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Titolo:
Rare natural polycomponent alloys based on gold and copper from a platinumplacer in the Konder alkaline-ultrabasic massif, southeastern Aldan Shield, Russia
Autore:
Nekrasov, IY; Ivanov, VV; Lennikov, AM; Sapin, VI; Safronov, PP; Oktyabrskii, RA;
Indirizzi:
Russian Acad Sci, Far E Div, Far E Geol Inst, Vladivostok 690022, Russia Russian Acad Sci Vladivostok Russia 690022 t, Vladivostok 690022, Russia
Titolo Testata:
GEOLOGY OF ORE DEPOSITS
fascicolo: 5, volume: 43, anno: 2001,
pagine: 406 - 417
SICI:
1075-7015(200109/10)43:5<406:RNPABO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLID-SOLUTIONS; FAR-EAST; INDICATOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Nekrasov, IY Russian Acad Sci, Far E Div, Far E Geol Inst, Pr Stoletiya Vladivostoka 159, Vladivostok 690022, Russia Russian Acad Sci Pr Stoletiya Vladivostoka 159 Vladivostok Russia 690022
Citazione:
I.Y. Nekrasov et al., "Rare natural polycomponent alloys based on gold and copper from a platinumplacer in the Konder alkaline-ultrabasic massif, southeastern Aldan Shield, Russia", GEOL ORE D, 43(5), 2001, pp. 406-417

Abstract

Gold occurring in the platinum placer of the Konder alkaline-ultrabasic massif is represented by the following varieties: copper gold (6.9-25.0 wt % Cu; single grain with 44.3 wt % Cu)-Au3Cu (cuproauride), AuCu (tetraauricupride), and rare AuCu3 (auricupride); copper-platinum (up to 11.8 wt % Pt)-(Au, Pt)Cu; and copper-palladium (up to 10.3 wt % Pd)-(Au, Pd)Cu; as well assilver alloys (up to 62.7 wt % Ag and 4.8 wt % Cu)-from Au, Au-3(Ag, Cu) to electrum and kustelite. Together with individual grains, gold also forms rims and microinclusions at the margins of cubic crystals of low-impurity high-Fe isoferroplatinum (9.5-11.5 wt % Fe) derived from phlogopite-magnetite clinopyroxenites (Nekrasov et al., 1994). This gold variety was not foundin association with other types of the Konder nuggets genetically related to dunites, i.e., with those (a) of irregular shape with a significant admixture of chromite crystals and (b) rounded with rare chromite inclusions. Tile gold minerals and alloys are accompanied by various minerals of platinum-group elements (PGE), e.g., tetraferroplatinum, tulameenite, Pd-hongshiite, complex sulfides and arsenides of Pd and Pt, as well as antimonides, bismuthides, tellurides, stannides, plumbides, palladium germanide, ctc. According to experimental and geochemical data (Nekrasov et al., 1994; this paper), the Ag-Cu-Ag alloys of the Konder massif were formed at 200-450'C and low f(O2) (10(-15) to 10(-25)) and f(S2) (Up to 10(-25)). According to X-raydiffraction data, the silver gold is disordered and has a face-centered cubic lattice. The copper cold has a tetragonal cell with the degree of ordering decreasing from CuAu to CuAu3 and Au.

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Documento generato il 18/01/21 alle ore 16:30:12