Three-Dimensional and Microstructural Fingerprinting of Gold Nanoparticles at Fluid-Mineral Interfaces

نویسندگان

چکیده

Abstract Recent studies have identified gold nanoparticles in ores a range of deposit types, but little is known about their formation processes. In this contribution, gold-bearing magnetite from the well-documented, world-class Beiya Au deposit, China, was investigated terms microstructure and crystallography at nanoscale. We present first three-dimensional (3D) focused ion beam/scanning electron microscopy (FIB/SEM) tomography distribution nanopores low-Si magnetite. The porous magnetite, which overprints an earlier generation silician formed by coupled dissolution-reprecipitation reaction (CDRR). extrinsic changes thermodynamic conditions (e.g., S content temperature) hydrothermal fluids resulted CDRR disequilibrium Au-Bi melts. crystallized Au-supersaturated originating melts grew two ways depending on intrinsic crystal structure pore textures: (1) heteroepitaxial growth utilizing (111) lattice planes (2) randomly oriented nucleation growth. Therefore, study unravels how factors drove fluid-mineral interfaces.

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ژورنال

عنوان ژورنال: American Mineralogist

سال: 2021

ISSN: ['0003-004X', '1945-3027']

DOI: https://doi.org/10.2138/am-2021-7696