共查询到20条相似文献，搜索用时 906 毫秒
1.
The C. S. A. Mine is located near Cobar, central New South Wales. The copper-zinc-lead ores occur in Early Devonian rocks of the Cobar Super-Group. Lower greenschist (slate-grade) metamorphism has developed elongate lenticular ore systems parallel to the extension (down-dip) lineation in cleavage. FeS contents of sphalerites coexisting with pyrite and pyrrhotite outside and inside pressure shadows indicate much higher pressures (7.7 to 9.0 kbar) than those inferred from stratigraphic reasoning and the low metamorphic grade. The homogeneous distribution of Fe in sphalerites suggests equilibration with pyrite-pyrrhotite; and concentrations of Co and Ni in iron sulphides, and Mn, Cd and Cu in sphalerite are too low to have influenced phase relations in the FeS-ZnS pseudobinary system. The anomalously high pressures are therefore ascribed to reequilibration of sphalerite compositions with a monoclinic pyrrhotite-pyrite buffer. The FeS contents of the reequilibrated sphalerites apparently reflect the differing mean stress domains that exist outside and inside pressure shadows. This suggests that reequilibration occurred under the same stress distribution as produced the original pressure shadows, and implies FeS dissolution during the decay of the cleavage-producing structuro-metamorphic event. The commonly observed scatter of sphalerite compositions in low grade assemblages appears to record micro-scale mean stress domains, and thereby testifies to the pressure sensitivity of the mole percent FeS contents. 相似文献
2.
《矿物学报》2013,(Z1)
Optical cathodoluminescence microscopy (CLM) can provide very useful information both on mineral zoning formed during crystal growth and on variations in chemical composition of sphalerites which is reflected by their visible colors. Gem quality sphalerite crystals associated with dolomite, calcite and fluorite having 3 different visible colors - green, honey and brown - were studied to compare their mineral chemistry and CL characteristics. Electron microprobe analyses indicated essentially no significant differences in terms of major components. Although the common CL-quencher ferrous iron contents of all three were lower than 0.25 wt %, none of the sphalerites cathodoluminescenced: two (brown and honey) were non-CL, the green sphalerite showed very week CL in faint brown color. Other trace elements that were analyzed include Fe, Cd, Mn, Ag, Hg, In, Bi, Cu, Ge, and Ga. Fe, Cd, Ga and Cu were relatively higher than the others. Most significant differences with respect to the common trace elements include honey colored sphalerites are essentially Fe- and Cd-poor but rich in Ga, green sphalerites are Fe- and Cd- rich but poor in all the others, and brown sphalerites are rich in Cd. No conclusive relation between non-CL behavior of all three sphalerites and their trace element chemistry was established, however; low quantities of common CL activators in sphalerite crystal structures such as Mn, Cu, and In were the main cause of the non-CL behavior. 相似文献
3.
Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb-Zn Ore Deposit, Guizhou Province, China 总被引：2，自引：0，他引：2
ZHOU Jiaxi HUANG Zhilong ZHOU Guofu LI Xiaobiao DING Wei BAO Guangping 《《地质学报》英文版》2011,85(1):189-199
Trace elements and rare earth elements (REE) of the sulfide minerals were determined by inductively-coupled plasma mass spectrometry. The results indicate that V, Cu, Sn, Ga, Cd, In, and Se are concentrated in sphalerite, Sb, As, Ge, and Tl are concentrated in galena, and almost all trace elements in pyrite are low. The Ga and Cd contents in the light-yellow sphalerites are higher than that in the brown and the black sphalerites. The contents of Ge, Tl, In, and Se in brown sphalerites are higher than that in light-yellow sphalerites and black sphalerites. It shows that REE concentrations are higher in pyrite than in sphalerite, and galena. In sphalerites, the REE concentration decreases from light-yellow sphalerites, brown sphalerites, to black sphalerites. The ratios of Ga/In are more than 10, and Co/Ni are less than 1 in the studied sphalerites and pyrites, respectively, indicating that the genesis of the Tianqiao Pb–Zn ore deposit might belong to sedimentary-reformed genesis associated with hydrothermal genesis. The relationship between LnGa and LnIn in sphalerite, and between LnBi and LnSb in galena, indicates that the Tianqiao Pb–Zn ore deposit might belong to sedimentary-reformed genesis. Based on the chondrite-normalized REE patterns, δEu is a negative anomaly (0.13–0.88), and δCe does not show obvious anomaly (0.88–1.31); all the samples have low total REE concentrations (<3 ppm) and a wide range of light rare earth element/high rare earth element ratios (1.12–12.35). These results indicate that the ore-forming fluids occur under a reducing environment. Comparison REE compositions and parameters of sphalerites, galenas, pyrites, ores, altered dolostone rocks, strata carbonates, and the pyrite from Lower Carboniferous Datang Formation showed that the ore-forming fluids might come from polycomponent systems, that is, different chronostratigraphic units could make an important contribution to the ore-forming fluids. Combined with the tectonic setting and previous isotopic geochemistry evidence, we conclude that the ore-deposit genesis is hydrothermal, sedimentary reformed, with multisources characteristics of ore-forming fluids. 相似文献
4.
Jordanka Minčeva-Stefanova 《Mineralogy and Petrology》1971,16(1-2):28-43
Zusammenfassung In Verbindung mit ausführlichen Untersuchungen von 22 Zinkblenden mit einem FeS-Gehalt zwischen 0,9 und etwa 16 Mol% und der Überprüfung desKrauseschen Diagramms wird die Gültigkeit der linearen Abhängigkeita
0/FeS Mol% (nachSkinner, Barton undKullerud, 1959) auch für natürliche Zinkblenden mit einem FeS-Gehalt über 10 Mol% bestätigt.Zur Bestimmung des isomorphen Eisengehaltes in diesem Mineral wird auf die Bedeutung einer Gegenüberstellung des (nach der Formel vonSkinner, 1961) theoretisch berechneten und experimentell bestimmten Wertes vona
0 nach der Korrektur für Mn und Cd hingewiesen. Diese Gegenüberstellungen liefern wertvolle Angaben für genetische Auslegungen. Es werden die Ursachen erörtert, die bei einigen Zinkblenden Unterschiede zwischen dem berechneten und dem gemessenon Wert vona
0 bedingen.
Mit 4 Abbildungen 相似文献
On the possibility of using the unit cell constants of sphalerite to determine the isomorphous iron content
Summary The validity of the linear relationa 0/FeS mol per cent (according toSkinner, Barton andKullerud, 1959) is verified for natural sphalerites with FeS content over 10 mol per cent on the basis of detailed studies of 22 sphalerites with FeS content ranging from 0.9 to about 16 mol per cent and by means of a re-examination ofKrause's diagram.The importance and necessity of a comparison between calculated (by means ofSkinner's formula) and measured cell edges, after corrections for the effect of Mn and Cd, are pointed out for determining the isomorphous iron content in this mineral. Such comparisons give valuable clues for the genetic interpretation. The causes which determine differences between calculated and measured values ofa 0 in some sphalerites are discussed.
Mit 4 Abbildungen 相似文献
5.
6.
长期以来, 由于金属成矿的多期性及易受后期蚀变的干扰, 成矿时代的确定成为难题, 进而成为成矿机理、矿床勘探等研究的制约因素。本文以黄铁矿和闪锌矿这两种典型的矿石矿物为例, 回顾了利用40 Ar/39 Ar法直接确定成矿时代的研究现状, 探讨了其中的问题、可能的解决方法及以后的发展前景, 为进一步开展矿石矿物的40 Ar/39 Ar年代学提供参考。同时对采自辽宁丹东青城子矿中的黄铁矿和闪锌矿样品做了包裹体镜下观察和电子探针的元素分析, 以期更好地理解矿石矿物40 Ar/39 Ar法直接定年的潜力。 相似文献
7.
Summary Sphalerite is the major ore mineral in the Zn-rich, volcanic-hosted massive sulphide deposits of western Tasmania. These deposits have been affected by regional metamorphism to upper greenschist facies, and associated tectonic deformation related to the Devonian Tabberabberan Orogeny. The southern end of the Rosebery deposit has undergone metasomatic replacement related to a post-orogenic Devonian granite intrusion.Sphalerite from VHMS deposits in the Rosebery district varies widely in colour, grain size and texture. Compositional variation of the sphalerites was studied for three purposes (1) to investigate effects of the Devonian overprinting, (2) to provide pressure (depth) estimates at the time of Fe-S-O replacement during the Devonian, and (3) to deduce the effect ofa
FeS(a
S
2) on gold deposition and subsequent remobilisation.Sphalerite from the Rosebery deposit shows an FeS range from 2.0 to 20.0 mole%, with a bimodal distribution; a mode of 16.0 mole% FeS was noted for the F(J) lens where Devonian metasomatism prevailed, whereas a mode of 2.4–4.0 mol% FeS was found for the other lenses. Sphalerite from the Hercules deposit has a range of 2.0–10.0 mole% FeS, whereas sphalerite from the South Hercules deposit ranges from 4.0-12.0 mole% FeS. VHMS sphalerites also contain minor copper, manganese and cadmium.The bimodal distribution of FeS content in Rosebery sphalerite suggests that the primary VHMS mineralisation underwent at least two periods of post-depositional re-equilibration. The FeS content in sphalerite in equilibrium with hexagonal pyrrhotite and pyrite indicates that the Devonian replacement occurred at a pressure off 3.0 ± 0.5 kb, corresponding to 8.0 ± 0.1 km depth.The relationship between FeS content in sphalerite and gold grades at Rosebery, Hercules and South Hercules displays complex patterns that reflect either variations in the initial depositional conditions an the seafloor (pH, temperature anda
S
2), or later Devonian metamorphic and metasomatic recrystallisation.Zusammenfassung Zinkblende ist das dominierende Erzmineral in den Zn-reichen, in vulkanischen Gesteinen beheimateten, massiven Sulfidlagerstätten West-Tasmaniens. Diese Lagerstätten sind von einer Regionalmetamorphose der oberen Grünschieferfazies und einer assoziierten Deformation, die der devonischen Tabberabberan Orogenese zuzuschreiben ist, überprägt worden. Das Südende der Rosebery Lagerstätte ist von einer metasomatischen Verdrängung, die mit einer post-orogenen, devonischen Granitintrusion im Zusammenhang steht, erfaßt worden.Die Zinkblende von VHMS Lagerstätten des Rosebery Distriktes variiert weitgehend in ihrer Farbe, Korngröße und Textur. Die Variation der chemischen Zusammensetzung der Zinkblende wurde aus drei Gründen untersucht: (1) um die Effekte der devonischen Überprägung zu studieren, (2) um zu Abschätzungen des Druckes (Tiefe) zur Zeit der Fe-S-O Verdrängung während des Devons zu gelangen, und (3) um die Auswirkung vonaFeS (aS2) auf die Goldablagerung und folgende Remobilisation abzuleiten.Der FeS Gehalt der Zinkblende der Rosebery Lagerstätte reicht von 2.0 bis 20.0 Mol%, mit einer bimodalen Verteilung; ein Maximum bei 16.0 Mol% FeS ist für die F(J) Linse charakteristisch, wo devonische Metasomatose vorherrscht, während ein zweites Maximum bei 2.0–4.0 Mol% FeS bei den anderen Linsen festgestellt wurde. Der FeS Gehalt der Zinkblende der Süd-Hercules Lagerstätte reicht von 4.0 bis 12.0 Mol%. Die VHMS Zinkblenden führen auch untergeordnet Kupfer, Mangan und Cadmium.Die bimodale Verteilung des FeS Gehaltes in der Rosebery Zinkblende läßt vermuten, daß die VHMS Mineralisation, nach ihrer Bildung, von mindestens zwei Perioden der Reequilibrierung erfaßt worden ist. Der FeS Gehalt in der Zinkblende im Gleichgewicht mit hexagonalem Pyrrhotin und Pyrit weist darauf hin, daß die devonische Verdrängung bei einem Druck von 3.0 ± 0.5 kb, vergleichbar mit 8.0 ± 0.1 km Tiefe, stattgefunden hat.Der Zusammenhang des FeS Gehalt in der Zinkblende mit den Goldgehalten in Rosebery, Hercules und Süd-Hercules ist komplex und spiegelt entweder unterschiedliche, primäre Bildungsbedingungen am Meeresboden (pH, Temperatur undaS2), oder spätere, devonische metamorphe und metasomatische Rekristallisation wider.
With 14 Figures 相似文献
Petrologie und Geochemie der Zinkblende aus der kambrischen VHMS Lagerstätte im Roseberry-Hercules Distrikt, West-Tasmanien: Hinweise für Goldmineralisation und devonische, metamorphe-metasomatische Prozesse
With 14 Figures 相似文献
8.
Henry P. Schwarcz Steven D. Scott Stephen A. Kissin 《Geochimica et cosmochimica acta》1975,39(11):1457-1466
The FeS content of sphalerite, a minor phase in some meteorites, is strongly dependent on pressure when the sphalerite is in equilibrium with troilite. We have determined FeS contents for sphalerite in Bogou, Gladstone, Sardis and Odessa ; these, together with published data on Odessa and Campo del Cielo, have been used to calculate pressures of formation of meteorites, assuming that FeS-diffusion in sphalerite ceases at 350°C. Calculated pressures range from 0.2 to 3.1 kbar, corresponding to formation at centres of chondritic objects from 140 to 410 km in radius, or metallic objects of from 50 to 200 km radius. Formation at shallower depths would require the objects to have been correspondingly larger.All meteorites in this study are members of Ga-Ge group I. Inverse correlation between Ge content and pressure of formation suggests formation at various depths in a compositionally zoned (fractionated?) object. Comparison between our pressure estimates and radii estimated from cooling rates (Frickeret al., 1970, Geochim. Cosmochim. Acta34, 475–492) suggests that Odessa, Bogou and possibly other Group I meteorites formed in a single object with a radius between 400 and 180 km and an overall composition richer in metal than average chondrites. 相似文献
9.
Crystal chemistry of Fe-containing sphalerites 总被引：2，自引：0，他引：2
Cell dimensions and solvus properties of Fe-containing sphalerites, depending on temperature and sulfur fugacity, were investigated
using equilibrated powdered materials synthesized from elements and binary sulfides under vacuum. The Fe solvus in sphalerite,
determined by optical microscopy and microprobe analysis, are directly correlated with increasing temperature and decreasing
sulfur fugacity controlled by solid-state buffers. The increase of lattice parameters with Fe correlates with an increase
of FeS independent of sulfur fugacity up to 10 mol% FeS within ZnS. Above about 10 mol% the lattice parameters are strongly
depending on the sulfur fugacity controlled Fe3+/Fe2+ ratios. The Fe3+/Fe2+ ratios determined by Moessbauer spectroscopy and involving metal vacancies depend on the sulfur fugacity. The critical Fe2+ content determined by experimental simulations as well as the minimal Fe3+/ Fe2+ ratios agree with the required minimal Fe content for CuFeS2-DIS in sphalerite. The critical Fe2+ content also agrees with the change of Moessbauer signal from a singlet to a doublet for Fe2+ containing sphalerite. Pyrrhotite exsolutions in sphalerite caused by higher sulfur fugacity show orientationally intergrown
with the sphalerite matrix. Density data calculated from lattice parameters and composition are compared with experimental
density measurements.
Received: 25 April 2001 / Accepted: 14 February 2003 相似文献
10.
Abstract. Skeletal sphalerite with stellar, cruciform and snowflake-like (or cauliflower-like) shapes included in pyrite is widely found in the Dajing tin-polymetallic deposit. It occurs only in chalcopyrite-pyrite mineralization stage. The compositions of all sphalerites in the chalcopyrite-pyrite stage are characterized by high Cu content (3.9 - 7.0 wt% with a mean of 5.4 wt%), while the skeletal crystal sphalerite has higher zinc and cadmium contents, and lower copper and iron contents, compared with other sphalerites of the same stage. The skeletal crystal sphalerite in pyrite is possibly generated by exsolution. 相似文献
11.
东升庙多金属硫铁矿床闪锌矿特征及形成条件 总被引：2，自引：0，他引：2
闪锌矿是东升庙多金属硫铁矿床中主要矿石矿物之一,本文从闪锌矿的产状、矿物共生组合、物理性质、化学成分、微量元素含量征、晶胞参数与FeS含量关系等方面探讨了闪锌矿标型特征及其与矿床成因的关系。本区有两类闪锌矿,其中晚期改造作用形成的闪锌矿比原沉积成因的富铁,形成了闪锌矿向铁闪锌矿转化的矿物系列。进一步确定了矿床成因类型为海底喷气热水沉积-弱改造型矿床。进而讨论了不同成矿期闪锌矿的形成条件。 相似文献
12.
作为华南大面积低温成矿域的重要组成部分,川滇黔铅锌矿集区是我国重要的铅锌银等资源基地之一,同时该矿集区也是Ge、Cd、Ga和In等稀散元素的超常富集区域。毛坪矿床是该矿集区内第二大铅锌矿床,累计探明铅锌金属储量超过3Mt(Pb+Zn平均品位≥18%),锗(Ge)保有储量182t。本文以新发现的Ⅵ矿带(铅锌金属已探明储量≥60万t,Pb+Zn平均品位≥20%)为研究对象,利用LA-ICPMS对主要矿石矿物闪锌矿和黄铁矿进行了微区原位微量元素组成和Mapping分析。研究结果显示Ⅵ矿带闪锌矿普遍富集Ge(最高580×10^(-6),均值81.1×10^(-6))、Cd(最高3486×10^(-6),均值1613×10^(-6))和Ga(最高190×10^(-6),均值44.4×10^(-6));黄铁矿普遍富集Mn、As、Pb、Cu、Ag和Sb。与Ⅰ和Ⅱ号矿带闪锌矿相比,Ⅵ号矿带闪锌矿更富集Ge和Ga。闪锌矿中Fe和Pb以类质同象为主,偶见黄铁矿和方铅矿显微包体;Cu、Ge、Ag和As赋存形式主要为类质同象,替代方式为Ge^(4+)+2(Cu+,Ag+,As+)↔3Zn^(2+);Cd以类质同象方式赋存为主,替代机制为Cd^(2+)↔Zn^(2+);Ga和In可能主要以类质同象方式存在。黄铁矿中Pb和Mn主要以方铅矿和碳酸盐矿物显微包体为主;Cu、As和Sb以类质同象形式存在于黄铁矿中;Ag和Zn可能以独立矿物形式赋存;Co和Ni以类质同象方式替代Fe进入黄铁矿晶格中,替代方式为Ni^(2+)+Co^(2+)↔2Fe^(2+)。毛坪矿床新发现Ⅵ矿带硫化物相比典型MVT矿床硫化物具有不同的In和Ge含量以及Cd/Fe比值,结合矿床地质特征和其他证据,表明毛坪矿床成因类型特殊,有别于经典MVT铅锌矿床,属于川滇黔型铅锌矿床。 相似文献
13.
硫化物Rb-Sr同位素定年研究进展 总被引：4，自引：0，他引：4
针对金属矿床成矿年代确定混乱的问题,国内外许多矿床学家和同位素地球化学家对金属矿物常规同位素定年方法进行了有益的探索研究,尤其是对于矿石矿物以闪锌矿、方铅矿和黄铁矿为主的铅锌矿床,硫化物矿物Rb-Sr同位素定年方法显示出了其独特的优势。结合近几年开展的工作,总结国内外硫化物Rb-Sr同位素定年研究取得的成果、闪锌矿中Rb、Sr的赋存状态与定年机理以及定年适应性问题。采用闪锌矿Rb-Sr同位素组成数据拟合成等时线源自热液流体与闪锌矿之间Rb和Sr的不同分异作用,但并不是所有的闪锌矿均适合该定年技术。要成功获得年龄,需结合野外地质特征采集代表性的矿石样品,并在镜下鉴定基础上挑选合适的单矿物;在分析测试过程中,需尽可能去除次生包裹体和粘土矿物。 相似文献
14.
The content of FeS in sphalerites from different parts of a boudinage is compared with the theoretical stress pattern. The calculated differences in stress correspond to less than one mole percent FeS and are often masked by the small variations in the fugacity of sulfur. 相似文献
15.
Microprobe analysis of mineralisations from the district of Hualgayoc, Peru, shows a zonation of sphalerite compositions all around a rhyodacitic body. The differences in the iron content of sphalerites in veins inside the rhyodacite and in sedimentary strata may be explained by a contamination of the hydrothermal solutions by those strata. 相似文献
16.
The compositions of arsenopyrite and sphalerite from five Swedish metamorphosed Cu, Zn-sulfide deposits are related to T and P, according to the methods described by Kretschmar and Scott (1976) and Scott (1973). The As/S ratio of arsenopyrite indicates an equilibrium temperature around 400°C for all the deposits studied, whereas the sphalerite barometer shows pressures between 5 and 7 kb. The mineral assemblages of the bedrocks indicate a similar temperature but a lower pressure. A constant fs2 is probably only effective over distances of millimetres or a few centimetres in the samples studied. The fs2 has always been lower in the surrounding rocks than in the ores as indicated by a higher As/S in arsenopyrite, more FeS in sphalerites and the absence of pyrite. 相似文献
17.
Abstract. A detail investigation of ore and gangue minerals was performed on the Doyashiki Kuroko deposits, Hokuroku basin, Japan for the first time. Main ore minerals are sphalerite, galena, pyrite, chalcopyrite, tetrahedrite-tennantite and digen-ite. Small amounts of enargite, wittichenite, electrum, covellite, bornite, marcasite and hematite are also observed. Quartz, barite and gypsum are common gangue minerals. Homogenization temperatures and salinities of fluid inclusions in quartz, sphalerite and barite range from 190 to 240C and 3.0 to 5.5 wt% NaCl equivalent, respectively. The FeS contents of sphalerite and Ag contents of electrum were 0.12 to 0.18 mol %, 39.0 to 39.6 atom %, respectively. The chemical composition of digenite as a primary mineral shows high sulfur contents.
These data indicate that ore fluid responsible for digenite and associated ore minerals was characterized by a range of high sulfur fugacity with a moderate formation temperature. This is concordant with the mineral assemblage of bornite-pyrite and chalcopyrite, which shows high sulfur fugacity conditions. It seems that the mineralization closely associated with acidic volcanism has occurred around 13 Ma of Middle Miocene on the seafloor at the depth of about 1500 m. 相似文献
These data indicate that ore fluid responsible for digenite and associated ore minerals was characterized by a range of high sulfur fugacity with a moderate formation temperature. This is concordant with the mineral assemblage of bornite-pyrite and chalcopyrite, which shows high sulfur fugacity conditions. It seems that the mineralization closely associated with acidic volcanism has occurred around 13 Ma of Middle Miocene on the seafloor at the depth of about 1500 m. 相似文献
18.
19.
凹子岗锌矿床位于上扬子地块东缘,该矿床经历了两个成矿期:沉积成岩期和热液期,形成两种不同岩相学特征的闪锌矿。流体包裹体岩相学研究显示,存在盐水包裹体(W型)、烃类包裹体(G型)和含石盐子矿物多相包裹体(S型)。有机流体活动与成矿存在耦合关系,其中烃类包裹体(G型)赋存于白云石和自形粗粒闪锌矿中,具有黄色荧光效应,激光拉曼测试显示其成分为沥青质、CH_4、C_3H_8和H_2O;此外,沥青与闪锌矿密切共生。显微测温结果显示热液期流体包裹体均一温度集中于160~180℃,盐度集中于8%~14%NaCl_(eqv),部分可达30%NaCl_(eqv)左右。成矿流体除含有机质外,还含有NaCl、KCl、CaCl_2、MgCl_2、H_2O,为多元共存的流体体系,成矿压力为22~84 MPa。 相似文献
20.
The Bleiberg Pb-Zn deposit in the Drau Range is the type locality of Alpine-type carbonate-hosted Pb-Zn deposits. Its origin has been the subject of on-going controversy with two contrasting genetic models proposed: (1) the SEDEX model, with ore forming contemporaneously with sedimentation of the Triassic host rocks at about 220 Ma vs. (2) the epigenetic MVT model, with ores forming after host rock sedimentation at about 200 Ma or later. Both models assume that, on a deposit or even district scale, a fixed paragenetic sequence of ore minerals can be established. The results of our detailed petrographic, chemical and sulfur isotope study of two key ore-samples from two major ore horizons in the Wetterstein Formation at Bleiberg (EHK02 Erzkalk horizon and Blb17 Maxer Bänke horizon) demonstrate that there is no fixed paragenetic sequence of ore minerals. Small-scale non-systematic variations are recorded in textures, sphalerite chemistry and δ34S. In each sample, texturally different sphalerite types (colloform schalenblende, fine- and coarse-grained crystalline sphalerite) co-occur on a millimeter to centimeter scale. These sphalerites represent multiple mineralization stages/pulses since they differ in their trace element inventory and in their δ34S. Nonetheless, there is some correspondence of sphalerite micro-textures, sulfur isotope and chemical composition between the two samples, with microcrystalline colloform schalenblende being Fe-rich, having high Fe/Cd (15 and 9, respectively) and a light sulfur isotope composition (δ34S −26.0 to −16.2‰). Cadmium-rich and Fe-poor sphalerite in both samples has relatively heavier sulfur isotope composition: in sample EHK02 this sphalerite has Fe/Cd of ∼0.5 and δ34S from −6.6 to −4.6‰; in sample Blb17 Fe/Cd is ∼0.1 and δ34S ranges from −15.0 to −1.5‰. Barite, which is restricted to sample EHK02, has δ34S ≈ 17‰. The large variations in δ34S recorded on the mm to cm-scale is consistent with variable contributions of reduced sulfur from two different sulfur reservoirs. The dominant reservoir with δ34S values <−20‰ likely results from local bacteriogenic sulfate reduction (BSR), whereas the second reservoir, with δ34S about −5‰ suggests a hydrothermal source likely linked with thermochemical sulfate reduction (TSR). Based on this small- to micro-scale study, no simple, deposit-wide paragenetic and sulfur isotope evolution with time can be established. In the Erzkalk ore (sample EHK02) an earlier Pb-Zn-Ba stage, characterized by heavy sulfur isotope values, is succeeded by a light δ34S-dominated Zn-Pb-F stage. In contrast, the several mineralization pulses identified in the stratiform Zn-Pb-F Maxer Bänke ore (sample Blb17) define a broad trend to heavier sulfur isotope values with time. The interaction documented in these samples between two sulfur reservoirs is considered a key mechanism of ore formation. 相似文献