Chromite-platinum mineralization of clinopyroxenite-dunite massif Zheltaya Sopka, North Ural

Кузьмин, Ю А; Паламарчук, Р. С.; Kalugin, V. M.; Козлов, А. В.; Варламов, Д. А.

doi:10.35597/2313-545x-2020-6-4-3

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Tomamaeite in Hokkaido is found only as minute particles in Pt-Fe(Cu) alloys (Fig. 7), and its occurrence is common in many localities (e.g., Orsoev et al, 2001;Grokhovskaya et al, 2005Grokhovskaya et al, , 2009Kozlov et al, 2011;Tolstykh et al, 2015;Grokhovskaya et al, 2019;Kuzmin et al, 2020). Based on these occurrences, tomamaeite is thought to occur by decomposition of Pt-Fe(Cu) alloys such as tulameenite, and its counterpart, the Pt-rich phase, should also occur.…”

Section: Discussionmentioning

confidence: 99%

“…Cu 3 Pt mineral was originally discovered in replacement rims composed of tulameenite on an isoferroplatinum core as a fine inclusion with diameters up to several tens of micrometers (Distler et al, 1986) and was subsequently reported to have similar occurrence in various localities (e.g., Orsoev et al, 2001;Grokhovskaya et al, 2005Grokhovskaya et al, , 2009Kozlov et al, 2011;Tolstykh et al, 2015;Grokhovskaya et al, 2019;Kuzmin et al, 2020). Grigor'eva et al (2018) reported the occurrence of 10 µm intergrowth grains consisting of orcelite, laurite, and Cu 3 Pt mineral in chromitite.…”

Section: Introductionmentioning

confidence: 99%

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Platinum–group minerals in the placer deposit in northwestern Hokkaido, Japan: description of a new mineral, tomamaeite

Nishio–Hamane

SAITO²

2022

Journal of Mineralogical and Petrological Sciences

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Mineralogical investigation of platinum-group minerals (PGM) from the placer deposit in northwestern Hokkaido, Japan, was conducted at six rivers and two coasts covering an area of 70 km north-south and 30 km east-west: the Moshosanbetsu River (M), the Shosanbetsu River (S), the Ainusawa River (A), the Tomamae coast (T), the Obira coast (OC), the Kamikinenbetsusawa River (K), the Obirashibe River (OR), and the Numatapon River (N) from north to south. Details of the major PGM grain and the occurrence of small but diverse PGM inclusions were revealed in this study. Among diverse PGM inclusions, Cu 3 Pt mineral was discovered in PGM placer from the coast of Tomamae town, and it has been approved as a new mineral, tomamaeite, named after the type locality, by the International Mineralogical Association, the Commission on New Minerals, Nomenclature and Classification (IMA-CNMNC). Later, tomamaeite was also discovered in five localities. Tomamaeite occurs in Pt-Fe(Cu) alloys such as tulameenite, ferronickelplatinum, tetraferroplatinum, and hongshiite as an anhedral particle with a size of less than 20 µm. Tomamaeite is an opaque mineral and has metallic luster with a pale mist white color in reflected light. The hardness of tomamaeite has yet to be determined, although it is estimated to be ~3½ from comparison with compositionally related minerals and the calculated density is 12.4 g•cm −3 using the empirical formula and powder X-ray diffraction data. The empirical formula of tomamaeite calculated on the basis of 4 apfu is (Cu 3.01 Fe 0.06 Ni 0.01 ) Σ3.08 (Pt 0.90 Ru 0.01 Rh <0.01 Pd <0.01 Os <0.01 Ir <0.01 ) Σ0.93 , (Cu 2.92 Fe 0.05 Ni 0.04 ) Σ3.01 (Pt 0.97 Pd 0.01 Rh 0.01 ) Σ0.99 , (Cu 2.86 Sb 0.13 Fe 0.03 Ni 0.02 ) Σ3.03 (Pt 0.92 Ir 0.02 Pd 0.01 Os 0.01 ) Σ0.97 , (Cu 2.71 Sb 0.19 Fe 0.02 Ni 0.02 ) Σ2.94 (Pt 1.01 Ir 0.05 ) Σ1.06 , (Cu 2.93 Fe 0.02 ) Σ2.94 (Pt 1.04 Rh 0.01 ) Σ1.06 , and (Cu 2.82 Fe 0.04 Ni 0.04 ) Σ2.90 (Pt 1.07 Ir 0.03 Pd <0.01 ) Σ1.10from the Tomamae coast, the Moshosanbetsu River, the Shosanbetsu River, the Ainusawa River, the Kamikinenbetsusawa River, and the Numatapon River, respectively. Crystal chemistry was investigated using tomamaeite from the Tomamae coast. Tomamaeite is cubic, Pm 3m, with lattice parameters a = 3.683(2) Å and V = 49.97(7) Å 3 (Z = 1) of Cu 3 Au-type structure, in which Pt occupies the position of origin, and Cu occupies the face-centered positions on a face-centered cubic lattice. PGM from northwestern Hokkaido probably have a mostly common origin and are characterized by depleted ultramafic rocks, and tomamaeite is a non-unique mineral that is formed during the universal postmagmatic process with alteration of such ultramafic rocks to serpentine.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Platinum–group minerals in the placer deposit in northwestern Hokkaido, Japan: description of a new mineral, tomamaeite

Nishio–Hamane

SAITO²

2022

Journal of Mineralogical and Petrological Sciences

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“…More recently, grains of RhSbS composition were described by Tolstykh et al (2011) and Northern Urals by Kuzmin et al (2020) from the dunite of the Svetloborsky intrusion in the Urals Platinum Belt and from the clinopyroxenite-dunite Zheltaya Sopka massif.…”

Section: Introductionmentioning

confidence: 99%

Andrieslombaardite, RhSbS, a new platinum-group mineral from the platiniferous Onverwacht Pipe, Republic of South Africa

Cabri

McDonald

Oberthür

et al. 2023

South African Journal of Geology

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A hundred years after the discovery of the Merensky Reef in 1924, it is appropriate to present the new mineral andrieslombaardite in honour of Andries Frederik Lombaard who was instrumental in its discovery. Andrieslombaardite, RhSbS, was ﬁrst described as an unknown mineral from placer deposits associated with the Tulameen Alaskan-Uralian type complex, British Colombia, Canada (Raicevic and Cabri, 1976) but has since been reported from several other deposits including the platiniferous Driekop, Mooihoek, and Onverwacht pipes in the eastern Bushveld Complex, South Africa. The mineral and the name were approved by the Commission on New Minerals Nomenclature and Classiﬁcation (CNMNC) of the International Mineralogical Association (IMA no. 2022-076) based on data in the co-type samples from Onverwacht and a co-type sample from the Yubdo stream, Birbir River, Ethiopia. Andrieslombaardite in the Onverwacht sample is a single 8 x 20 μm grain attached to laurite in a matrix of altered silicate and Fe-oxyhydroxide minerals. In the Yubdo samples, there are many grains of pale brownish gray andrieslombaardite up to 25 x 55 μm in size, included in Pt-Fe alloys, some associated with erlichmanite, and others attached to bornite and chalcopyrite. The reﬂectance values (R%) measured in air and in oil at the COM wavelengths are 48.3 and 33.0 (470 nm), 49.3 and 34.0 (546 nm), 51.0 and 35.9 (589 nm), and 51.8 and 36.7 (650 nm). The colour values x, y, Y, λd, and Pe in air are 0.317, 0.322, 50.3, 580, and 3.2, and in oil are 0.319, 0.324, 35.6, 579, and 4.5. The composition of andrieslombaardite is ideally RhSbS, but it contains variable amounts of Fe, Pt, Pd, and Ir that may substitute for Rh. The mineral is cubic with unit-cell dimensions of a = 6.0278(4) Å, V = 219.01(6) Å3 and Z = 4. It was synthesised at 400 and 550°C using stoichiometric elemental amounts. It is a member of the cobaltite group. The mineralisation of the intrusive dunite pipes was probably introduced at high temperatures, under magmatic conditions. The primary assemblages were to a certain degree overprinted and redistributed by low-temperature hydrothermal ﬂuids. The Pt-Fe alloys from Yubdo containing PGM inclusions such as andrieslombaardite in the Yubdo-Alaskan-type complex were formed at some post-magmatic stage owing to PGE remobilisation during hydrothermal or metamorphic episodes.

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Tomamaeite Cu3Pt in native osmium from river sediments in the Nizhnie Sergi Region, Central Urals

Sharygin

Mikhailov²

2022

Минералогия (Mineralogy)

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The article is devoted to tomamaeite Cu3Pt from inclusions in a native osmium grain from alluvial river sediments in the Nizhnie Sergi region, Sverdlovsk oblast. It is the fourth fnding of this mineral in the Urals. In addition to tomamaeite, native osmium Os0.36Ir0.33Ru0.31 contains the inclusions of digenite (or, possible, roxbyite), millerite, Fe-Ni-Pt alloy, an unidentifed Pd mineral, magnesiohornblendite, and low-Ca pyroxene. In composition, tomamaeite is close to ideal formula Cu3Pt and contains minor amounts of (wt. %) Pd (up to 2.0), Ir (up to 1.7), Ru and Ni (up to 0.6), and Fe (up to 0.2). In addition to native osmium, two grains of native ruthenium Ru0.54Os0.23Ir0.23 and Ru0.40Os0.31Ir0.29 are found in sediments. Our data suggest that PGE minerals in river sediments could be sourced from mafc-ultramafc massifs located in the Nizhnie Sergi area. The formation of tomamaeite and coexisted minerals is related to the process of postmagmatic transformation of the primary PGE mineral assemblage, probably, during serpentinization of ultramafc rocks.

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Chromite-platinum mineralization of clinopyroxenite-dunite massif Zheltaya Sopka, North Ural

Cited by 4 publications

References 20 publications

Platinum–group minerals in the placer deposit in northwestern Hokkaido, Japan: description of a new mineral, tomamaeite

Platinum–group minerals in the placer deposit in northwestern Hokkaido, Japan: description of a new mineral, tomamaeite

Andrieslombaardite, RhSbS, a new platinum-group mineral from the platiniferous Onverwacht Pipe, Republic of South Africa

Tomamaeite Cu3Pt in native osmium from river sediments in the Nizhnie Sergi Region, Central Urals

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