Indium-copper-rich sphalerite from the Restauradora vein, Capillitas, Catamarca, Argentina

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2024-01-18 DOI:10.1111/rge.12325
María Florencia Márquez-Zavalía, Anna Vymazalová, Miguel Ángel Galliski, František Laufek, Marek Tuhý, Yasushi Watanabe, Heinz-Jürgen Bernhardt
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Abstract

The Restauradora vein, is one of the 20 veins of Capillitas (27°27′ S, 66°30′ W), an epithermal precious- and base-metal vein deposit belonging to the Farallón Negro Mining District, northwestern Argentina. One of the main minerals of the paragenesis of Restauradora vein is sphalerite, showing a large substitution of Zn by In and Cu with small participation of Cd and Fe; the fluctuating Zn composition ranges from 0.99 to 0.49 apfu, while In and Cu ranges (apfu) are: 0.22–0.27 and 0.21–0.25, respectively. Under the polarizing-light microscope, using reflected light, the optical properties are those of sphalerite, but with decreasing contents of Zn, especially when Zn is ≤0.60 apfu, a new variety differentiates from regular sphalerite and develops ribbons with paler colors, higher reflectance, softer relative hardness and no internal reflections. The main reflectance values of this In-Cu-rich sphalerite are (Rair, λ/nm): 20.55, 470; 19.43, 546; 19.02, 589; and 18.42, 650. The strongest five x-ray powder-diffraction lines of the synthetic analogue [d in Å (I) (hkl)] are: 3.173 (100) (111); 1.943 (54) (202); 1.657 (37) (113); 1.122 (22) (224); 1.261 (19) (133), the space group is F-43m, with a = 5.49692(10) Å, V = 166,100(10) Å3, Z = 4. Electron-microprobe analyses of the In-Cu-rich sphalerite grains (n = 10) give an average composition (wt%) of: S 29.51, Zn 31.03, In 24.89, Cu 13.49, Ga 0.96, Cd 0.54, Fe 0.05; the average (n = 7) chemical composition of the synthetic phase is: S 29.67, Zn 30.32, In 25.94, Cu 13.82. Despite of the differences, and given that Zn is the main cation and that the structure is the same as that of sphalerite, the mineral studied here is considered as the richest In-Cu variety of sphalerite in the world.

Abstract Image

阿根廷卡塔马卡省卡皮利塔斯市雷斯塔拉多拉矿脉的富铟铜闪锌矿
Restauradora矿脉是Capillitas(南纬27°27′,西经66°30′)的20条矿脉之一,属于阿根廷西北部Farallón Negro矿区的热液贵金属和贱金属矿脉。Restauradora 矿脉成因的主要矿物之一是闪锌矿,其中大量的锌被铟和铜所取代,镉和铁的参与程度较小;锌成分的波动范围为 0.99 至 0.49 apfu,而铟和铜的波动范围(apfu)分别为 0.22-0.27 和 0.25:分别为 0.22-0.27 和 0.21-0.25。在偏光显微镜下,利用反射光观察,其光学性质与闪锌矿相同,但随着锌含量的降低,特别是当锌含量≤0.60 apfu 时,一种新品种从普通闪锌矿中分化出来,并形成颜色较浅、反射率较高、相对硬度较软、无内部反射的条带。这种富含铟-铜的闪锌矿的主要反射率值为(Rair,λ/nm):20.55,470;19.43,546;19.02,589;和 18.42,650。合成类似物最强的五条 X 射线粉末衍射线[d 单位为 Å (I) (hkl)]分别为空间群为 F-43m,a = 5.49692(10) Å,V = 166,100(10) Å3,Z = 4。对富含铟-铜的闪锌矿晶粒(n = 10)进行的电子探针分析表明,其平均成分(重量百分比)为S 29.51,Zn 31.03,In 24.89,Cu 13.49,Ga 0.96,Cd 0.54,Fe 0.05;合成相的平均化学成分(n = 7)为:S 29.67,Zn 30.00,In 24.89,Cu 13.49,Ga 0.96,Cd 0.54,Fe 0.05:S 29.67,Zn 30.32,In 25.94,Cu 13.82。尽管存在差异,但鉴于锌是主要阳离子,且结构与闪锌矿相同,本文研究的矿物被认为是世界上闪锌矿中铟、铜含量最丰富的品种。
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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