共查询到20条相似文献，搜索用时 500 毫秒
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Massimo Chiaradia Dave Banks Robert Cliff Robert Marschik Antoine de Haller 《Mineralium Deposita》2006,41(6):565-573
The origin of the hypersaline fluids (magmatic or basinal brine?), associated with iron oxide (Cu–U–Au–REE) deposits, is controversial. We report the first chlorine and strontium isotope data combined with Cl/Br ratios of fluid inclusions from selected iron oxide–copper–gold (IOCG) deposits (Candelaria, Raúl–Condestable, Sossego), a deposit considered to represent a magmatic end member of the IOCG class of deposit (Gameleira), and a magnetite–apatite deposit (El Romeral) from South America. Our data indicate mixing of a high δ 37Cl magmatic fluid with near 0‰ δ 37Cl basinal brines in the Candelaria, Raúl–Condestable, and Sossego IOCG deposits and leaching of a few weight percent of evaporites by magmatic-hydrothermal (?) fluids at Gameleira and El Romeral. The Sr isotopic composition of the inclusion fluids of Candelaria, Raúl–Condestable, and El Romeral confirms the presence of a non-magmatic fluid component in these deposits. The heavy chlorine isotope signatures of fluids from the IOCG deposits (Candelaria, Raúl–Condestable, Sossego), reflecting the magmatic-hydrothermal component of these fluids, contrast with the near 0‰ δ 37Cl values of porphyry copper fluids known from the literature. The heavy chlorine isotope compositions of fluids of the investigated IOCG deposits may indicate a prevailing mantle Cl component in contrast to porphyry copper fluids, an argument also supported by Os isotopes, or could result from differential Cl isotope fractionation processes (e.g. phase separation) in fluids of IOCG and porphyry Cu deposits. 相似文献
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安徽庐枞地区铁-铜矿成矿规律与找矿 总被引：4，自引：0，他引：4
构建庐枞地区燕山期Fe、Cu、Au成矿系列,根据成矿构造背景和含矿岩浆岩特点,将其划分为3个成矿亚系列:以矽卡岩型Cu、Mo、Au矿为主的亚系列,以矽卡岩型Fe及Fe、Cu矿为主的亚系列和以玢岩铁矿为主的火山--次火山岩型铁矿亚系列。该区具较大找矿远景的靶区有:①沙溪铜(金)找矿靶区;②清水塘—岳山铁、锌找矿靶区;③井边—巴家滩铜矿找矿靶区。其中,井边—巴家滩地区成矿地质条件良好,深部存在斑岩型铜矿的可能性较大,具有寻找大型斑岩型铜矿的找矿远景,应对该区进行深入研究和普查评价工作,以实现庐枞盆地内部铜矿找矿的突破。经预测,应对泥河、罗河和龙桥等大型超亿吨铁矿外围进行勘探,以达到建立20～25亿吨大型钢铁基地的目标。 相似文献
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FU Zhongyang XU Xiaochun HE Jun FAN Ziliang XIE Qiaoqin DU Jianguo CHEN Fang 《《地质学报》英文版》2019,93(1):88-110
The Tongling ore district is one of the most economically important ore areas in the Middle–Lower Yangtze River Metallogenic Belt, eastern China. It contains hundreds of polymetallic copper–gold deposits and occurrences. Those deposits are mainly clustered(from west to east) within the Tongguanshan, Shizishan, Xinqiao, Fenghuangshan, and Shatanjiao orefields. Until recently, the majority of these deposits were thought to be skarn-or porphyry–skarn-type deposits; however there have been recent discoveries of numerous vein-type Au, Ag, and Pb-Zn deposits that do not fall into either of these categories. This indicates that there is some uncertainty over this classification. Here, we present the results of several systematic geological studies of representative deposits in the Tongling ore district. From investigation of the ore-controlling structures, lithology of the host rock, mineral assemblages, and the characteristics of the mineralization and alteration within these deposits, three genetic types of deposits(skarn-, porphyry-, and vein-type deposits) have been identified. The spatial and temporal relationships between the orebodies and Yanshanian intrusions combined with the sources of the ore-forming fluids and metals, as well as the geodynamic setting of this ore district, indicate that all three deposit types are genetically related each other and constitute a magmatic–hydrothermal system. This study outlines a model that relates the polymetallic copper–gold porphyry-, skarn-, and vein-type deposits within the Tongling ore district. This model provides a theoretical basis to guide exploration for deep-seated and concealed porphyry-type Cu(–Mo, –Au) deposits as well as shallow vein-type Au, Ag, and Pb–Zn deposits in this area and elsewhere. 相似文献
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介绍大型矿集区的一种富集模式:多重圈闭等温场模式——以铜陵狮子山矿田为例 总被引：1，自引：0，他引：1
狮子山矿田是安徽铜陵地区乃至长江中下游地区重要的矿田之一。该矿田目前已探明铜、金等大中小型矿床十多处,按赋存标高自下而上依次为:冬瓜山深部斑岩Cu、冬瓜山Cu、胡村Cu、花树坡Cu、大团山Cu(Au)、老鸦岭Cu、东、西狮子Cu(Au)、鸡冠石Ag、Au、Cu、Pb、Zn,包村Au(Cu)、白芒山Au等矿床,达到大型-超大型规模,引起了国内外矿床地质学家的广泛关注。近年来又发现并勘查出几个独立岩金矿床,且在矿田深部1000多米处又发现了新的矿体,标志着该区找矿工作进入了一个新的阶段。多种矿床类型共存,铜矿与金矿配对,矿床(体)呈多层产出,是矿田的显著特色。矿田内业已发现矽卡岩型、层控矽卡岩型、斑岩型、中低温热液型和风化—淋滤型等矿床;既有以内生作用为主,又有以沉积作用为主的矿床,及二者的复合类型;铜、金可共生、伴生,也可形成各自独立的矿床;自深部斑岩铜矿至C2+3—T2中层状、脉状矿床,成矿垂深大。它们虽产于不同层位的地层中,主要表现为多层楼成矿特点,但其产出受统一构造、岩浆岩等多重圈闭因素制约而构成的统一的等温的岩浆-流体-成矿系统之中。在某种意义上说,狮子山矿田是铜陵地区乃至整个长江中下游成矿带的缩影和典... 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＳｈｏｓｈｏｎｉｔｅｓａｒｅｐｏｔａｓｓｉｃｉｇｎｅｏｕｓｒｏｃｋｓｗｈｉｃｈｏｃｃｕｒｍａｉｎ－ｌｙｉｎｓｕｂｄｕｃｔｉｏｎ－ｒｅｌａｔｅｄｔｅｃｔｏｎｉｃｓｅｔｔｉｎｇｓ（Ｍｏｒｒｉｓｏｎ,１９８０）．Ｔｈｅｙａｒｅｃｏｍ... 相似文献
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New data on platinum mineralization in ores, metasomatic rocks, concentrates, and tailings and wastes of some gold–polymetallic, Au–Bi, Cu–Mo porphyry, Cu–Ni, and titanomagnetite ore deposits and occurrences of the Upper Amur Region are presented. The contents of platinoids, Au and Ag in multimetal ores of gold-polymetallic, Au–Bi, Cu–Mo porphyry, Cu–Ni, and titanomagnetite ore deposits and ore occurrences are given. In addition, recommendations on the necessity of continuing scientific studies, revision, and resampling works in the search for platinoids in other complex ores of deposits and occurrences of the Upper Amur Region are given. 相似文献
9.
The weights-of-evidence is a data-driven method that provides a simple approach to integration of diverse geo-data set information. In this study, we will use weights-of-evidence to build a model for predicting tracts in the Ahar–Arasbaran zone of Urumieh-Dokhtar orogenic belt (northwestern Iran) that are favorable for porphyry copper deposits. Weights of evidence are a data-driven method requiring known deposits and occurrences that are used as training points in the evaluated area. This zone hosts two major porphyry Cu deposits (The Sarcheshmeh deposit contains 450 million tonnes of sulfide ore with an average grade of 1.13 % Cu and 0.03 % Mo and Sungun deposit, which has 500 million tonnes of sulfide reserves grading 0.76 % Cu and 0.01 % Mo), and a number of subeconomic porphyry copper deposits are all associated with Mid- to Late Miocene diorite/granodiorite to quartz-monzonite stocks. Five evidential layers including geology, alteration, geochemistry, geophysics, and faulting are chosen for potential mapping. Weight factors were determined based on the applied method to generate last mineral prospectivity map. The studied area reduces to less than 11.78 %, while large zones are excluded for further studies. This result represents a significant area reduction and may help to better focus on mineral exploration targeting porphyry copper deposits in the Ahar–Arasbaran zone. 相似文献
10.
德兴大型铜金矿集区构造环境和成矿流体研究进展 总被引：48，自引：0，他引：48
江西德兴地区是我国东部成矿带中的大型矿集区之一,集中了铜厂斑岩铜矿、银山多金属矿和金山金矿等大型、超大型矿床。它又处在中国东南部大地构造的关键部位,因此,对德兴大型铜金矿集区的研究始终与该地区的构造背景及演化相伴随。目前对该地区构造格局的认识以NW侧的九岭地体与SE侧的怀玉地体沿赣东北深大断裂带的碰撞拼贴为主流;在这两个地体于晚元古代碰撞拼贴之后,该地区所经历的主要是板内(陆内)的构造活动。德兴大型铜金矿集区的成矿作用与燕山期构造—岩浆活动有着成因上的密切联系,而德兴地区的中元古界地层成矿元素含量较高,不同程度地为本区铜厂、金山、银山等矿床提供了成矿物质。成矿流体的研究成果已表明不同的矿床有不同的流体过程:铜厂斑岩铜矿成矿早阶段以岩浆派生流体为主、而晚阶段(主要成矿阶段)有大气降水的大量参与;银山多金属矿成矿流体主要为大气降水来源;金山金矿的成矿流体则以变质水为重要来源。 相似文献
11.
In this study, both the fuzzy weights of evidence (FWofE) and random forest (RF) methods were applied to map the mineral prospectivity for Cu polymetallic mineralization in southwestern Fujian Province, which is an important Cu polymetallic belt in China. Recent studies have revealed that the Zijinshan porphyry–epithermal Cu deposit is associated with Jurassic to Cretaceous (Yanshanian) intermediate to felsic intrusions and faulting tectonics. Evidence layers, which are key indicators of the formation of Zijinshan porphyry–epithermal Cu mineralization, include: (1) Jurassic to Cretaceous intermediate–felsic intrusions; (2) mineralization-related geochemical anomalies; (3) faults; and (4) Jurassic to Cretaceous volcanic rocks. These layers were determined using spatial analyses in support by GeoDAS and ArcGIS based on geological, geochemical, and geophysical data. The results demonstrated that most of the known Cu occurrences are in areas linked to high probability values. The target areas delineated by the FWofE occupy 10% of the study region and contain 60% of the total number of known Cu occurrences. In comparison with FWofE, the resulting RF areas occupy 15% of the study area, but contain 90% of the total number of known Cu occurrences. The normalized density value of 1.66 for RF is higher than the 1.15 value for FWofE, indicating that RF performs better than FWofE. Receiver operating characteristics (ROC) were used to validate the prospectivity model and check the effects of overfitting. The area under the ROC curve (AUC) was greater than 0.5, indicating that both prospectivity maps are useful in Cu polymetallic prospectivity mapping in southwestern Fujian Province. 相似文献
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Zircon U–Pb,Molybdenite Re–Os and K‐feldspar 40Ar/39Ar Dating of the Bolong Porphyry Cu–Au Deposit,Tibet, China 
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下载免费PDF全文 Xiangping Zhu Guangming Li Huaan Chen Dongfang Ma Hanxiao Huang 《Resource Geology》2015,65(2):122-135
The Bolong porphyry Cu–Au deposit is a newly discovered deposit in the central Tibetan Plateau, and is ranked as the second largest copper deposit discovered to date in the Bangong‐Nujiang metallogenic belt in China. Three granodiorite porphyry phases occur within the Bolong porphyry Cu–Au deposit. Phyllic alteration is widespread on the surface of the deposit, and potassic alteration occurs at depth, associated with granodiorite porphyries. The copper and gold mineralization is clearly related to the potassic and phyllic alteration. Multiple chronometers were applied to constrain the timing of magmatic–hydrothermal activity at the Bolong deposit. Zircon U–Pb geochronology reveals that the granodiorite porphyry phases were emplaced at ca. 120 Ma. Re–Os data of four molybdenite samples from quartz–molybednite veinlets yielded an isochron age of 119.4 ± 1.3 Ma. The plateau age of hydrothermal K‐feldspar from the potassic alteration zone, analyzed by 40Ar/39Ar dating, is 118.3 ± 0.6 Ma, with a similar reverse isochron age of 118.5 ± 0.7 Ma. Therefore, the magmatic–hydrothermal activity occurred at ca. 120–118 Ma, which is similar in age to the neighboring Duobuza porphyry copper deposit. The period of 120–118 Ma is therefore important for the development of porphyry Cu–Au mineralization in the central Tibetan Plateau, and these porphyry deposits were formed during the final stages of the northward subduction of the Neo‐Tethys Ocean. 相似文献
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二十一站-宝兴沟( 铜) 金矿床( 点) 位于上黑龙江断陷盆地的东南部。区域地质背景及典型矿床研究表明,矿床不仅受NE 向断裂构造控制,还受其同期的岩浆岩控制。对宝兴沟金矿床的流体包裹体测试结果、矿床围岩蚀变和与火山穹窿构造间的关系等研究,表明宝兴沟金矿可能是中硫型浅成低温热液型矿床,二十一站和十五里桥( 铜) 金矿床可能是高硫型浅成低温热液型矿床( 点) 。区域地质特征、遥感解译、航磁异常及Au、Ag、Cu 化探异常分布特征显示了本区可能存在两种环境的斑岩型--浅成低温热液型成矿热液系统。在此基础上,结合铜元素化探异常和火山穹窿等特征,提出了在十五桥金矿床、二十一站铜金矿一带寻找斑岩型铜钼矿化类型,在NW、NNE 向构造带内找寻与浅成低温热液系统有关的矿床。 相似文献
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Analysis of the spatial relations of gold ore occurrences and the enclosing geological environment in the Chukotka Autonomous Okrug (ChAO) has shown that Au–quartz ore occurrences in turbidites are located predominantly in areas of the Early Cretaceous granitoid magmatism with the thick collision-type continental crust. The Cu–Au porphyry deposits are located in areas with complete development of Early Cretaceous magmatism within the outer zone of the Okhotsk–Chukchi volcanoplutonic belt (OChVB). The Au–Ag epithermal deposits are located in the areas of the Late Cretaceous granitoid magmatism within the inner and outer zones of the OChVB. The prospects of island-arc complexes for searching for Kuroku-type Au-bearing ore objects are available. 相似文献
15.
成矿元素巨量聚集的混沌机制——斑岩型和构造蚀变岩型矿床例析 总被引：1，自引：1，他引：0
成矿元素含量的变化受控于成矿系统内部的动力学过程,具有较强的随机性与混沌特征,对其变化特征的定量刻画有助于深入理解成矿过程,并为找矿预测提供理论依据。本文以三江普朗斑岩型铜矿的Cu元素与胶东大尹格庄构造蚀变岩型金矿的Au元素品位序列为研究对象,运用混沌时间序列分析法中的相空间重构技术、吸引子的关联维及最大Lyapunov指数解析了Cu与Au元素品位序列的分布特征。结果显示:斑岩型铜矿强矿化和中矿化Cu元素品位的饱和关联维介于4.42与9.69之间,饱和嵌入维介于25与28之间,最大Lyapunov指数介于0.0021与0.0661之间,弱矿化勘探线Cu元素关联维没有出现饱和现象,最大Lyapunov指数随着嵌入维的增大,由正数变为负数;构造蚀变岩型金矿的强矿化勘探线Au元素的关联维为3.18,饱和嵌入维为23,最大Lyapunov指数为0.0082,而中矿化和弱矿化勘探线Au元素的关联维没有出现饱和现象,且随着嵌入维的增大,最大Lyapunov指数由正数变为负数,表明斑岩型中-强矿化地区的Cu元素和构造蚀变岩型强矿化区域的Au元素品位序列具有混沌动力学特征,而弱矿化地区的Cu元素及中弱矿化地区的Au元素品位序列则具有更强的随机性特征;同时,具有混沌特征的斑岩型铜矿的饱和嵌入维和关联维及最大Lyapunov指数的均值都大于蚀变岩型矿床,说明斑岩型铜矿比蚀变岩型矿床的元素具有更强混沌特性与更复杂的控制因素,如温度、硫化作用、流体不混溶、蚀变叠加等。 相似文献
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Renguang ZUO 《Resource Geology》2011,61(3):296-303
An exploration targeting model for Gangdese porphyry copper deposit in Tibet, China, is constructed based on (i) the age of porphyry intrusions within Gangdese magmatic arc; (ii) the regional‐scale normal E–W, N–S and N–E striking faults; and (iii) comprehensive anomalously high concentrations of Cu‐Mo‐Au‐Ag‐Pb‐Zn. These targeting elements are derived from geological map and geochemical dataset, and are integrated by weights of evidence with the aid of geographic information system (GIS). The resulting prospectivity for porphyry copper deposits delineated by posterior probability demonstrates that the target areas extend along the Yaluzangbujiang River and contain the two large deposits, Qulong and Chongjiang, located in the eastern and central part of the Gangdese belt, respectively. These results indicate that the proposed exploration targeting model is a potential tool to map regional‐scale mineral prospectivity. The target areas with high values of favorability, especially where high concentrations of Cu‐Mo‐Au‐Ag‐Pb‐Zn are present, are the potential areas for finding undiscovered porphyry copper deposits. 相似文献
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西藏改则县多不杂斑岩型铜金矿床勘查模型 总被引：16，自引：0，他引：16
西藏改则县多不杂斑岩型铜金矿床是近年来由西藏地质五队在班公湖-怒江成矿带发现的一个具超大型规模的铜金矿床,系继玉龙、驱龙、雄村、甲玛等超大型铜矿床之后的又一重大找矿突破,也是班公湖-怒江成矿带的第一个超大型斑岩铜金矿。多不杂斑岩型铜金矿产于早白垩世花岗闪长斑岩及其与早侏罗世曲色组变长石石英砂岩的接触带,区域成矿地质背景得天独厚,岩浆活动频繁,为斑岩型铜金矿的成矿提供了有利的条件。该矿床具有典型的斑岩型铜矿的蚀变分带,在斑岩体及其围岩由内向外形成钾硅化带、粘土化带、青磐岩化带、角岩化带。地球物理勘查表明,含矿斑岩区为低视电阻率、高视极化率异常区;1:1万土壤测量显示,斑岩铜矿产于高背景区,并与强度高、浓集中心明显的Cu、Au、Ag、Mo元素的化探综合异常相对应,在空间上尤其与Cu、Au异常分布高度吻合。1:5万水系沉积物测量表明,Au、Ag、As、Sb、Cu、Pb、Zn元素高异常常与激电探测异常吻合。本文通过综合研究初步总结建立了适合本区地质-地球物理-地球化学综合勘查模型。通过勘查和初步评价,在矿区外围新发现了波龙、拿顿、拿若、赛角、尕尔勤、铁格龙、地堡那木岗等斑岩矿(床)点,并最终形成多龙斑岩型铜金矿集区,对该区域找矿起到指导作用。 相似文献
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This paper discusses the enrichment and depletion regularities for porphyry copper-molybdenum ore deposits in different regions and varied deposit genetic types in the same area, taking three porphyry copper-molybdenum ore deposits (i.e., the Chengmenshan in Jiangxi, Wunugetushan in Inner Mongolia, Baishantang in Gansu) and two copper deposits in Gansu Province (the Huitongshan skarn deposit and Gongpoquan composite deposit) as case studies. The results show that porphyry Cu-Mo deposits or skarn copper deposits include both enrichment of the ore-forming elements and associated elements, and depletion of some lithophile dispersed elements, rare earth elements (REE) and some major elements. And the depleted elements vary with deposits, having generality and their own features. On a deposit scale, the positive anomalies of enriched elements and negative anomalies of depleted elements follow in a sequence to comprise regular anomaly models of spatial structures. The exploration in the Tongchang deposit in Jiangxi and Huitongshan deposit in Gansu suggests that anomaly models play a key role in the identification of mineral occurrences and deposits compared to one single enriched element anomaly. And the anomaly models exert a critical effect on the optimization of prospecting targets and their potential evaluation. 相似文献
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普朗铜矿床是格咱岛弧多金属成矿带的印支期代表产物，属产于石英二长斑岩、石英闪长玢岩内接触带的超大型斑岩型铜（金）矿床，受复式斑岩体控制作用显著；但矿区东部大脉状铜矿体、南部金矿（化）体则严格受控于断裂构造，明显具后期成矿作用的叠加。笔者通过对矿区外围北矿段、东矿段和南矿段矿床地质特征、矿体特征、矿石组构特征的深入研究，结合区域成矿地质背景，认为普朗铜（金）矿床是由多期次、多成因、多成矿阶段叠加而成的次火山-热液矿床，与印支期复式斑岩体与断裂构造、节理裂隙与矿床的形成关系密切；北部外围深部具有斑岩型铜矿的良好潜力，而东矿段深部、南矿段深部则分别是寻找大脉状铜矿、金矿的有利找矿靶区。 相似文献