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  

作　　者：Evgeny Naumov Yuri Kalinin Galina Palyanova Lyudmila Kryuchkova Viacheslav Voitenko Vera Abramova Franco Pirajno 

机构地区：[1]Central Research Institute of Geological Prospecting for Base and Precious Metals,Moscow,Russian Federation [2]Sobolev Institute of Geology and Mineralogy,Siberian Branch of Russian Academy of Sciences,Novosibirsk,Russian Federation [3]St.Petersburg State University,SPbSU,St.Petersburg,Russian Federation [4]Geological Center of SPbSU,St.Petersburg,Russian Federation [5]Institute of Geology of Ore Deposits,Petrography,Mineralogy and Geochemistry,Russian Academy of Sciences,Moscow,Russian Federation [6]University of Western Australia,Centre of Exploration Targeting,Australia

出　　处：《Geoscience Frontiers》2025年第1期91-105,共15页地学前缘(英文版)

基　　金：financial support for the project by the Russian Federation represented by the Ministry of Education and Science of Russia(project number 13.1902.24.44,agreement number 075-15-2024-641).

摘　　要：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.

关 键 词：High resolution 3D X-ray Computed tomograph Gold-bearing arsenopyrite Suzdal at East Kazakhstan Olympiada and Bazovskoe(Russia) Orogenic gold deposits 

分 类 号：TF1[冶金工程—冶金物理化学]