Combined study of Au-bearing arsenopyrite of orogenic gold deposits (NE Asia): High resolution 3D X-ray computed tomography, LA-ICP-MS, and EMPA data

IF 8.5 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geoscience frontiers Pub Date : 2024-10-18 DOI:10.1016/j.gsf.2024.101953
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Abstract

The distribution of gold in small acicular arsenopyrite of a pyrite-arsenopyrite association from Suzdal (Eastern Kazakhstan), Olympiada (Yenisei Ridge, Russia) and large pseudorhombic arsenopyrite crystals from Bazovskoe (Yakutia, Russia) orogenic-type deposits were investigated. On orogenic gold deposits in NE Asia, occurring mainly in black shales, two productive stages of ore deposition are distinguished, which correspond to two morphological varieties of arsenopyrite. At the early stage, fine-grained acicular-prismatic arsenopyrite with invisible gold was deposited; at the late stage, tabular arsenopyrite in association with free visible gold was formed. The samples of gold-bearing arsenopyrite were analyzed using Scanning Electron Microscopy, Electron Microprobe Analyses, Atomic Absorption and Laser Ablation Inductively Coupled Plasma Mass Spectrometry in combination with High Resolution 3D X-ray Computed Tomography (HRXCT). HRXCT does not destroy the studied mineral during the investigation. That technique permits to do an estimation of the amount of gold inclusions in minerals or host rocks and draw reasonable conclusions about the gold content of the ores, to study in detail the distribution patterns of metal inclusions (associated with certain minerals, cracks, crystal growth faces, etc.) and to determine the form of the gold. It can be used to understanding of the genesis of productive mineral associations, and to developing optimal technological schemes for gold extraction.

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成因金矿床(亚洲东北部)含金黄砷矿的综合研究:高分辨率三维 X 射线计算机断层扫描、LA-ICP-MS 和 EMPA 数据
研究了苏兹达尔(哈萨克斯坦东部)、奥林匹亚达(俄罗斯叶尼塞山脊)黄铁矿-砷黄铁矿联合体的小针状砷黄铁矿中金的分布情况,以及巴佐夫斯科(俄罗斯雅库特)造山型矿床的大假菱形砷黄铁矿晶体中金的分布情况。东北亚的造山型金矿床主要出现在黑色页岩中,矿石沉积分为两个生产阶段,与两种形态的黄铜矿相对应。在早期阶段,沉积的是含隐形金的细粒针状棱镜状黄砷矿;在晚期阶段,形成了与游离可见金有关的片状黄砷矿。我们使用扫描电子显微镜、电子微探针分析、原子吸收和激光烧蚀电感耦合等离子体质谱法,结合高分辨率三维 X 射线计算机断层扫描(HRXCT)对含金黄铜矿样品进行了分析。在研究过程中,HRXCT 不会破坏所研究的矿物。该技术可以估算矿物或主岩中金包裹体的数量,对矿石中的金含量得出合理的结论,详细研究金属包裹体的分布模式(与某些矿物、裂缝、晶体生长面等有关),并确定金的形态。它可用于了解高产矿物关联的成因,并制定最佳的提金技术方案。
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来源期刊
Geoscience frontiers
Geoscience frontiers Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
17.80
自引率
3.40%
发文量
147
审稿时长
35 days
期刊介绍: Geoscience Frontiers (GSF) is the Journal of China University of Geosciences (Beijing) and Peking University. It publishes peer-reviewed research articles and reviews in interdisciplinary fields of Earth and Planetary Sciences. GSF covers various research areas including petrology and geochemistry, lithospheric architecture and mantle dynamics, global tectonics, economic geology and fuel exploration, geophysics, stratigraphy and paleontology, environmental and engineering geology, astrogeology, and the nexus of resources-energy-emissions-climate under Sustainable Development Goals. The journal aims to bridge innovative, provocative, and challenging concepts and models in these fields, providing insights on correlations and evolution.
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