Trace element compositions of galena in an MVT deposit from the Sichuan-Yunnan-Guizhou metallogenic province, SW China: Constraints from LA-ICP-MS spot analysis and elemental mapping
Trace element compositions of galena in an MVT deposit from the Sichuan-Yunnan-Guizhou metallogenic province, SW China: Constraints from LA-ICP-MS spot analysis and elemental mapping
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川滇黔成矿省 MVT 矿床中方铅矿的微量元素组成：LA-ICP-MS 点分析和元素图的约束
DOI：
10.1016/j.oregeorev.2022.105123
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发表时间：
2022-09
影响因子：
3.3
通讯作者：
Ulrich Thomas
中科院分区：
文献类型：
--
作者：
Li Guomeng;Zhao Zhixin;Wei Junhao;Ulrich Thomas
方铅矿微量元素特征和元素在伴生硫化物之间的分配关系受制约程度很低，特别是在密西西比河谷型（MVT）锌铅矿床中。本文报道了四川-云南-贵州（SYG）最大的MVT矿床之一--大梁子锌铅存款矿床中方铅矿不同阶段的激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）斑点分析数据和典型硫化物组合的元素填图结果。方铅矿一般富集Sb和Ag，少量Cd、Cu和As，但亏损Bi。Sb主要以Sb 3 ++ Ag+ Particle 3 Pb 2+的形式进入方铅矿晶格，在高Sb含量水平（>1200 ppm）时，也发生2Sb 3 ++ □（空位）Particle 3 Pb 2+的置换。Cd以直接置换为主，Cu和As以耦合置换为主。在某些情况下，微夹杂物在Sb、As和Cu的结合中也起重要作用。元素分布图显示，Sb、Ag、Tl主要富集在方铅矿中，Cd、Fe、Mn、Cu、As、Ga、Ge主要富集在闪锌矿中。但当砷黝铜矿存在时，砷黝铜矿将成为Sb、Ag、Cu和As的优先宿主相。这种元素分配验证了痕量元素的优先宿主硫化物受内在因素控制（例如，氧化态和离子半径）而不是外部因素（例如，金属源、压力、温度和氧化还原条件）。温度等外部因素对于给定元素的分配可能至关重要（例如，Cd）之间的优先级和从属主机。此外，方铅矿微量元素特征因矿石成因类型而存在显着差异，这似乎暗示方铅矿地球化学在矿石类型判别中的适用性。
Galena trace element signatures and element partitioning between associated sulfides are poorly constrained, especially in Mississippi Valley-type (MVT) Zn-Pb deposits. This study reports laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) spot analysis data of different stages of galena as well as elemental mapping results of typical sulfide assemblages in the Daliangzi Zn-Pb deposit, one of the largest MVT deposits in the Sichuan-Yunnan-Guizhou (SYG) metallogenic province, SW China. The galena is generally enriched in Sb and Ag, with minor Cd, Cu, and As, but depleted in Bi. Antimony was generally incorporated into galena lattice via Sb3++ Ag+↔ 2Pb2+, and the substitution of 2Sb3++ □ (vacancy) ↔ 3Pb2+also occurred at high Sb content level (>1200 ppm). Direct substitution is the main way for Cd incorporation, while Cu and As may exist via coupled substitution. Micro-inclusions also play important roles in the incorporation of Sb, As, and Cu in some cases. The elemental distribution maps show that Sb, Ag, and Tl are dominantly incorporated into galena, while Cd, Fe, Mn, Cu, As, Ga, and Ge are primarily concentrated in sphalerite. However, when present tennantite-tetrahedrite will become the preferential host phase of Sb, Ag, Cu, and As. This elemental partitioning verifies that the preferential host sulfide for trace elements is controlled by intrinsic factors (e.g., oxidation state and ion radius) rather than external factors (e.g., metal sources, pressure, temperature, and redox conditions). External factors, such as temperature, may be vital for the partitioning of a given element (e.g., Cd) between priority and subordinate hosts. Additionally, the galena trace element characteristics are found to vary significantly with the ore genetic types, which appears to imply the applicability of galena geochemistry in the ore type discrimination.
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