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Minerals 2018, 8(9), 380; https://doi.org/10.3390/min8090380

Major and Trace Element Geochemistry of Pyrite and Pyrrhotite from Stratiform and Lamellar Orebodies: Implications for the Ore Genesis of the Dongguashan Copper (Gold) Deposit, Eastern China

1
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China
2
Hunan Key Laboratory of Land and Resources Evaluation and Utilization, Changsha 410007, China
3
Hunan Institute of Geological Survey, Changsha 410116, China
4
School of Resources and safety engineering, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 24 August 2018 / Accepted: 24 August 2018 / Published: 1 September 2018
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Abstract

The Dongguashan copper (gold) deposit in Anhui Province is one of the largest copper (gold) deposits in the Tongling ore district, which is the most important region in the Middle–Lower Yangtze River Metallogenic Belt, Eastern China. Stratiform and lamellar orebodies are the major deposit types. Pyrite and pyrrhotite from the stratiform deposit type (Py I, Po I) and lamellar deposit type (Py II, Po II) are investigated using Electron-probe Microanalyses (EPMA) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). Py I, Py II, Po I and Po II have high contents of Cu, Co, Au and Se, low contents of As, Pb and Zn, with Co/Ni ratios of 0.50−48.00, 4.00−45.00, 1.55−14.45 and 1.02−1.36, respectively, most of which are greater than 1 and vary widely; these characteristics are consistent with those of pyrite with a magmatic–hydrothermal origin. The higher Au/Ag and Fe/(S + As) ratios of pyrite and crystallization temperatures (286–387 °C) of hexagonal pyrrhotite indicate that the mineralization occurrs in environments with medium- to high-temperatures, high sulfur fugacity and medium-shallow depths. Therefore, we suggest that the Dongguashan copper (gold) deposit is a stratabound skarn-type ore deposit associated with magma intrusion activity during the Yanshanian Period. View Full-Text
Keywords: EPMA and LA-ICP-MS; major and trace elements; pyrite and pyrrhotite; Dongguashan copper (gold) deposit; Tongling ore district EPMA and LA-ICP-MS; major and trace elements; pyrite and pyrrhotite; Dongguashan copper (gold) deposit; Tongling ore district
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Liu, Z.; Shao, Y.; Zhou, H.; Liu, N.; Huang, K.; Liu, Q.; Zhang, J.; Wang, C. Major and Trace Element Geochemistry of Pyrite and Pyrrhotite from Stratiform and Lamellar Orebodies: Implications for the Ore Genesis of the Dongguashan Copper (Gold) Deposit, Eastern China. Minerals 2018, 8, 380.

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