Application of EPMA and LA-ICP-MS to Study Mineralogy of Arsenopyrite from the Haoyaoerhudong Gold Deposit, Inner Mongolia, China

YUN Yuanjiao; FAN Chenglong; LYU Xiping; SHI Zhefeng; DOU Zhihui; WANG Yitian; WANG Mengqi; YE Huishou

doi:10.15898/j.cnki.11-2131/td.202111240184

2022 Vol. 41, No. 2

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YUN Yuanjiao, FAN Chenglong, LYU Xiping, SHI Zhefeng, DOU Zhihui, WANG Yitian, WANG Mengqi, YE Huishou. Application of EPMA and LA-ICP-MS to Study Mineralogy of Arsenopyrite from the Haoyaoerhudong Gold Deposit, Inner Mongolia, China[J]. Rock and Mineral Analysis, 2022, 41(2): 211-225. doi: 10.15898/j.cnki.11-2131/td.202111240184

Citation:

YUN Yuanjiao, FAN Chenglong, LYU Xiping, SHI Zhefeng, DOU Zhihui, WANG Yitian, WANG Mengqi, YE Huishou. Application of EPMA and LA-ICP-MS to Study Mineralogy of Arsenopyrite from the Haoyaoerhudong Gold Deposit, Inner Mongolia, China[J]. Rock and Mineral Analysis, 2022, 41(2): 211-225. doi: 10.15898/j.cnki.11-2131/td.202111240184

Application of EPMA and LA-ICP-MS to Study Mineralogy of Arsenopyrite from the Haoyaoerhudong Gold Deposit, Inner Mongolia, China

1.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China
3.
Inner Mongolia Pacific Mining Co., Ltd., Wulatezhongqi 015308, China

More Information

Corresponding author: YE Huishou, yehuishou@163.com

Received Date: 24 November 2021

Revised Date: 19 February 2022

Accepted Date: 11 March 2022

Publish Date: 28 March 2022

Abstract

Abstract

BACKGROUND
The composition of major and trace elements in arsenopyrite can be used to identify the occurrence of elements and explore the remobilization and migration behaviour of elements in different stages. The Haoyaoerhudong gold deposit in Inner Mongolia is a super large gold deposit hosted in the black shales of the Bayan Obo Group. Gold-bearing minerals such as arsenopyrite and loellingite are present. Previous researchers have used the traditional powder dissolution method to analyze the isotope of the ore and discussed the source of ore-forming materials, but the migration and enrichment mechanism of gold has not been unraveled.
OBJECTIVES
To understand the gold migration and enrichment process of this deposit.
METHODS
Based on mineralogy, different types of arsenopyrite were analyzed by electron probe microanalyzer (EPMA) and inductively coupled plasma-mass spectrometry (ICP-MS). The data measured by EPMA was corrected by ZAF program, and the data measured by LA-ICP-MS was quantitatively calculated by "no internal standard-matrix normalized calibration".
RESULTS
The results showed that loellingite was developed in arsenopyrite. They can be divided into Apy-Ⅰ1, Apy-Ⅰ2, Lo-Ⅰ in progressive shear deformation stage and Apy-Ⅱ1, Apy-Ⅱ2 and Lo-Ⅱ in post shear deformation stage. The major element composition of arsenopyrite in different generations was stable, with a small amount of Co and Ni and a trace amount of Sb, Te, Bi, Pb, Au and Ag. Cobalt was higher in Apy-Ⅱ1 and Apy-Ⅱ2, whereas Au, Bi, Pb and Te were obviously enriched in Apy-Ⅰ1. Loellingite was rich in As (64.06%-67.87%), Co (0.33%-4.98%), Ni (1.23%-6.37%). Trace elements such as Au, Te, Bi, Pb and Ag were more enriched in Lo-Ⅱ.
CONCLUSIONS
Lo-Ⅱ is the most important gold-bearing mineral. The changes of temperature and sulfur fugacity lead to the precipitation of loellingite and native gold. Native gold is precipitated by remobilization and migration of "invisible gold" in early arsenopyrite and loellingite.
- gold enrichment mechanism /
- electron probe microanalyzer /
- inductively coupled plasma-mass spectrometry /
- arsenopyrite /
- loellingite /
- trace element /
- Haoyaoerhudong gold deposit

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References

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