. Consequently, the way of including or excluding low‐grade values may effect a gold grade‐tonnage model and cause different interpretation of the modelling results. This is particularly true to the gold deposits, which generally show an inverse correlation between gold grade and tonnage. 相似文献
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Solomon Tadesse 《Gondwana Research》2004,7(2):481
The Lega Dembi Primary Gold Deposit in southern Ethiopia is related to the shear zone-hosted vein in the Neoproterozoic metamorphosed volcano-sedimentary succession of greenschist- to amphibolite-facies metamorphism. The rocks consists of a sequence of biotite-feldspar-quartz schists, carbonaceous mica-schists, amphibolites and basic to ultrabasic rocks. This unit is separated from a foot wall biotite gneiss by a major shear zone. The ore bodies are hosted in the volcano-sedimentary sequence and consist of swarms of quartz veins, lenses, and stockworks that propagated along mesoscale ductile to brittle-ductile shear zones.The mineralization is defined by a complex paragenesis of gold in association with Cu-Pb-Zn-Fe sulphides, tellurides and sulphosalts. The presence of Ni-bearing minerals in amphibolites of the host sequence, together with the ore mineral association, suggests an origin related to mafic volcanism. 相似文献
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Nobutaka Shimada Tomoki Nakamura Yasuo Morinaga Yoshihito Shikama 《Resource Geology》2005,55(2):91-100
Abstract. The presence of invisible gold was confirmed in arsenian pyrite from the Hishikari epithermal gold deposit, Kagoshima, Japan, by means of EPMA and SIMS analyses. The relative concentration of invisible gold may be positively correlated with As contents (0.01 to 10.37 wt%) of fine-grained arsenian pyrite which commonly occurs in the auriferous quartz veins. Although arsenian pyrite occurs widely in any mineralization stage with electrum and other sulfide, sulfosalts, selenide or telluride minerals, arsenian pyrites having higher As contents accompanied by invisible gold occur dominantly in the middle stage of fine-adularia-quartz and in the late stage of coarse-quartz rather than in the early stage of columnar-adularia. 相似文献
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贵州水银洞金矿床矿石特征及金的赋存状态 总被引：24，自引：8，他引：24
详细阐述了水银洞金矿床的矿石物质组成、化学成分、结构构造、矿物嵌布特征，初步划分了成矿期及成矿阶段，对金的赋存状态进行了初步研究。 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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LI Nan DENG Jun YANG Liqiang JI Xingzhong QIU Kunfeng GUO Yaoyu HAN Ri 《《地质学报》英文版》2014,88(Z2):755-756
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ZHANG Liang YANG Liqiang WANG Zhongliang GUO Linnan LIU YueLIU Yue LI Ruihong HUANG Tao ZHANG Ruizhong 《地质学报》2014,88(Z2):1586-1587
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Gold Distribution in Pyrite of the Senjedeh Gold Deposit,Muteh Mining District, NW of Iran 总被引：1，自引：1，他引：0
Zahra Nourian Ramsheh MAO Jingwen Mohammad Yazdi XIANG Junfeng Iraj Ras Fariborz Masoudi 《《地质学报》英文版》2014,88(Z2):829-830
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以漠滨金矿围岩地球化学特征和矿物流体包裹体组成为基础，模拟特定体系水－岩相互作用实验，研究结果表明，漠滨金矿的成矿元素Au主要源于赋矿围岩－－板溪群五强溪组一套浅变质碎屑砂岩、砂质板岩和凝灰质板岩。Cl^-在中低温热液体系中能与Au形成稳定络合物的形式进行运移，因此Cl^-在该区Au成矿过程中起着相当重要的作用。成矿热液流体中Au主要以金硫、金氯络合物形式在溶液中迁移，阴离子∑S、Cl^-对金的活化、迁移及沉淀起主导作用。溶液中硫氯离子浓度、溶液酸碱度及反应温度是金活化、迁移及沉淀的决定性因素。 相似文献
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深部过程对哀牢山金矿带金成矿的制约 总被引：2，自引：0，他引：2
本文通过矿化剂来源及其相关地质事件的研究，确定了金成矿与深部过程的关系。结果表明，哀牢山金矿带成矿之所以集中在喜马拉雅早期，主要是通过喜马拉雅早期受地壳拉张控制的富S深源流体上升，加入原在该区浅层断裂中循环的大气成因贫S流体中，从而使这种贫S的流体转化成富含足够S，进而能够大规模浸取Au的成矿流体来实现的。 相似文献