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Platiniferous Tetra-Auricupride: A Case Study from the Bolshoy Khailyk Placer Deposit, Western Sayans, Russia

Barkov, Andrei Y. and Tamura, Nobumichi and Shvedov, Gennadiy I. and Stan, Camelia V. and Ma, Chi and Winkler, Björn and Martin, Robert F. (2019) Platiniferous Tetra-Auricupride: A Case Study from the Bolshoy Khailyk Placer Deposit, Western Sayans, Russia. Minerals, 9 (3). Art. No. 160. ISSN 2075-163X. http://resolver.caltech.edu/CaltechAUTHORS:20190307-144641609

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Abstract

Tetra-auricupride, ideally AuCu, represents the only species showing the coexistence of Au with an elevated level of Pt, as in the case of a detrital grain studied structurally for the first time, from an ophiolite-associated placer at Bolshoy Khailyk, western Sayans, Russia. We infer that tetra-auricupride can incorporate as much as ~30 mol. % of a “PtCu” component, apparently without significant modification of the unit cell. The unit-cell parameters of platiniferous tetra-auricupride are: a 2.790(1) Å, c 3.641(4) Å, with c/a = 1.305, which are close to those reported for ordered AuCu(I) in the system Au–Cu, and close also to the cell parameters of tetraferroplatinum (PtFe), which both appear to crystallize in the same space group, P4/mmm. These intermetallic compounds and natural alloys are thus isostructural. The closeness of their structures presumably allows Pt to replace Au atoms so readily. The high extent of Cu + Au enrichment is considered to be a reflection of geochemical evolution and buildup in levels of the incompatible Cu and Au with subordinate Pt in a remaining volume of melt at low levels of fO_2 and fS_2 in the system.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3390/min9030160DOIArticle
ORCID:
AuthorORCID
Tamura, Nobumichi0000-0002-3698-2611
Shvedov, Gennadiy I.0000-0001-7339-8468
Stan, Camelia V.0000-0002-5025-5568
Additional Information:© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received: 12 February 2019 / Revised: 28 February 2019 / Accepted: 1 March 2019 / Published: 7 March 2019. (This article belongs to the Special Issue Platinum-Group Minerals: New Results and Advances in PGE Mineralogy in Various Ni-Cu-Cr-PGE Ore Systems) We thank two reviewers and the Editorial board for their comments and suggestions. This research used beamline 12.3.2 at the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. A.Y.B. gratefully acknowledges a partial support of this investigation by the Russian Foundation for Basic Research (project # RFBR 19-05-00181). Author Contributions: Authors wrote the article together. A.Y.B., R.F.M. and B.W. provided the interpretation of data and conclusions of the research, including results of synthesis of AuCu(I)-type compounds (B.W.). N.T., C.V.S. and C.M. contributed results of the micro-Laue and EBSD studies. G.I.S. collected placer samples and completed a field work on the Bolshoy Khailyk placer deposit. There is no conflict of interests.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH11231
Russian Foundation for Basic Research19-05-00181
Subject Keywords:platiniferous tetra-auricupride; Pt-for-Au substitution; platinum; gold; ophiolite; Bolshoy Khailyk placer; western Sayans; Russia
Record Number:CaltechAUTHORS:20190307-144641609
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190307-144641609
Official Citation:Barkov, A.Y.; Tamura, N.; Shvedov, G.I.; Stan, C.V.; Ma, C.; Winkler, B.; Martin, R.F. Platiniferous Tetra-Auricupride: A Case Study from the Bolshoy Khailyk Placer Deposit, Western Sayans, Russia. Minerals 2019, 9, 160.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93640
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:08 Mar 2019 15:32
Last Modified:08 Mar 2019 15:32

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