SEM Study of the Surface of Arsenopyrite and Pyrite from the Natalkinskoe Deposit, Northeastern Russia

— The paper presents newly acquired data on the mineral and chemical composition of the crystal surface layers of arsenopyrite and pyrite from the Natalkinskoe gold deposit, northeastern Russia. Data on arsenopyrite and pyrite grains from metasomatites and from quartz veins and veinlets were obtaine...

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Bibliographic Details
Published in:Geochemistry international 2020-05, Vol.58 (5), p.531-538
Main Authors: Kravtsova, R. G., Tauson, V. L., Goryachev, N. A., Makshakov, A. S., Arsent’ev, K. Yu, Lipko, S. V.
Format: Article
Language:English
Subjects:
Arsenopyrite
Chemical composition
Copper
Crystal surfaces
Crystals
Data acquisition
Earth and Environmental Science
Earth Sciences
Geochemistry
Gold
Mercury
Platinum
Pyrite
Scanning electron microscopy
Silver
Structure
Sulfides
Sulphides
Surface layers
Veins (geology)
X ray spectrometers
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Summary:— The paper presents newly acquired data on the mineral and chemical composition of the crystal surface layers of arsenopyrite and pyrite from the Natalkinskoe gold deposit, northeastern Russia. Data on arsenopyrite and pyrite grains from metasomatites and from quartz veins and veinlets were obtained using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer (SEM-EDX). The surface layers of the sulfide crystals from the metasomatites contain no admixtures, except only As (up to 2.48 wt %) in the pyrite. The surface layers of arsenopyrite crystals from the vein and veinlets contains the following admixtures (wt %): Pt (up to 2.11), U (up to 2.03), Hg (up to 1.11), Au (up to 0.96), and more rarely Ru (up to 1.44), Ir (up to 0.67), Os (up to 0.64), Ag (up to 0.71), and Cu (up to 0.56). The surface layers of the pyrite crystals contain (wt %): As (up to 2.24), Pt (up to 2.88), and Cu (up to 0.69). The detected elevated concentrations of the admixtures are thought to be explained primarily by the presence of nonautonomous phases.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702920050031