来自尼永复合体(喀麦隆西南部)刚果克拉通西北边缘阿比埃特-托科金矿区的岩石化学、金和硫化物化学:洞察该地区冲积金矿床的主要来源和成矿情况

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
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引用次数: 0

摘要

阿比埃特-托科金矿区(ATGD)位于刚果克拉通西北边缘的尼永复合体中,是喀麦隆众多生产砂金的矿区之一。尽管许多研究都集中在 ATGD 砂金矿床上,但其主要来源仍不为人知。这项研究结合了通过电感耦合等离子体质谱法(LA-ICP-MS)测定的黄铁矿和黄铜矿的化学成分、通过电子探针显微分析法(EPMA)测定的砂金颗粒的化学成分以及通过电感耦合等离子体原子发射光谱法(ICP-AES)测定的整个岩石成分。这些结果首次证明了岩石中的金,随后对其成因进行了讨论。ATGD 岩石中的金基本上是不可见的,并晶格结合在黄铁矿和黄铜矿中,它们分别含有高达百万分之 3.11 和百万分之 32.6 的金。因此,这里将含金的偏闪长岩(石榴石偏闪长岩)和超基性岩(蛇纹岩化橄榄岩)解释为 ATGD 冲积金矿床和矿点的可能来源。在偏闪长岩中,黄铁矿和黄铜矿出现在石英闪长岩矿脉中,而在超基性岩中,黄铁矿和黄铜矿为散粒,大小为毫米级,形状为卵圆形或立方体。金矿化为剪切赋存,并显示出由循环岩浆和富钴流体(0.01-1.53%)诱发的热液蚀变(硫化)迹象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lithochemistry, and gold and sulphides chemistry from the Abiete-Toko Gold District in the NW edge Congo Craton, Nyong Complex (SW-Cameroon): Insights into the primary source of alluvial gold deposits and occurrence in the area

The Abiete-Toko Gold District (ATGD), in the Nyong Complex, NW edge of the Congo Craton, is one of the numerous Cameroonian mining districts producing alluvial gold. Although numerous works were focused on the ATGD alluvial gold deposits, their primary source(s) remain(s) unknown. This study combines the chemistry of pyrite and chalcopyrite which were determined by inductively coupled plasma-mass spectrometry (LA-ICP-MS), the chemistry of alluvial gold grains determined by electron probe microanalysis (EPMA), and whole rock composition determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The results provide the first evidence of gold in the rocks, and its genesis is subsequently discussed. Gold in the ATGD rocks is essentially invisible and lattice bound in pyrite and chalcopyrite, which intake up to 3.11 ppm and up to 32.6 ppm Au, respectively. The gold-bearing metatexites (garnet migmatite) and ultrabasites (serpentinised peridotites) are here therefore, interpreted as possible sources of the ATGD alluvial gold deposits and occurrences. In metatexite, pyrite and chalcopyrite occur within quartz biotite veins, while in ultrabasites pyrite and chalcopyrite are disseminated grains of millimetric sizes, and ovoid or cubic shapes. Gold mineralisation is shear-hosted and, shows evidence of hydrothermal alteration (sulphidation) induced by circulating magmatic and Co-rich (0.01–1.53 %) fluids.

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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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