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.
Highlights
As minerals represent the most basic units of rocks and/or ore, their chemical composition and type are of great significance when discussing the origins of rocks and/or ore, as well as the ore genesis and the ore-forming environment [1,2]
Spectrometry (LA-ICP-MS) has realized in situ analysis of single minerals at the nanoscale, which has solved the problem of the large errors in traditional analytical methods
These in situ analytical analytical methods have been widely applied to study on the ore-forming environments, methods have been widely applied to study on the ore-forming environments, ore-forming material ore-forming material source, ore-forming processes, and ore genesis [1,3,4,5,6,7,8,9,10]
Summary
As minerals represent the most basic units of rocks and/or ore, their chemical composition and type are of great significance when discussing the origins of rocks and/or ore, as well as the ore genesis and the ore-forming environment [1,2]. Spectrometry (LA-ICP-MS) has realized in situ analysis of single minerals at the nanoscale, which has Minerals 2018, 8, 380; doi:10.3390/min8090380 www.mdpi.com/journal/minerals. Spectrometry (LA-ICP-MS) has realized in situ analysis of single minerals at the nanoscale, which has solved the problem of the large errors in traditional analytical methods. These in situ solved the problem of the large errors in traditional analytical methods These in situ analytical analytical methods have been widely applied to study on the ore-forming environments, methods have been widely applied to study on the ore-forming environments, ore-forming material ore-forming material source, ore-forming processes, and ore genesis [1,3,4,5,6,7,8,9,10].
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