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1.
粤北瑶岭钨矿矿化类型多样性与叠加性研究 总被引：3，自引：0，他引：3
粤北地处南岭钨锡成矿带的西南部,区内已发现众多规模大小不同的矿床(点),组成了著名的钨矿化集中区.瑶岭是其中一个中型石英脉型黑钨矿床,由于长期开采,瑶岭钨矿山原保有的黑钨矿资源储量濒临枯竭.2004年,在矿区南部碳酸盐岩与花岗岩岩体的接触带附近发现了夕卡岩型白钨矿化,不久又在矿区中深部的花岗岩体中发现了受断裂构造控制的构造蚀变型白钨矿工业矿化,揭示了钨矿化类型的多样性和叠加性.通过对区内不同类型钨矿化分布规律总结,将为钨矿化集中区新一轮的钨矿地质找矿工作提供新启示. 相似文献
2.
铜陵地区矽卡岩型独立金矿成矿深度探讨 总被引：1，自引：0，他引：1
采用矿床地质法和流体包裹体压力计法,对铜陵地区包村、朝山矽卡岩型独立金矿床的成矿深度进行了估算。据成矿相关岩体特征、金矿体延深、矿石特征等推断金矿化发生于浅成—中浅成环境。根据不同矿化阶段石英、方解石中流体包裹体的显微测温结果,估算成矿压力为650×105～850×105Pa,成矿深度介于2.5～3.2km,与矿床地质特征反映的成矿深度基本吻合,也与国内外同类矿床研究结果相符。综合认为铜陵地区矽卡岩型独立金矿床成矿深度为中浅成,脆性构造裂隙空间的压力骤然降低引起的流体不混溶和流体沸腾是金富集成矿的主要原因。 相似文献
3.
中国东部冰长石—绢云母型低温浅成热液金矿 总被引：5，自引：0，他引：5
中国东部许多金矿床产在中生代火山岩中,前人将其归于火山热液型矿床,作者将其划为冰长石-绢云母型低温浅成热液矿床,并讨论了其主要特征.许多产在变质岩和花岗岩中金矿过去分别归于变质热液和岩浆热液或者统称中温或中低温热液矿床,其中一部分作者也将其归于冰长石-绢云母型低温浅成热液矿床.这种矿床斑岩型金矿在空间上叠加,在国外有例子,在国内虽有争议,但有可能存在.文中讨论了美洲西部太平洋岛弧与中国东部矿床类型组合类似,但成矿时代有所差别,并从板块构造角度对比进行解释.作者强调指出,由于我国东部成矿时代老,剥蚀作用使得我们对这种矿床认识产生困难,但只要努力一定能打开找矿新思路. 相似文献
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5.
祁雨沟含金角砾岩筒中的冰长石-方解石组合及其矿床地质意义 总被引：6，自引：0，他引：6
通过野外地质、岩相学、拉曼光谱和电子探针分析，对祁雨沟2号和4号含金角砾岩筒中冰长石-方解石蚀变矿物组合特征进行了描述。含金角砾岩筒成矿作用分为两期：面状矿化和脉状矿化。面状矿化的蚀变主要有阳起石化、绿色黑云母化、绿泥石化、冰长石化、硅化、绿帘石化、黄铁矿化、碳酸盐化和少量的绢云母化。脉状矿化蚀变为硅化、绢云母化和少量的碳酸盐化。通过对角砾岩筒的蚀变与成矿作用关系研究，认为冰长石-方解石蚀变与含金角砾岩金成矿作用是同期，从而确定祁雨沟含金角砾岩筒是一个典型的低硫型浅成低温热液型金矿床。 相似文献
6.
粤北地区锡矿主要有石英脉带型锡矿、矽卡岩型锡矿、矽卡岩-破碎带复合型锡矿、脉状锡铅锌多金属矿、花岗岩风化壳型锡矿、云英岩型锡矿和砂锡矿等类型。根据区域成矿地质和物化探异常等特征,认为粤北地区石英脉型锡矿与矽卡岩-破碎带复合型锡矿具有良好的找矿前景,前者可作为今后该区域锡矿的主要找矿类型。根据区域成矿地质特征划分为5个找矿远景区,即锯板坑—瑶岭找矿远景区、杉木洞—禾尚田找矿远景区、大东山找矿远景区、岭脚找矿远景区、谢家山找矿远景区。 相似文献
7.
大东山锡矿田矿化类型复杂,其中矽卡岩型锡矿规模大,可分含锡矽卡岩型和硫化物矽卡岩型。岩体区有脉状和面状云英岩产出,前者多具锡矿化,后者具钨矿化。燕山第四期花岗岩是锡(钨)成矿母岩,含SiO274.96%~75.28%,K2O+Na2O7.37%~8.54%,K2O>Na2O,与南岭地区钨锡成矿岩体具有相似的岩石化学特征。锡矿成因类型可划分为接触交代型、侵入岩浆热液型和风化矿床。根据成矿地质条件,认为在接触带寻找硫化物矽卡岩、硫化物型锡矿有较大前景,而在岩体区具有寻找云英岩型钨矿的潜力。 相似文献
8.
Geology and Mineralization at the Dajing Tin-polymetallic Ore Deposit, Inner Mongolia, China 总被引：6，自引：1，他引：6
Abstract: Dajing is a large-scale tin–polymetallic ore deposit in north China with Sn, Cu, Pb, Zn, Ag, and minor elements such as Co and In. The deposit is controlled by a passage-host structure system. Two groups of NE direction faults such as F2 and F1 are characterized by sinistral and multiphase activities, and the syn-ore NE faults with their derivative faults nearly in N-S direction constitute an important structure system as channelway for ore fluid. Around F2 fault (mineralization center), metallic elements display horizontal zoning outwards from Sn, Cu to Cu, Sn, Pb, Zn, Ag and to Pb, Zn, Ag. Controlled by sinistral pull-apart vein system, the WNW direction host structure yielded the ore vein to "W" shape on horizontal plan while to staircase shape on vertical profile. Multiperiodic activities of the host structures system lead to multistage of ore mineralization. Four mineralization stages are recognized in the main mineralization, i.e. 1) cassiterite–arsenopyrite–quartz stage, 2) cassiterite-sulfide (or Cu–poly–metallic mineralization) stage, 3) massive pyrite stage, and 4) galena-sphalerite stage. Besides, fluid activities are identified here at the pre-mineral stage of the formation of quartz veins and sheared deformation, and at the post-mineral stage of quartz–calcite–fluorite deposition.
The earlier tin-rich ore solution raised from NE faults and its nearly N-S derivatives filled the NW-WNW direction fractures, and formed tin ore veins. Subsequent mineralization of Cu-polymetallic stage, pyrite stage and galena-sphalerite stage, overlapping on the same fracture system, sequentially expanded outwards from the fractures, and produced different kinds of ore types and mineralization zoning. 相似文献
The earlier tin-rich ore solution raised from NE faults and its nearly N-S derivatives filled the NW-WNW direction fractures, and formed tin ore veins. Subsequent mineralization of Cu-polymetallic stage, pyrite stage and galena-sphalerite stage, overlapping on the same fracture system, sequentially expanded outwards from the fractures, and produced different kinds of ore types and mineralization zoning. 相似文献
9.
Abstract. The Meng'entaolegai In-rich Ag-Pb-Zn deposit is located in the eastern part of Inner Mongolia. It is one of the In-richest deposits in China. Large amounts of quartz and sulfide minerals constitute a hydrothermal quartz-sulfide vein deposit within a Hercynian acidic granite massif, which occupies an area of about 400 km2 . Thirty-six orebodies, controlled strictly by the E-W trend faults, are found in the orefield of 6 km in length from east to west and 200 to 1,000 m in width from south to north. The ore minerals are mainly galena, sphalerite and pyrite, and subordinate chalcopyrite, arsenopyrite, cassiterite and stannite with many Ag-minerals. The gangue minerals are mainly quartz, calcite, sericite and chlorite. Economic components of the deposit are dominated by Pb andZn (reserves of Pb and Zn are 0.17 Mt and 0.37 Mt, and their grades are 1 % and 2.3 %, respectively), with Ag, Sn, In and Cd (1,800 t Ag, >2,000 t Sn, >500 t In and 1,800 t Cd) as by-products. Indium is highly enriched in ores and its contents are 9 to 295 ppm in ores and 85 to 2,660 ppm in sphalerite. Analytical results show that the ore-forming fluid of this deposit contains 0.8–3.5 ppm In and 4–36 ppm Sn, and the two elements show a very good positive correlation with a correlation coefficient of 0.8672, while the correlation between In and Zn in the ore-forming fluids, with a correlation coefficient of 0.5723, is not as good as that between In and Sn. This indicates that indium has an affinity with tin in the ore-forming fluids. The authors think that this is probably the main reason why those In-rich deposits spread over the world are simultaneously enriched in tin. 相似文献
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11.
Abstract: The skarns and genesis were studied of the Huanggang Fe‐Sn deposit and the nearby Sumugou Zn‐Pb deposit in Inner Mongolia, China. In the Huanggang mine, Nos. 1 to 4 Fe ore bodies are arranged along a calcareous horizon from proximal to distal in this order to a granite intrusion named Luotuochangliang, while Sn ore body is situated near another granite intrusion named 204. According to the distance from the granitic intrusions, mineral assemblages in skarns are systematically changed. Garnet is the most predominant skarn mineral throughout the deposit. Hastingsitic amphiboles, however, predominate in the proximal skarns. Fluorite is common in the proximal skarns, while instead calcite is common in the distal skarns. Chlorite is characteristically present only in No. 3 ore body, and chlorite geothermometry gives near 300C for the mineralization of later stage. When garnet crystal shows zonal structure, isotropic andraditic garnet occupies the core, and is surrounded with anisotropic less‐andraditic garnet. The presence of white skarn along the boundary between main skarns and host sedimentary rocks confirms relatively reducing environment prevailing as a whole in the studied area. However, the compositional relation between coexisting garnet and clinopyroxene demonstrates that relatively oxidizing condition was achieved for garnet skarn and magnetite ore in the distal, Nos. 2 to 4 Fe ore bodies and Sumugou deposit, compared to that for garnet skarn in the proximal, No. 1 and Sn ore bodies. Preliminary study on the tin content of garnets in the studied area revealed a certain degree of contribution brought from granitic intrusives since the early stage of skarn formation, irrespective of proximal or distal. Oxygen isotope study on garnet, magnetite, quartz and skarn calcite, as well as hydrogen isotope study on hastingsitic amphibole, demonstrates mainly meteoric water origin for the skarn– and ore‐forming solutions. The occurrence of Sn, W, Mo and F minerals indicates that those elements were mainly supplied to the deposit later than the formation of skarns and iron ores, overlapping to them. These constraints allow to delineate the formation model of the deposit as follows (Fig. 10): At the time of late Jurassic to early Cretaceous, felsic activity occurred in this region as a part of Yanshanian magmatism, and formed granitic intrusions as well as thick volcanic piles on the surface. The circulation of meteoric water was provoked by the heat brought by the intrusions. By this circulation, much amount of iron was extracted from andesites of the Dashizhai Formation, and precipitated as skarns and magnetite ores along calcareous horizons near the bottom of the Huanggangliang Formation. Subsequently, volatile‐rich fluids with Sn, W and Mo were expelled from the solidifying granitic magmas, and precipitated these metals in the pre‐existing skarns and ores. 相似文献
12.
The Ashele Deposit: A Recently Discovered Volcanogenic Massive Sulfide Cu-Zn Deposit in Xinjiang, China 总被引：1，自引：0，他引：1
Abstract: The Ashele Cu-Zn deposit is a recently discovered volcanogenic massive sulfide deposit in Xinjiang, Northwestern China. It is the largest Cu-Zn deposit in this type of deposits in China, which were formed in the early period of later Palaeozoic Era. This deposit is hosted within a suit of bimodal submarine volcanic rocks of the Ashele Formation of Lower-Middle Devonian System formed in an environment of paleocontinental margin rift setting. Lensoid orebodies occur between spilitic rocks developed at footwall and quartz-keratophyric tuff at hanging wall. Zonation of metal elements in the Ashele mine is one of typical volcanic-related exhalative Cu-Zn sulfide deposits in the world. Black ores enriched in Pb, Zn and Ag occurs on the top of the No. 1 orebody in the Ashele deposit, yellow ores enriched in Cu in the middle part, and the chalcopyritization stringer below the massive sulfide ores. Zonation of ore-structure in the No. 1 orebody is also apparent and corresponds to the zoning of elements, i. e. lamellar and/or banded sulfide-sulfate ores on the top, massive sulfide ores in the middle, and stockwork veinlets associated with altered breccia pipe on the bottom. Four epochs of mineralization in the Ashele deposit has been recognized. The first period of syngenetic-exhalative deposition of sulfides is the main epoch of mineralization, and the ores deposited subsequently subjected to thermo-metamorphism at the second epoch, superimposed by hydrothermal mineralization at the third epoch, and weathered or oxidized at the fourth epoch.
More than 100 categories of minerals have been recognized in the Ashele mine, but only pyrite, chalcopyrite, sphalerite, tetrahedrite, galena, barite, quartz, chlorite, sericite, and calcite are dominant, making up various types of ores, and alteration pipes or horizons. Studies of ore petrology suggest that the massive ores were volcanogenic and deposited by exhalative process. 相似文献
More than 100 categories of minerals have been recognized in the Ashele mine, but only pyrite, chalcopyrite, sphalerite, tetrahedrite, galena, barite, quartz, chlorite, sericite, and calcite are dominant, making up various types of ores, and alteration pipes or horizons. Studies of ore petrology suggest that the massive ores were volcanogenic and deposited by exhalative process. 相似文献
13.
柬埔寨KW铜金矿床产于安山质火山岩中,矿化受NE-NNE向断裂控制,为中低温热液脉型矿化;矿体一般长80~640m,厚0.13~7.05m,品位Cu0.56%~3.48%,Au0.36×10-6~2.56×10-6;矿石金属矿物以黄铜矿、黄铁矿、毒砂为主,非金属矿物以石英为主,含少量绢云母、绿泥石、方解石等,近矿围岩蚀变以硅化-绢云母化-绿泥石化。矿区安山岩属高钾低钠的钙碱性岩类,矿石与安山岩有相似的稀土配分特征,显示成矿与安山质岩浆活动有密切的成因联系。矿区青磐岩化、细脉状石膏较为普遍,显示可能存在与次火山岩体有关的蚀变岩型矿化,该类型矿化是下一步找矿突破的重要方向。 相似文献
14.
湖南骑田岭芙蓉锡多金属矿田锡的赋存状态及迁移形式 总被引：1，自引：0，他引：1
芙蓉矿田锡矿床按成因可分为构造蚀变带-矽卡岩复合型、构造蚀变带型、蚀变岩体型、矽卡岩型、脉状云英岩型等五种类型。各类型矿体中锡主要以锡石锡的形式出现,其分布率由92.17~97.77%,硫化锡、胶态锡、硅酸锡的分布率<8%。锡元素在钠长石化成矿作用阶段,很可能是以氧的络阴离子SnO33-、氢氧络阴离子〔Sn(OH)6〕2-的形式迁移;在云英岩化成矿作用阶段,主要以氟的络合物,如Na2SnF6,Na2〔Sn(OH、F)6,〕SnF4,K2SnF6等形式搬运;到了绿泥石化锡石硫化物阶段,锡又以硫化锡酸盐、硫化物(Na2SnS3,SnS2,SnS)和氯的络合物(Na2SnC l6)、氟的络合物等形式进行迁移和搬运。 相似文献
15.
青海同仁双朋西金铜矿矿床地质特征及矿床成因 总被引：3，自引：0，他引：3
在翔实的野外工作基础上,对青海省同仁县双朋西金铜矿床矿石与围岩的微量元素、稀土元素、流体包裹体和同位素地球化学特征展开了系统研究。研究结果表明,金矿石和花岗闪长岩的稀土元素配分模式具有相似性,均为轻稀土元素富集型,具负铕异常,基本上无铈异常,暗示它们之间存在成因联系;成矿流体为中高温、低盐度、中等密度、中等压力流体,且以含碳质为特征;铅、硫同位素结果均反映出成矿物质主要来源于深源。据此认为区内矿化是与中高温岩浆热液作用有关的矽卡岩型金铜矿化,属于印支-燕山期同一构造-岩浆作用的产物。 相似文献
16.
皖东地区毛山金矿蚀变矿物特征及其地质意义 总被引：1，自引：1，他引：1
毛山金矿属于中小规模金矿山。通过对矿体两侧的黄铁绢英岩进行热分析与透射电镜观察研究以及对绢云母的热分析及其化学成分研究，认为水热蚀变、硅化及矿化程度均较高，成矿热液可能来自矿区南部和深部，该地区是寻找隐伏矿体的靶区。黄铁绢英岩中出现微细石膏，反映在成矿过程中可能出现过氧化阶段，是出现富矿的显示。进而提出乳白色石英脉中出现石膏晶体是寻找金矿化的新的找矿标志。 相似文献
17.
The Makeng iron deposit is located in the Yong’an-Meizhou depression belt in Fujian Province, eastern China. Both skarn alteration and iron mineralization are mainly hosted within middle Carboniferous-lower Permian limestone. Five paragenetic stages of skarn formation and ore deposition have been recognized: Stage 1, early skarn (andradite–grossular assemblage); Stage 2, magnetite mineralization (diopside–magnetite assemblage); Stage 3, late skarn (amphibole–chlorite–epidote–johannsenite–hedenbergite–magnetite assemblage); Stage 4, sulfide mineralization (quartz–calcite–fluorite–chlorite–pyrite–galena–sphalerite assemblage); and Stage 5, carbonate (quartz–calcite assemblage). Fluid inclusion studies were carried out on inclusions in diopside from Stage 2 and in quartz, calcite, and fluorite from Stage 4.Halite-bearing (Type 1) and coexisting two-phase vapor-rich aqueous (Type 3) inclusions in the magnetite stage display homogenization temperatures of 448–564 °C and 501–594 °C, respectively. Salinities range from 26.5 to 48.4 and 2.4 to 6.9 wt% NaCl equivalent, respectively. Two-phase liquid-rich aqueous (Type 2b) inclusions in the sulfide stage yield homogenization temperatures and salinities of 182–343 °C and 1.9–20.1 wt% NaCl equivalent. These fluid inclusion data indicate that fluid boiling occurred during the magnetite stage and that fluid mixing took place during the sulfide stage. The former triggered the precipitation of magnetite, and the latter resulted in the deposition of Pb, Zn, and Fe sulfides. The fluids related to magnetite mineralization have δ18Ofluid-VSMOW of 6.7–9.6‰ and δD of −96 to −128‰, which are interpreted to indicate residual magmatic water from magma degassing. In contrast, the fluids related to the sulfide mineralization show δ18Ofluid-VSMOW of −0.85 to −1.04‰ and δD of −110 to −124‰, indicating that they were generated by the mixing of magmatic water with meteoric water. Magnetite grains from Stage 2 exhibit oscillatory zoning with compositional variations in major elements (e.g., SiO2, Al2O3, CaO, MgO, and MnO) from core to rim, which is interpreted as a self-organizing process rather than a dissolution-reprecipitation process. Magnetite from Stage 3 replaces or crosscuts early magnetite, suggesting that later hydrothermal fluid overprinted and caused dissolution and reprecipitation of Stage 2 magnetite. Trace element data (e.g., Ti, V, Ca, Al, and Mn) of magnetite from Stages 2 and 3 indicate a typical skarn origin. 相似文献
18.
Hideki Wada 《Mineralium Deposita》1978,13(2):201-220
Pyrometasomatic lead-zinc ore deposits of the Kamioka mine occur in the Hida metamorphic complex of central Japan. The pyrometasomatic ore deposition was followed by small scale hydrothermal ore deposition. Flaky graphite characteristically occurs in skarn, ores and in the surrounding crystalline limestone. 13C values of graphite in the skarn and the ores are close to those of graphites in the crystalline limestone. Graphite in the skarn and ores is considered to be remains of graphite in the crystalline limestone which was replaced by the skarn and the ores. At the pyrometasomatic stage, the oxygen fugacity of fluid would control the carbon isotopic composition of calcite precipitated. On the assumption that graphite played a role of oxygen buffer, the oxygen fugacity of the fluid was estimated to be from 10–31,4 to 10–301 bars at 350 °C and total pressure of 1,000 bars. The predominant carbon species in the fluid would be carbon dioxide. The 13C value of total carbon in fluid was estimated to be –3.6±1.7 (PDB) for the Tochibora and Maruyama deposits of the Kamioka mine, and the oxygen fugacity in the fluid was probably constant during the pyrometasomatic stage. It is likely that an important source of carbon was the carbon remained after the decarbonation of crystalline limestone. Oxygen isotopic studies on calcite of pyrometasomatic and hydrothermal stages revealed that meteoric water was an important source for most of the oxygen in fluid of both stages. 相似文献
19.
通过对新疆锡矿的研究，划分出8个锡矿成矿带，即诺尔特、阿勒泰、克拉麦里、克拉玛依北、阿拉套、哈尔克─库米什、南天山、星星峡。归纳出新疆锡矿矿化类型有3类：热液型、矽卡岩型和砂矿型，分析了每种类型的分布和产出特征，总结了新疆锡矿的成矿规律。 相似文献
20.
芙蓉矿田白腊水锡矿矿化特征及找矿意义 总被引：7，自引：1，他引：6
白腊水锡矿床是在新一轮地质大调查中发现,并进行了初步评价的大型矿床.该区断裂构造发育,构造线以NNE-NE向为主,并控制着锡矿带的分布.通过该矿床矿化特征的研究认为:①白腊水矿区到处发育的石英脉可能是锡矿化作用的同期产物;②矿脉内的锡矿化可能极不均匀,高品位的地段一般在构造破碎强烈地方;③该区不同岩体的成矿元素含量明显高于地壳花岗岩类岩石的平均值,有些高出数十倍,具良好的含矿性;④该地区的岩浆岩的稀土元素组成特征极为相似,岩(矿)石稀土元素球粒陨石标准化曲线具有相同的变化特点,显示出岩(矿)石可能为同一岩浆房演化的产物;同时反映出矿化可能与细粒花岗岩关系更密切. 相似文献