TY - JOUR

T1 - 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

AU - Naumov, Evgeny

AU - Kalinin, Yuri

AU - Palyanova, Galina

AU - Kryuchkova, Lyudmila

AU - Voitenko, Viacheslav

AU - Abramova, Vera

AU - Pirajno, Franco

PY - 2025/1/1

Y1 - 2025/1/1

N2 - 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 investiga-tion. 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 distribu-tion 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.

AB - 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 investiga-tion. 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 distribu-tion 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.

KW - Рентгеновская компьютерная томография высокого разрешения (HRXCT)

KW - золотосадержаний арсенопирит

KW - Суздальское месторождение (Восточный Казахстан)

KW - месторождение Олимпиада (Енисейский кряж, Россия)

KW - Базовское месторождение (Якутия, Россия)

KW - орогенные золоторудные месторождения

KW - High resolution 3D X-ray Computed Tomograph

KW - Gold-bearing arsenopyrite

KW - Suzdal at East Kazakhstan

KW - Olympiada (Russia)

KW - Bazovskoe (Russia)

KW - Orogenic gold deposits

KW - Computed Tomograph

KW - High resolution 3D X-ray

KW - Olympiada and Bazovskoe (Russia)

UR - https://www.mendeley.com/catalogue/d9c969d1-430b-314e-a91e-e647ac731f6d/

U2 - 10.1016/j.gsf.2024.101953

DO - 10.1016/j.gsf.2024.101953

M3 - Article

VL - 16

JO - Geoscience Frontiers

JF - Geoscience Frontiers

SN - 1674-9871

IS - 1

M1 - 101953

ER -