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Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu–Au mineralization in the Gangdese belt, Tibet 冈底斯幼生下地壳生成过程中还原岩浆中的硫化物饱和:对西藏冈底斯带斑岩型铜金矿化的影响
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-24 DOI: 10.1007/s00126-024-01269-0
Jin-Lei Sun, Zhong-Jie Bai, Hong Zhong, Xu Liu, Jing-Jing Zhu, Lan Chen, Wei-Guang Zhu

The S saturation and oxidation states of arc magmas are important factors in the formation of porphyry Cu–Au deposits. The Milin juvenile lower crustal cumulates (86.7–84.3 Ma) in the Gangdese provide insights into how sulfide saturation and oxidation states control porphyry mineralization. Zircons from the cumulates have low Ce4+/Ce3+ ratios (21–90) and reduced oxygen fugacities (ΔFMQ–1.8±0.5), which cannot be explained by fractional crystallization or crustal contamination, suggesting inheritance from a mantle source. Partial melting of the mantle under reduced conditions produced a sulfide-saturated primary arc magma with low chalcophile element contents owing to the residual sulfide in the mantle. The Milin lower crustal cumulates contain sulfides, indicating that the magma reached sulfide saturation in the early stages of magmatic differentiation. Based on our model, the primary arc magma before sulfide saturation contained 66.7 ppm Cu and 1.0 ppb Au. The residual magma after sulfide saturation in the lower crust contained 33–66 ppm Cu, 0.13–0.93 ppb Au; i.e., lower contents than those in arc basalts worldwide. Both these factors hindered the formation of Late Cretaceous large porphyry Cu–Au deposits in the Gangdese belt. Remelting of the Milin sulfide-rich cumulates can generate a Cu-rich andesitic magma only under high temperature and high-fO2 conditions, and a melt with low Cu content under low temperature even high-fO2 conditions. Thus, the temperature plays a crucial role in the remelting of the lower crust whether provide enough metals to match the Gangdese Miocene post-collisional porphyry Cu deposit.

弧岩浆的硫饱和度和氧化态是斑岩型铜金矿床形成的重要因素。冈底斯地区的米林幼生下地壳积块(86.7-84.3 Ma)为硫化物饱和度和氧化态如何控制斑岩成矿提供了启示。积块中的锆石具有较低的Ce4+/Ce3+比值(21-90)和较低的氧富集度(ΔFMQ-1.8±0.5),这无法用碎屑结晶或地壳污染来解释,表明其继承自地幔源。地幔在还原条件下的部分熔融产生了硫化物饱和的原生弧岩浆,由于地幔中残留的硫化物,其亲铝元素含量较低。米林下地壳积聚物中含有硫化物,表明岩浆在岩浆分异的早期阶段就达到了硫化物饱和。根据我们的模型,硫化物饱和前的原生弧岩浆含有百万分之 66.7 的铜和百万分之 1.0 的金。硫化物饱和后的残余岩浆在下地壳中的含量为百万分之33-66铜和百万分之0.13-0.93金;即低于全球弧玄武岩中的含量。这两个因素阻碍了晚白垩世大型斑岩型铜金矿床在冈底斯带的形成。米林富硫化物堆积物的重熔只有在高温和高二氧化硫条件下才能生成富含铜的安山岩岩浆,而在低温甚至高二氧化硫条件下才能生成低铜含量的熔体。因此,下地壳重熔能否提供足够的金属来匹配冈底斯中新世碰撞后斑岩型铜矿床,温度起着至关重要的作用。
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引用次数: 0
The In-Ga-Sb association of the post-Variscan Zn-Pb-Ag vein deposit at Lautenthal, Upper Harz Mountains, Germany: sphalerite mineral chemistry 德国上哈尔茨山脉劳滕塔尔后瓦利斯纪锌-铅-银矿脉的铟-镓-锑关联:闪锌矿矿物化学
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-13 DOI: 10.1007/s00126-024-01261-8
Torsten Graupner, Sören Henning, Simon Goldmann, Sebastian Fuchs, Klaus Stedingk, Wilfried Liessmann, Sven Birkenfeld

The Lautenthal sphalerite-galena vein deposit is part of the world-class Upper Harz Pb-Zn-Ag district in the Harz uplift block of the Paleozoic Variscan fold belt in Germany. Its sphalerite-dominated mineral association was studied using bulk-ore chemistry, electron probe microanalysis, and laser ablation-ICP-mass spectrometry. Gallium and locally In are the main high-tech-relevant trace elements hosted by sphalerite, with up to 150 ppm Ga and up to 380 ppm In in hand-picked sphalerite samples (mean In/Zn, 0.70 × 10−3). Ore concentrates (≤ 50 kg) contain up to 65 ppm Ga and up to 109 ppm In (mean In/Zn, 0.36 × 10−3). Accessory Fe-Co-rich gersdorffite-1 occurs in the earlier quartz-sulfide ore stage and Sb-rich gersdorffite-2 in the later carbonate-sulfide stage. Enrichment patterns of In are either defined by overprinting textures in the Fe-richer sphalerite-1 of the earlier stage, or relate to primary growth zoning in Fe-poor sphalerite-2 of the later stage. Using the sphalerite geothermometer GGIMFis, formation temperatures (median) of sphalerite-1 were estimated at ~ 230 °C for the Lautenthal orebody and at ~ 175 °C for the Bromberg orebody, which may indicate lateral T-zonation for the earlier ore stage. Sphalerite-2 data indicate formation temperatures of ~ 185 °C (median). Copper-bearing brines of the carbonate-sulfide stage with assumed temperatures of ~ 250 °C initiated replacement of In-poor sphalerite-1 by chalcopyrite and remobilization of Zn and trace elements. Indium-rich sphalerite-2 occurs associated with calcite and fine-grained galena. A direct spatial or temporal link of ore formation to a magmatic-hydrothermal system is unlikely, which contrasts to In-rich epithermal and tin-polymetallic vein deposits worldwide.

劳滕塔尔闪锌矿-方铅矿脉矿床是德国古生代瓦里斯坎褶皱带哈尔茨隆起区世界级上哈尔茨铅锌金矿区的一部分。该矿床以闪锌矿为主,采用大块孔化学、电子探针显微分析和激光烧蚀-ICP-质谱法对其矿物关联进行了研究。镓和铟是闪锌矿中主要的高科技相关微量元素,在手工挑选的闪锌矿样品中,镓含量高达 150 ppm,铟含量高达 380 ppm(平均铟/锌,0.70 × 10-3)。矿石精矿(≤ 50 千克)的镓含量高达百万分之 65,铟含量高达百万分之 109(In/Zn 平均值为 0.36 × 10-3)。在早期的石英-硫化物矿石阶段出现了富含铁-铜的格氏闪长岩-1,在晚期的碳酸盐-硫化物阶段出现了富含锑的格氏闪长岩-2。铟的富集模式要么是由早期阶段富铁闪锌矿-1中的叠印纹理确定的,要么与后期阶段贫铁闪锌矿-2中的原生生长分带有关。利用闪锌矿地温计 GGIMFis,估计劳滕塔尔矿体闪锌矿-1 的形成温度(中位数)约为 230 °C,布罗姆贝格矿体的形成温度约为 175 °C,这可能表明早期矿石阶段存在横向 T 型分带。闪锌矿-2 的数据表明其形成温度约为 185 °C(中位数)。碳酸盐-硫化物阶段的含铜盐水假定温度约为 250 °C,这促使黄铜矿取代贫铟闪锌矿-1,并使锌和微量元素重新移动。富铟闪锌矿-2 与方解石和细粒方铅矿伴生。矿石形成在空间或时间上与岩浆热液系统直接相关的可能性不大,这与世界各地的富铟表生矿床和锡多金属矿床形成鲜明对比。
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Ultrapotassic plutons as a source of uranium of vein-type U-deposits (Moldanubian Zone, Bohemian Massif): insights from SIMS uraninite U–Pb dating and trace element geochemistry 作为脉型铀矿床铀源的超基性块岩(波希米亚山丘摩尔多瓦区):SIMS铀矿石U-Pb定年和痕量元素地球化学的启示
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-11 DOI: 10.1007/s00126-024-01263-6
Martin Kubeš, Jaromír Leichmann, Vojtěch Wertich, Renata Čopjaková, Markéta Holá, Radek Škoda, Bohdan Kříbek, Julien Mercadier, Michel Cuney, Etienne Deloule, Andreï Lecomte, Ewa Krzemińska

The Bohemian Massif hosts significant hydrothermal U-deposits associated with shear zones in the high-grade metamorphic basement. But there is a lack of evidence of a genetic link between mineralization and U-fertile igneous rocks. This contribution provides constraints on the major U source of the vein-type U-deposits, the timing of ore formation and the metallogenetic model. The anomalous trace element signatures of the low-temperature hydrothermal deposits (high Zr, Y, Nb, Ti, ∑REE) and their close spatial relation with ultrapotassic rocks of the durbachite series point to a HFSE and REE enriched source rock. The durbachites have high U content (13.4–21.5 ppm) mainly stored in magmatic uraninite and other refractory minerals (e.g., thorite, zircon, allanite) that became metamict over a time interval sufficient to release U from their crystal structure, as suggested by the time gap between emplacement of the durbachites (EMP uraninite U–Pb age ~ 338 Ma) and hydrothermal activity (SIMS uranium ore U–Pb age ~ 270 Ma). Airborne radiometric data show highly variable Th/U ratios (1.5–6.0), likely reflecting a combination between (1) crystallization of magmatic uraninite, (2) hydrothermal alteration, and (3) leaching and mobilization of U along NW–SE-trending fault zones, manifested by elevated Th/U values in the radiometric map. The presence of rare magmatic uraninite in durbachites suggests almost complete uraninite dissolution; EMP imaging coupled with LA-ICP-MS analyses of refractory accessory phases revealed extensive mobilization of U together with HFSE and REE, providing direct evidence for metal leaching via fluid-driven alteration of radiation-damaged U-rich minerals. The large-scale HFSE and REE mobilization, demonstrated by the unusual trace element signatures of the U-deposits, was likely caused by low-temperature (270–300 °C), highly alkaline aqueous solutions containing F-, P-, and K-dominated complexing ligands. The first SIMS U–Pb age of 270.8 ± 7.5 Ma obtained so far for U-mineralization from the Bohemian Massif revealed a main Permian U mineralizing event, related to crustal extension, exhumation of the crystalline basement, and basin formation, as recorded by U–Pb apatite dates (280–290 Ma) and AFT thermal history models of the durbachites. The Permo-Carboniferous sedimentary cover probably represented a source of oxidized basinal brines infiltrating the basement-hosted durbachite plutons and triggering massive metal leaching. The interaction between basin-derived brines and durbachites resulted in significant modification of the chemical composition of the hydrothermal system (K and F release during biotite chloritization, P liberation through monazite alteration), leading to the formation of ore-bearing fluids responsible for the metallogenesis of the basement-hosted unconformity-related U-deposits in shear zones in the Bohemian Massif.

波希米亚丘(Bohemian Massif)拥有大量与高品位变质基底剪切带有关的热液铀矿床。但缺乏证据表明矿化与富含铀的火成岩之间存在遗传联系。这篇论文对矿脉型铀矿床的主要铀源、矿石形成的时间和成矿模式提供了约束。低温热液矿床的异常微量元素特征(高Zr、Y、Nb、Ti、∑REE)及其与杜尔拉奇岩系列超生岩的密切空间关系表明,矿床的源岩富含高频闪长岩和REE。杜尔巴赫岩的铀含量很高(13.4-21.5 ppm),主要储存在岩浆铀矿石和其他难熔矿物(如透辉石、锆石、阳起石)中,这些矿物在一定的时间间隔内发生变质,足以从其晶体结构中释放出铀,杜尔巴赫岩的成因(EMP铀矿石U-Pb年龄~338 Ma)与热液活动(SIMS铀矿石U-Pb年龄~270 Ma)之间的时间差也表明了这一点。机载辐射测量数据显示 Th/U 比值变化很大(1.5-6.0),很可能反映了(1)岩浆铀矿的结晶,(2)热液蚀变,以及(3)沿西北-东南走向断层带铀的沥滤和移动,在辐射测量图中表现为 Th/U 值升高。杜拉奇岩中存在稀有的岩浆铀矿石,这表明铀矿石几乎完全溶解;EMP 成像与难熔附属相的 LA-ICP-MS 分析相结合,揭示了铀与高频闪锌矿石和稀土元素的广泛迁移,为通过流体驱动的辐射损伤富含铀矿石的蚀变进行金属沥滤提供了直接证据。铀沉积物不寻常的痕量元素特征表明,大规模的高频闪锌矿和稀土元素移动很可能是由低温(270-300 °C)、高碱性水溶液造成的,其中含有以 F、P 和 K 为主导的络合配体。迄今为止从波希米亚丘获得的第一个 SIMS U-Pb 年龄(270.8 ± 7.5 Ma)揭示了一个主要的二叠纪铀矿化事件,该事件与地壳延伸、结晶基底的掘起和盆地形成有关,U-Pb 磷灰石日期(280-290 Ma)和杜巴赫岩的 AFT 热历史模型记录了这一事件。二叠纪石炭纪沉积覆盖层可能是氧化基底卤水的来源,这些卤水渗入基底托举的杜拉奇岩柱体,引发了大规模的金属沥滤。盆地卤水和杜尔拉奇岩之间的相互作用导致热液系统的化学成分发生重大变化(在生物绿泥石化过程中释放出 K 和 F,通过独居石蚀变释放出 P),从而形成含矿流体,导致波希米亚丘剪切带中基底托管的、与地貌不符的铀矿床的金属生成。
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引用次数: 0
Sodic-calcic alteration and transpressional shear along the Atacama fault system during IOCG mineralization, Copiapó, Chile 智利科皮亚波 IOCG 成矿过程中沿阿塔卡马断层系统的钠钙质蚀变和转位剪切作用
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-09 DOI: 10.1007/s00126-024-01259-2
N. M. Seymour, J. S. Singleton, R. Gomila, G. Arancibia, J. Ridley, M. L. Gevedon, D. F. Stockli, S. M. Seman

The Punta del Cobre district near Copiapó is a center of iron oxide-copper–gold (IOCG) mineralization spatially and temporally associated with regional sodic-calcic hydrothermal alteration, the Atacama fault system (AFS), and two phases of Early Cretaceous magmatism. Here, we investigate the spatiotemporal and geochemical relationships between magmatism, ductile deformation, and hydrothermal alteration along the ~ 200 to 300-m-thick steeply NW-dipping Sierra Chicharra shear zone, interpreted to be the major strand of the AFS. Mylonitic fabrics and oblique sinistral-reverse kinematic indicators together record coaxial flattening in a transpressional regime. Deformation on the AFS took place before, during, and after intrusion of the synkinematic Sierra Chicharra quartz diorite of the Coastal Cordillera arc at ~ 122 Ma and terminated before intrusion of the unstrained ~ 114 Ma Sierra Atacama diorite of the Copiapó batholith. Geochemical data show that the Copiapó batholith was more mafic and more K-rich than the calc-alkaline Coastal Cordillera arc. This time period thus overlaps IOCG mineralization in the Punta del Cobre district (~ 120 to 110 Ma). Multiple phases of sodic-calcic alteration in and around the AFS shear zone are recognized. Textures of altered rock in the shear zone show both synkinematic assemblages and post-kinematic hydrothermal oligoclase. A ~ 775-m-long andradite vein that cuts the shear zone formed broadly at the end of magmatism in the district (~ 95 Ma). Oxygen isotope ratios from the vein indicate that hydrothermal fluids were likely magmatically derived. Together, this work shows the AFS-related shear zone and nearby IOCG mineralization developed in a regional transpressional regime produced by SE-directed oblique convergence across a NE-striking shear zone. IOCG-related magmatic-hydrothermal fluids exploited this transcrustal shear zone to produce multiple episodes of regional sodic-calcic alteration formed from fluids exsolved from magmas or driven by the heat of the Coastal Cordillera arc and Copiapó batholith.

科皮亚波(Copiapó)附近的科布雷角(Punta del Cobre)地区是氧化铁-铜-金(IOCG)矿化中心,在空间和时间上与区域钠钙热液蚀变、阿塔卡马断层系统(Atacama fault system,AFS)以及早白垩世岩浆活动的两个阶段有关。在此,我们研究了岩浆活动、韧性变形和热液蚀变之间的时空和地球化学关系,这些活动沿约 200 至 300 米厚的陡峭西北倾 Sierra Chicharra 剪切带进行,该剪切带被解释为 AFS 的主要地段。麦饭石质构造和斜向正弦反向运动指标共同记录了转压机制下的同轴扁平化。AFS上的变形发生在海岸科迪勒拉弧的Sierra Chicharra石英闪长岩侵入之前、期间和之后(约122 Ma),并在科皮亚波浴岩的Sierra Atacama闪长岩侵入之前(约114 Ma)终止。地球化学数据显示,与钙碱性海岸科迪勒拉弧相比,科皮亚波浴岩的岩浆含量更高,钾含量更丰富。因此,这一时期与 Punta del Cobre 地区的 IOCG 成矿期(约 120 至 110 Ma)重叠。AFS剪切带及其周围的钠钙质蚀变有多个阶段。剪切带中的蚀变岩的纹理显示了同生组合和热液后低凝灰岩。切割剪切带的一条长约 775 米的安山岩脉大致形成于该地区岩浆活动的末期(约 95 Ma)。矿脉中的氧同位素比率表明热液很可能是岩浆流体。总之,这项研究表明,AFS 相关剪切带和附近的 IOCG 矿化是在一个区域性的换位体系中形成的,该换位体系是由穿越东北向切变带的东南向斜向辐合产生的。与 IOCG 相关的岩浆-热液利用这条横贯地壳的剪切带产生了多次区域性钠钙质蚀变,这些蚀变是由岩浆中溶解出来的流体或由海岸科迪勒拉弧和科皮亚波熔岩的热量驱动形成的。
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引用次数: 0
Genesis of Pb–Zn-Ag-Sb mineralization in the Tethys Himalaya, China: Early magmatic-hydrothermal Pb–Zn(-Ag) mineralization overprinted by Sb-rich fluids 中国特提斯喜马拉雅山铅锌银锑矿化成因:富锑流体覆盖的早期岩浆-热液铅锌(-银)成矿作用
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-08 DOI: 10.1007/s00126-024-01264-5
Xiang Sun, Ru-Yue Li, Hao-Yu Sun, Paul H. Olin, M. Santosh, Bin Fu, Jun Deng

Determining the association of Pb–Zn(-Ag) mineralization with granite is crucial for understanding metallogeny and identifying exploration targets. The genesis of Pb–Zn-Ag-Sb deposits and their genetic association with Sb(-Au) deposits and granite-associated Sn-W deposits in the Tethys Himalaya of southern Tibet, China, remains controversial. Our comprehensive study of in situ element compositions and sulfur isotopes of sulfides, together with in situ quartz oxygen isotopes for the Zhaxikang Pb–Zn-Ag-Sb deposit, sheds light on this issue. LA-ICP-MS analyses of early sulfides in manganosiderite veins, coupled with C-O isotopes of manganosiderite, indicate that the early fluids were enriched in Pb, Zn, Ag, Sb, Sn, and Cu, originating from magmatic fluids mixing with meteoric water. The early formed sulfides underwent fluid-mediated remobilization and dissolution, releasing many metallic elements (e.g., Pb, Zn, and Ag) into later As-Sb-rich fluids. These elements reprecipitated as Fe-poor sphalerite, As-rich pyrite, and abundant Sb-Pb sulfosalts with minor Ag-bearing minerals. Oxygen isotopes of quartz indicate that the later fluids were derived from pulsed releases of magmatic fluids mixing with meteoric water. In situ sulfur isotopes of three generations of pyrite indicate that early Pb–Zn(-Ag) sulfide precipitation was linked to magmatic sulfur, whereas precipitation of the later sulfosalts and stibnite involved external sulfur with relatively lower sulfur isotopes compared with early mineralization. We argue that Pb–Zn-Ag-Sb deposits in the Tethys Himalaya resulted from two distinct mineralization pulses. The early Pb–Zn(-Ag) mineralization was associated with crustal magmatic rocks (e.g., leucogranite), followed by the overprinting of later Sb-rich magmatic fluids. Notably, the later magmatic fluids responsible for Zhaxikang Pb–Zn-Ag-Sb mineralization were also associated with the regional Sb(-Au) deposits in the Tethys Himalaya.

确定铅锌(-银)矿化与花岗岩的关联对于了解冶金成因和确定勘探目标至关重要。在中国西藏南部的特提斯喜马拉雅地区,铅锌银锡矿床的成因及其与锡(金)矿床和花岗岩伴生锡-钨矿床的成因关系仍存在争议。我们对扎西康铅锌银矿床硫化物的原位元素组成和硫同位素以及原位石英氧同位素进行了全面研究,揭示了这一问题。锰菱铁矿脉中早期硫化物的 LA-ICP-MS 分析以及锰菱铁矿的 C-O 同位素表明,早期流体富含铅、锌、银、锑、锡和铜,源于岩浆流体与陨石水的混合。早期形成的硫化物经过流体介导的再移动和溶解,释放出许多金属元素(如铅、锌和银),进入后来富含砷-锑的流体中。这些元素以贫铁闪锌矿、富砷黄铁矿和大量含铅铅硫铁矿以及少量含砷矿物的形式重新沉淀。石英的氧同位素表明,后来的流体来自岩浆流体与陨石水混合后的脉冲释放。三代黄铁矿的原位硫同位素表明,早期铅锌(-Ag)硫化物的沉淀与岩浆硫有关,而后期硫铁矿和闪长岩的沉淀则与外部硫有关,与早期成矿作用相比,硫同位素相对较低。我们认为,特提斯喜马拉雅山的铅锌银锑矿床是由两个不同的成矿脉冲形成的。早期的铅锌(-银)矿化与地壳岩浆岩(如白云岩)有关,随后被后期富含锑的岩浆流体覆盖。值得注意的是,造成扎西康铅锌银矿化的后期岩浆流体也与特提斯喜马拉雅地区的区域性铅(金)矿床有关。
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引用次数: 0
Magmatic evolution of the Kolumbo submarine volcano and its implication to seafloor massive sulfide formation 科伦坡海底火山的岩浆演化及其对海底块状硫化物形成的影响
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-05 DOI: 10.1007/s00126-024-01262-7
Simon Hector, Clifford G. C. Patten, Aratz Beranoaguirre, Pierre Lanari, Stephanos Kilias, Paraskevi Nomikou, Alexandre Peillod, Elisabeth Eiche, Jochen Kolb

Seafloor massive sulfides form in various marine hydrothermal settings, particularly within volcanic arcs, where magmatic fluids may contribute to the metal budget of the hydrothermal system. In this study, we focus on the Kolumbo volcano, a submarine volcanic edifice in the central Hellenic Volcanic Arc hosting an active hydrothermal system. Diffuse sulfate-sulfide chimneys form a Zn-Pb massive sulfide mineralization with elevated As, Ag, Au, Hg, Sb, and Tl contents. These elements have similar behavior during magmatic degassing and are common in arc-related hydrothermal systems. Trace-element data of igneous magnetite, combined with whole rock geochemistry and numerical modelling, highlights the behavior of chalcophile and siderophile elements during magmatic differentiation. We report that, despite early magmatic sulfide saturation, chalcophile element contents in the magma do not decrease until water saturation and degassing has occurred. The conservation of chalcophile elements in the magma during magmatic differentiation suggests that most of the magmatic sulfides do not fractionate. By contrast, upon degassing, As, Ag, Au, Cu, Hg, Sb, Sn, Pb, and Zn become depleted in the magma, likely partitioning into the volatile phase, either from the melt or during sulfide oxidation by volatiles. After degassing, the residual chalcophile elements in the melt are incorporated into magnetite. Trace-element data of magnetite enables identifying sulfide saturation during magmatic differentiation and discrimination between pre- and post-degassing magnetite. Our study highlights how magmatic degassing contributes to the metal budget in magmatic-hydrothermal systems that form seafloor massive sulfides and shows that igneous magnetite geochemistry is a powerful tool for tracking metal-mobilizing processes during magmatic differentiation.

海底块状硫化物形成于各种海洋热液环境中,特别是在火山弧内,岩浆流体可能对热液系统的金属预算做出贡献。在这项研究中,我们重点研究了科伦坡火山,这是希腊火山弧中部的一座海底火山大厦,拥有一个活跃的热液系统。弥漫的硫酸盐-硫化物烟囱形成了锌铅块状硫化物矿化,其中砷、银、金、汞、锑和碲含量较高。这些元素在岩浆脱气过程中有类似的表现,在与弧有关的热液系统中很常见。火成岩磁铁矿的痕量元素数据与整岩地球化学和数值建模相结合,凸显了岩浆分异过程中亲鎏金和亲硒元素的行为。我们报告说,尽管岩浆早期硫化物饱和,但岩浆中的亲铝元素含量直到水饱和和脱气发生后才下降。岩浆分异过程中岩浆中亲铝元素的保持表明,大部分岩浆硫化物并没有分馏。与此相反,在脱气过程中,岩浆中的砷、银、金、铜、汞、锑、锡、铅和锌变得贫乏,很可能从熔体中或在挥发物氧化硫化物的过程中分馏到挥发相中。脱气后,熔体中残留的亲铝元素会融入磁铁矿。磁铁矿的痕量元素数据有助于确定岩浆分异过程中硫化物的饱和度,并区分脱气前和脱气后的磁铁矿。我们的研究强调了岩浆脱气如何对形成海底块状硫化物的岩浆-热液系统中的金属预算做出贡献,并表明火成岩磁铁矿地球化学是跟踪岩浆分异过程中金属移动过程的有力工具。
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引用次数: 0
Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France) 利用 Cap Garonne 矿床(法国普罗旺斯)的详细岩相学追踪铜-铅-砷-锌超生矿化的 Eh-pH 演变过程
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-04-01 DOI: 10.1007/s00126-024-01258-3
Poot Julien, Buelens Pierre, Dekoninck Augustin, Rochez Gaëtan, Yans Johan

The supergene zone of the Cap Garonne mineral deposit (Provence, France) hosts one of the most remarkable mineralogy in the world with no less than 150 minerals, 16 of which are type locality. Such mineral diversity offers a detailed view of mineral and geochemical changes during weathering processes. The stratabound epigenetic primary mineralization occurs within a few meters-thick fluvial conglomerates resting above the Permian–Triassic transition and is probably related to Late Triassic–Early Jurassic hydrothermal events. The Cu–As mineralization in the lower part of the conglomerates is locally overlapped by a thin Pb–Zn-rich layer in the northern mine. The results show that the weathered part is significantly enriched in Cu, Pb, As, Zn, Ag, Ba, Sb, and Bi. The evolution of the supergene fluid is traced in an Eh–pH diagram by the succession of sulfides I (tennantite, galena), sulfides II (covellite), arsenates (olivenite), sulfates and sulfo-arsenates (brochantite, anglesite), and carbonates (malachite, azurite, cerussite). The primary sulfide oxidation acidified the host conglomerate and enabled the crystallization of secondary sulfides and arsenates. Efficient and rapid neutralization by the calcite cement of the host conglomerate and chlorite in the matrix caused successive precipitation of arsenates, sulfates, and carbonates. The supergene processes could be related to major periods of weathering in Western Europe (Early Cretaceous–Late Oligocene/Early Miocene). Erosion-prone periods may have contributed to the stripping of the Pb–Zn-rich layer in the southern mine.

Cap Garonne 矿床(法国普罗旺斯)的超基性区拥有世界上最杰出的矿物学之一,其矿物不少于 150 种,其中 16 种属于类型产地。这种矿物多样性提供了风化过程中矿物和地球化学变化的详细情况。地层表生原生矿化发生在二叠纪-三叠纪过渡带上方几米厚的河道砾岩中,可能与晚三叠世-早侏罗世的热液事件有关。砾岩下部的铜锑矿化层与北部矿区的富铅锌薄层局部重叠。结果表明,风化部分明显富含铜、铅、砷、锌、银、钡、锑和铋。在 Eh-pH 图中,通过硫化物 I(天南星石、方铅矿)、硫化物 II(珂罗版石)、砷酸盐(橄榄石)、硫酸盐和硫砷酸盐(brochantite、anggeite)以及碳酸盐(孔雀石、天青石、铈镧矿)的演替,可以追踪超生流体的演化过程。原生硫化物的氧化作用酸化了主砾岩,使次生硫化物和砷酸盐得以结晶。主砾岩的方解石胶结物和基质中的绿泥石的高效快速中和作用导致砷酸盐、硫酸盐和碳酸盐相继沉淀。超新世过程可能与西欧的主要风化时期(早白垩世-晚渐新世/早中新世)有关。易受侵蚀时期可能导致了南部矿区富含铅锌层的剥蚀。
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引用次数: 0
Source of metals in the De’erni ultramafic-hosted volcanic massive sulfide deposit, Eastern Kunlun, China 中国昆仑东部德尔涅超基性岩型火山块状硫化物矿床的金属来源
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-26 DOI: 10.1007/s00126-024-01260-9
Dongmei Tang, Kezhang Qin, Yajing Mao, Noreen J. Evans, Shengchao Xue, Mingjian Cao

The De’erni Cu–Zn-Co deposit is a typical altered ultramafic-hosted volcanogenic massive sulfide deposit comprising four lenticular main orebodies (0.57 Mt Cu, 1.27% Cu average ore grade; 0.03 Mt Co, 0.09% Co average ore grade; 0.16 Mt Zn, 1.04% Zn average ore grade) hosted in serpentinite and a 200-m-thick basalt was found below the No. I orebody. Serpentinite spinel Al2O3, TiO2, Cr#, and Mg# indicate a mantle-source. Serpentinite magmatic-hydrothermal genesis is indicated by the following: (i) high Rb/Y and Th/Zr ratios, low Nb/Zr ratios, and low δ65Cu values; (ii) altered magnetite rims on spinel being characterized by high Cr, Ni, and Ti, and low Ga contents; (iii) pyrite appears along the boundary of spinel grains and has a higher Co and Ni content than pyrite in ores. Therefore, the ultramafic host rocks are formed by strong fluid alteration of primary mantle rocks. The compositional zoning of Co, Cu, and Zn in euhedral coarse-grained pyrite from massive sulfide ore suggests that metal enrichment was associated with three fluid phases, with a clear temporal interval between the fluid activity that introduced Co/Cu enrichment and Zn enrichment (Zn-rich veins in magnetite cross-cut early spinel). Serpentinite exhibits a higher Zn content and decoupling of Ni and Co contents compared to Dur’ngoi ophiolite serpentinite distal from the orebody, implying primary ultramafic rocks may have provided Co to the ores. The apparently high Cu content of the Dur’ngoi ophiolite basalt in comparison with ophiolite basalts worldwide indicates basalt may have supplied the Cu.

De'erni 铜锌钴矿床是一个典型的蚀变超基性火山成因块状硫化物矿床,由四个透镜状主矿体组成(铜 0.57 亿吨,铜平均矿石品位 1.27%;钴 0.03 亿吨,钴平均矿石品位 0.09%;锌 0.16 亿吨,锌平均矿石品位 1.04%),矿体赋存于蛇纹岩中,在 I 号矿体下方发现了 200 米厚的玄武岩。蛇绿岩尖晶石 Al2O3、TiO2、Cr#和 Mg#表明其来源于地幔。蛇绿岩的岩浆-热液成因有以下迹象:(i) Rb/Y 和 Th/Zr 比值高,Nb/Zr 比值低,δ65Cu 值低;(ii) 尖晶石上的蚀变磁铁矿边缘具有 Cr、Ni 和 Ti 含量高而 Ga 含量低的特征;(iii) 黄铁矿出现在尖晶石晶粒的边界,其 Co 和 Ni 含量高于矿石中的黄铁矿。因此,超基性主岩是由原生地幔岩强烈流体蚀变形成的。块状硫化矿中的八面体粗粒黄铁矿中的钴、铜和锌的成分分区表明,金属富集与三个流体阶段有关,引入钴/铜富集的流体活动与锌富集(磁铁矿中的富锌脉交叉切割早期尖晶石)之间存在明显的时间间隔。与距矿体较远的 Dur'ngoi 蛇绿岩相比,蛇绿岩的锌含量较高,镍和钴的含量脱钩,这意味着原生超基性岩可能为矿石提供了钴。与世界各地的蛇绿岩玄武岩相比,Dur'ngoi蛇绿岩玄武岩的铜含量明显偏高,这表明玄武岩可能提供了铜。
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引用次数: 0
Geology and geochronology of the Banchang distal Cu-Mo skarn deposit, Central China 华中板仓远端铜钼矽卡岩矿床的地质和地球同步学
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-22 DOI: 10.1007/s00126-024-01256-5
Zhaoyi Li, Guiqing Xie, Shengli Li, Yuan Wei

Banchang is the largest Cu-Mo deposit (348 Mt @ 0.32% Cu and 428 Mt @ 0.07% Mo) in the Qinling orogenic belt, Central China. Orebodies are hosted in the contact between several granitoid dikes and graphite-bearing marble of the Neoproterozoic Yanlinggou Formation. Wallrock alteration comprises garnet skarn, pyroxene skarn, chlorite skarn, and stockwork chlorite-altered marble. Three hydrothermal stages are indicated: (I) prograde skarn stage, (II) retrograde skarn stage, and (III) main sulfides stage. New zircon U-Pb data show two magmatic events, including early Paleozoic granite porphyry (442 − 427 Ma), and late Mesozoic biotite monzogranite porphyry and late Mesozoic granite porphyry (147 − 146 Ma). The zircon trace element compositions show that the late Mesozoic granitoids with ∆FMQ = -0.7 to 2.3 (avg. 0.5; EuN/EuN* > 0.6) resemble the Cu ore-related granitoid in the Qinling orogenic belt and indicate high oxygen fugacity and water contents in the magma. The early Paleozoic granitoids have ∆FMQ= -2.4 to 0.6 (avg. -0.7; EuN/EuN* < 0.2). Electron Probe Microanalysis (EPMA) on the prograde garnet and pyroxene reveal predominantly andradite (And40 − 94Gro0−51) and diopside (Di53 − 98Hd10−55) compositions, respectively. The garnet Fe3+ contents decreases whereas the pyroxene Fe2+ contents increases from the late Mesozoic granitoid dikes to the marble. This suggests a gradual evolution of the skarn from an oxidized to a reduced state. Stage III sulfide minerals have δ34S = -2.1 to 4.8‰, indicating a magmatic origin. The temporal-spatial relationships, magmatic oxygen fugacity and water contents, zoning of prograde skarn minerals, and the source of sulfur indicate a genetic link between the skarn mineralization and late Mesozoic granitoid dikes. This study proposes a distal Cu-Mo skarn ore deposit model associated with granitoid dikes and some implications for mineral exploration in the Qinling orogenic belt and elsewhere.

板仓是华中秦岭造山带最大的铜钼矿床(铜品位为 3.48 亿吨 @ 0.32%,钼品位为 4.28 亿吨 @ 0.07%)。矿体赋存于新近新生代燕岭沟地层的几条花岗岩岩脉与含石墨的大理岩之间的接触带。壁岩蚀变包括石榴石矽卡岩、辉石矽卡岩、绿泥石矽卡岩和绿泥石蚀变大理岩。热液阶段分为三个:(I)顺行矽卡岩阶段;(II)逆行矽卡岩阶段;(III)主硫化物阶段。新的锆石U-Pb数据显示了两个岩浆事件,包括早古生代花岗斑岩(442-427Ma)和晚中生代黑云母斑岩及晚中生代花岗斑岩(147-146Ma)。锆石微量元素组成显示,中生代晚期花岗岩的∆FMQ = -0.7至2.3(平均0.5;EuN/EuN* > 0.6)与秦岭造山带中与铜矿有关的花岗岩相似,表明岩浆中氧富集度和含水量较高。早古生代花岗岩的∆FMQ= -2.4至0.6(平均-0.7;EuN/EuN* <0.2)。对原生石榴石和辉石的电子探针显微分析(EPMA)显示,其成分分别主要为安山岩(And40 - 94Gro0-51)和透辉石(Di53 - 98Hd10-55)。从中生代晚期花岗岩尖晶石到大理岩,石榴石的 Fe3+ 含量降低,而辉石的 Fe2+ 含量增加。这表明矽卡岩从氧化态逐渐演变为还原态。第三阶段硫化物矿物的δ34S=-2.1至4.8‰,表明其来源于岩浆。时空关系、岩浆氧富集度和含水量、原生矽卡岩矿物的分带以及硫的来源都表明,矽卡岩矿化与中生代晚期花岗岩岩脉之间存在遗传联系。本研究提出了与花岗岩尖晶石相关的远端铜钼矽卡岩矿床模式,并对秦岭造山带及其他地区的矿产勘探提出了一些启示。
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引用次数: 0
Sulfur isotopes in Archaean crustal reservoirs constrain the transport and deposition mechanisms of nickel-sulfides in komatiites 太古宙地壳储层中的硫同位素制约了科马蒂岩中镍硫化物的迁移和沉积机制
IF 4.8 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-16 DOI: 10.1007/s00126-024-01253-8
Anne B. Virnes, Marco L. Fiorentini, Stefano Caruso, Kim Baublys, Quentin Masurel, Nicolas Thebaud

Assimilation and prolonged suspension of crust-derived sulfide liquid in komatiites are essential to form Ni-rich mineralisation. Evaluating the spatial relationship between komatiite-hosted Ni mineralisation and crustal S sources may thus provide insights into mechanisms of transport, metal enrichment and deposition of assimilated sulfide liquid. This study applied facies analysis and S isotopes to sulfides in Ni-mineralised komatiites and stratigraphically underlying bimodal volcanic-volcaniclastic and sedimentary rocks, which formed during rifting in the Agnew-Wiluna Greenstone Belt, Western Australia. The results revealed a lateral variation from rift-distal sedimentary sulfides, through sulfidic BIF, to rift-proximal VMS-style sulfides, the latter of which was predominantly assimilated by komatiites. Both crustal and komatiite-hosted sulfides were overprinted by granite-related skarn alteration during later basin inversion. Spatial S isotopes correlation revealed that Ni mineralisation in komatiites predominantly formed < 5 km from their crustal S sources, excluding long lateral transport as the main metal enrichment mechanism. Rather, metal enrichment likely happened through multiple cycles of sulfide entrapment and entrainment in lava flow vortices that formed in the wake of topographic steps represented by syn-rift faults. These faults were the main loci for pre-existing crustal weaknesses, hydrothermal fluid circulation, and VMS-style sulfide deposition, which were subsequently utilised by komatiites for enhanced thermo-mechanical erosion and crustal sulfide assimilation. This study shows that proximity to the syn-rift faults was the dominant control on the formation of komatiite-hosted Ni–sulfide mineralisation, regardless of substrate lithology. The S isotope signatures of crustal sulfides may be used as a proxy to identify syn-rift faults in highly deformed terranes.

地壳衍生的硫化物液体在孔雀石中的同化和长期悬浮对形成富镍矿化体至关重要。因此,评估孔雀石寄生镍矿化与地壳S源之间的空间关系,有助于深入了解同化硫化液的运移、金属富集和沉积机制。这项研究对西澳大利亚阿格纽-维鲁纳绿岩带断裂期间形成的镍矿化的孔雀石和地层下的双峰火山-火山碎屑岩和沉积岩中的硫化物进行了岩相分析和S同位素研究。研究结果显示了从裂谷远端沉积硫化物到硫化 BIF,再到裂谷近端 VMS 型硫化物的横向变化,后者主要被孔雀石同化。在后来的盆地反转过程中,地壳和孔雀石寄生的硫化物都被花岗岩相关的矽卡岩蚀变所覆盖。空间S同位素相关性显示,镍矿化主要是在距地壳S源5千米的地方形成的,这就排除了横向长距离运移是主要金属富集机制的可能性。相反,金属富集很可能是通过硫化物在熔岩流漩涡中的多次循环夹带而发生的,熔岩流漩涡是在以同步裂谷断层为代表的地形阶梯之后形成的。这些断层是预先存在的地壳薄弱环节、热液循环和 VMS 型硫化物沉积的主要位置,随后被科玛提石利用,加强热机械侵蚀和地壳硫化物同化。这项研究表明,无论基底岩性如何,靠近同步裂谷断层是控制海泡石托举硫化镍矿化形成的主要因素。地壳硫化物的S同位素特征可用作识别高度变形陆相中的同步断裂的替代物。
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Mineralium Deposita
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