云南盈江地瓜山钨锡矿矿化特征     

张志平  邹顺坤 《云南地质》2010,29(2):152-155

地瓜山钨锡矿是近年滇西发现的高温热液石英脉型钨锡矿床,矿床产于喜马拉雅期麻蓬岭岗侵入体(Eηγb)与高黎贡山群变质岩接触带内带,近南北向剪切断裂(裂隙)带的有利部位,该区及外围实现找矿重大突破完全有可能。  相似文献   

铅物相分析选择性溶剂、浓度及浸取时间探讨   总被引：1，自引：0，他引：1  

朱松  张丽微  韦克桥  余虹 《云南地质》2010,29(2):210-214

个旧铅矿石以铅钒、白铅矿、砷铅矿、方铅矿、铅铁钒为主要赋存状态。试验探讨浸取时间、选择性溶剂、及其浓度对各赋存状态下铅的溶解情况,制定适合个旧地区铅矿石的物相分析方法,取得满意效果。  相似文献   

云南建水荒田铅锌矿控矿因素   总被引：1，自引：0，他引：1  

周伟家  陈凤艳  谭兆波  李维忠 《云南地质》2010,29(1):41-44

已探明7个铅锌矿体,赋存在上二叠统玄武岩／下二叠统灰岩接触带,接触带角砾岩为容矿岩石,且强烈重晶石化蚀变,可作为找矿标志。  相似文献   

腾冲勐蚌铌钽锡矿矿床成矿地质条件     

白平  陈海军  李建洪  田燕红 《云南地质》2010,29(3):295-298

矿床含两条脉状物,分别赋存于燕山晚期第一阶段(V1)和第二阶段(V2)花岗岩云英岩化带中,V1为半风化、全风化铌钽矿,V2则为原生锡矿。共生黑钨矿、白钨矿。成因与构造、中酸性侵入岩密切相关。  相似文献   

青海省拉脊山地区某铜矿成因浅析     

张杰 《四川地质学报》2010,30(3):302-304

青海省拉脊山地区某铜矿处于祁连加里东褶皱系拉脊山优地槽褶皱带中段,北拉脊山深大断裂夹持地带。矿区地层为上寒武统六道沟群下部火山岩组玄武岩段（∈3ld1^b）。F4断裂构造破碎带为铜矿富集场所。文章论述了铜矿点地质特征、矿体特征及矿石类型,最后归结出该矿体成因类型属于构造破碎带低温热液型铜矿。  相似文献   

成矿流体的流体包裹体同位素示踪探讨   总被引：6，自引：0，他引：6       下载免费PDF全文

范建国  倪培  田京辉 《地质找矿论丛》2000,15(3):275-281

流体包裹体中流体的同位素组成,广泛应用在推测流体来源及确定流体成矿年龄方面。由于流体包裹体一般是多成因及多期的,在用流体同位素研究成矿流体时,需要注意到注流体包裹体的捕获是否与成矿同期。本文主要以Ｒｂ－Ｓｒ同位素为例探计了流体包裹体包裹体同位素在成矿流体来源及确定成矿年代方面的意义。  相似文献   

Komatiites and nickel sulfide ores of the Black Swan area,Yilgarn Craton,Western Australia. 2: Geology and genesis of the orebodies   总被引：1，自引：0，他引：1  

S.?E.?Dowling  S.?J.?BarnesEmail author  R.?E.?T.?Hill  J.?D.?Hicks 《Mineralium Deposita》2004,39(7):707-728

The Black Swan Ultramafic Succession hosts a number of magmatic Fe–Ni–Cu–PGE sulfide ore shoots, ranging from high grade massive ore to low grade disseminated sulfides. Of these, the most economically significant is the Silver Swan massive sulfide orebody, associated with the basal contact of the succession. The deposit varies in thickness between 5 and 20 m, reaches a N–S strike length of 75 m, extends for at least 1.2 km of vertical plunge and is open at depth. Overlying matrix (net-textured) ore is rare. Inclusions of dacite are abundant within the lower 5 m of the massive sulfide. They range from angular fragments through smooth sinuous and plumose morphologies to fine lace-like intergrowths with the sulfide matrix, and comprise variable proportions of cores of porphyritic dacite and carapaces with skeletal plagioclase phenocrysts. Dynamic crystallisation and kinetic melting textures in the carapaces indicate that the inclusions have been heated to various temperatures, some well above their liquidus temperature. The composition of the inclusions ranges from a perfect match with the immediate footwall dacites to mixtures of dacite with up to 30% komatiite. The consistent thickness of the inclusion-bearing basal layer within the massive sulphide is interpreted as the extent of 3-D physical connectivity between the inclusions and a partially molten underlying hybrid layer. Primary contacts between the Silver Swan massive sulfide orebody and overlying ultramafic rocks are marked by thin rinds containing coarse-grained chevron-textured chromites with skeletal textures. Compositions of these chromites match those from Kambalda, Perseverance and other localities, and are inconsistent with a metamorphic origin. They are interpreted as markers of primary magmatic contacts. The combination of this feature with the general paucity of matrix ore implies that the massive ore accumulated and solidified before the accumulation of the overlying thick sequence of olivine cumulates. Taken together with observations on the internal fractionation of platinum group elements within the massive ores, these observations are consistent with a model where the massive ore were emplaced at the floor of a small partially drained lava tube. The floor of the tube had been previously heated by passage of large volumes of lava, such that it had reached its melting range. The felsic inclusions within the ore are the result of buoyant ascent of partially molten substrate into the ore magma. This constitutes strong evidence for the operation of thermo-mechanical erosion during ore emplacement. The disseminated Cygnet and Black Swan orebodies show a number of distinctive features. Cygnet contains a assemblage of clasts and inclusions which are interpreted as the result of rip-up, transport and redeposition of sulfides from a pre-existing massive sulfide orebody, of which Black Duck may be a remnant. The Black Swan orebody, by contrast, does not show xenolithic features, but is characterised by an association of sulfide blebs with segregation vesicles, and by unusually coarse-grained olivine. The Black Swan orebody is interpreted as the result of transport of sulfide droplets within a lava charged with a suspended load of coarse olivine crystals.Editorial handling: Peter Lightfoot  相似文献   

Stibnite microstructures as imprints of fault movement     

Jean-Philippe Bellot  Laurent Bailly  Catherine Lerouge  Vincent Bouchot 《Mineralium Deposita》2004,39(5-6):576-582

The natural deformation of stibnite in relation to the kinematic history of a regional fault is resolved using microstructural analysis of massive stibnite along the Biards Fault in the Massif Central (France). Stibnite underwent intra-crystalline deformation associated with a strong linear and planar anisotropy. Lepidoblastic textures, undulatory extinction of oriented grains, growth of antimony between these grains, and a colour change of stibnite from white to black, result from dynamic recrystallisation. A range of asymmetric microstructures indicate non-coaxial deformation and a left-lateral sense of shear, related to the movement of the fault zone. The computed displacement corresponds to the geological offsets measured along the fault. We conclude that stibnite has microstructurally recorded the bulk kinematics of its host fault zone.Editorial Handling: F. Tornos  相似文献   

川滇黔相邻区域铜铅锌金银矿床与峨眉火成岩省的关系探讨   总被引：3，自引：0，他引：3  

刘家铎  张成江  刘显凡  阳正熙  李佑国  吴德超 《矿物岩石》2003,23(4):74-79

通过对川滇黔相邻区热液或热液改造型Cu,Pb,Zn,Au,Ag矿床的地质特征,特别是峨眉火成岩省与该类矿床的成因关系的讨论认为：峨眉地幔柱活动是扬子地台西南缘最大的一次构造—岩浆热事件,对该区Au,Ag,Pb,Zn,Hg,Te,Sb,Se等热液—热液改造型矿床的成矿起着非常重要的控制作用。除可能提供了少量的成矿物质外,更重要的是引起了强烈的壳幔相互作用,造成大区域尺度的异常高热流场,对成矿流体的形成、循环、演化起了重要的促进作用,为成矿、特别是富矿的形成提供了充足的物质条件和热动力条件。  相似文献   

The Mantos Blancos copper deposit: an upper Jurassic breccia-style hydrothermal system in the Coastal Range of Northern Chile     

L. E. Ramírez  C. Palacios  B. Townley  M. A. Parada  A. N. Sial  J. L. Fernandez-Turiel  D. Gimeno  M. Garcia-Valles  B. Lehmann 《Mineralium Deposita》2006,41(3):246-258

The Upper Jurassic Mantos Blancos copper deposit (500 Mt at 1.0% Cu), located in the Coastal Range of northern Chile, displays two superimposed hydrothermal events. An older phyllic alteration probably related to felsic magmatic–hydrothermal brecciation at ∼155 Ma, and younger (141–142 Ma) potassic, propylitic, and sodic alterations, coeval with dioritic and granodioritic stocks and sills, and dioritic dikes. Main ore formation is genetically related to the second hydrothermal event, and consists of hydrothermal breccias, disseminations and stockwork-style mineralization, associated with sodic alteration. Hypogene sulfide assemblages show distinctive vertical and lateral zoning, centered on magmatic and hydrothermal breccia bodies, which constitute the feeders to mineralization. A barren pyrite root zone is overlain by pyrite-chalcopyrite, and followed upwards and laterally by chalcopyrite-digenite or chalcopyrite-bornite. The assemblage digenite–supergene chalcocite characterizes the central portions of high-grade mineralization in the breccia bodies. Fluid inclusions show evidence of boiling during the potassic and sodic alteration events, which occurred at temperatures around 450–460°C and 350–410°C, and salinities between 3–53 and 13–45 wt% NaCl eq., respectively. The hydrothermal events occurred during episodic decompression due to fluid overpressuring, hydrofracturing, and sharp changes from lithostatic to hydrostatic conditions. Sulfur isotope results of hypogene sulfide minerals fall in a narrow range around 0 per mil, suggesting a dominance of magmatic sulfur. Carbon and oxygen isotopic data of calcites from propylitic alteration suggest a mantle-derived carbon and oxygen isotope fractionation due to low-temperature alteration.  相似文献