Gold mobility and nanoparticle growth during pyrite oxidation and iron (oxyhydr)oxides transformation
Description
Data in the manuscript by Feng-Xia Huang et al. to be published by Geochimica et Cosmochimica Acta as "Gold mobility and nanoparticle growth during pyrite oxidation and iron (oxyhydr)oxides transformation".
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Laser Raman spectroscopy was conducted at the China University of Geosciences (Wuhan), using a WITec α300 confocal micro-Raman spectrometer (Germany) equipped with a semiconductor-cooled EMCCD detector. Point analyses were performed with Zeiss 50× or 100× objectives under 532 nm laser excitation at a power of 1–3 mW. Spectra were acquired over the range 0–1400 cm−1 using a 600 gr/mm grating (spectral resolution of 2 cm−1), with each spectrum collected for 20 s and accumulated three times. Cosmic-ray interference and background were removed using WITec Project Five 5.3 software. TEM foils (10 × 10 × 0.1 μm) were prepared using a Helios NanoLab G3 UC FIB–SEM at the Wuhan University of Technology, and a Field Emission (FEI) Scios 2 HiVac FIB–SEM at Huasuan Technology Co., Ltd. Both instruments employed a 69Ga+ liquid-metal ion source for precision milling, operated at 30 kV accelerating voltage, with final polishing step performed at 2 kV to remove the damaged surface layer affected by high-energy Ga. TEM and energy-dispersive X-ray spectroscopy (EDS) analyses were conducted at the same laboratories using an FEI Talos F200S TEM/scanning TEM (STEM) and an FEI Talos F200X G2 TEM, both operated at 200 kV. Trace-element concentrations in pyrite and iron (oxyhydr)oxides were determined by LA–ICP–MS using a New Wave Research 193 nm ArF excimer laser-ablation system coupled to a Thermo Scientific iCAP–RQ ICP–MS at the Guangzhou Tuoyan Analytical Technology Co., Ltd.
Institutions
- China University of GeosciencesHubei, Wuhan