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Au crystal growth on natural occurring Au-Ag aggregate elucidated by means of precession electron diffraction (PED)
Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Marti i Franquès s/n, Barcelona, Catalunya 08028, Spain.
Centres Científics i Tecnològics, Universitat de Barcelona, Lluís Solé i Sabaris, 1-3, Barcelona; NanoMEGAS, Boulevard Edmond Machtens 79, Brussels B-1080, Belgium .
Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Marti i Franquès s/n, Barcelona, Catalunya 08028, Spain.ORCID iD: 0000-0002-1298-0320
Centres Científics i Tecnològics, Universitat de Barcelona, Lluís Solé i Sabaris, 1-3, Barcelona, Catalunya 08028, Spain.
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2018 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 483, p. 228-235Article in journal (Refereed) Published
Abstract [en]

In the present work, a lamella from an Au—Ag aggregate found in Ni-laterites has been examined using Transmission Electron Microscope to produce a series of Precision Electron Diffraction (PED) patterns. The analysis of the structural data obtained, coupled with Energy Dispersive X-ray microanalysis, made it possible to determine the orientation of twinned native gold growing on the Au—Ag aggregate. The native Au crystal domains are found to have grown at the outermost part of the aggregate whereas the inner core of the aggregate is an Au—Ag alloy (∼4 wt% Ag). The submicron structural study of the natural occurring Au aggregate points to the mobilization and precipitation of gold in laterites and provides insights on Au aggregates development at supergene conditions. This manuscript demonstrates the great potential of electron crystallographic analysis, and in particular, PED to study submicron structural features of micron sized mineral aggregates by using the example of a gold grain found in a Ni-laterite deposits.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 483, p. 228-235
Keywords [en]
Characterization, Defects, Natural crystal growth, Minerals
National Category
Earth and Related Environmental Sciences Geochemistry
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-68068DOI: 10.1016/j.jcrysgro.2017.11.031ISI: 000419025800034Scopus ID: 2-s2.0-85037705164OAI: oai:DiVA.org:ltu-68068DiVA, id: diva2:1193524
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-05-21Bibliographically approved

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