Platinum mineralization in the Alaskan-type intrusive complexes near Fifield, N.S.W., Australia. Part 2. Platinum-group minerals in placer deposits at Fifield

Slansky, Ervin; Barron, L. M.; Suppel, D.; Johan, Zdeněk; Ohnenstetter, M.

doi:10.1007/bf01166889

Cited by 60 publications

(27 citation statements)

References 20 publications

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“…The principal PGM occurring in placers associated with zoned ultramafic massifs are Pt-Fe alloys, followed by Os-Ir-Ru-Pt alloys, although a great variety of other subordinate PGM have been identified lately (e.g., Toma & Murphy 1977, Cabri et al 1981, Rudashevsky 1989, Nixon et al 1990, Cabri & Genkin 1991, Mochalov et al 1991, Slansky et al 1991, Evstigneeva et al 1992, Nekrasov et al 1994, Cabri et al 1996, Tolstykh & Krivenko 1997, Mochalov & Khoroshilova 1998. Protracted confusion over the classification and nomenclature of Pt-Fe alloys was resolved by the suggestions of Cabri & Feather (1975).…”

Section: Introductionmentioning

confidence: 99%

“…However, X-ray powder-diffraction data do not always prove the mineral identity unequivocally because ordering reactions may occur during mechanical treatment of alloys (i.e., preparation of sample for X-ray analysis). Furthermore, Pt-Fe alloy is commonly designated isoferroplatinum both in the western and particularly in the eastern literature, although X-ray data are lacking (e.g., Toma & Murphy 1977, Johan et al 1991, Mochalov et al 1991, Slansky et al 1991, Augé & Legendre 1992, Rudashevsky et al 1992a, b, Nekrasov et al 1994, Palandzhian et al 1994, Tolstykh & Krivenko 1997, Mochalov & Khoroshilova 1998, Augé et al 1998, Ohnenstetter et al 1999. The latter comment applies, in our opinion, to Pt-Fe alloy compositions close to Pt:Fe = 1, which are commonly referred to as tetraferroplatinum.…”

Section: Introductionmentioning

confidence: 99%

“…Over a period of about 180 years, mining operations yielded about 330 tonnes of platinum (Barannikov & Volchenko 1997). These deposits, once the largest PGE deposits in the world, are closely linked to mafic-ultramafic massifs that are located in elongate tectonic belts, developed at convergent plate margins, and termed zoned-type or Alaskan-type massifs (Taylor & Noble 1960, Naldrett & Cabri 1976, Nixon et al 1990, Johan et al 1991, Hattori & Hart 1991, Tistl 1994, Cabri et al 1996 or Uralian-Alaskan-type massifs (Foley et al 1997, Garuti et al 1997 in the western literature. In Russia, however, massifs located within similar tectonic settings are known as of Uralian-type (e.g., Nizhny Tagil, Kytlym, Gal'moenan, etc.…”

Section: Introductionmentioning

confidence: 99%

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Pt Fe NUGGETS DERIVED FROM CLINOPYROXENITE DUNITE MASSIFS, RUSSIA: A STRUCTURAL, COMPOSITIONAL AND OSMIUM-ISOTOPE STUDY

Malitch¹,

Thalhammer²

2002

The Canadian Mineralogist

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Combined structural, compositional and osmium-isotope data on selected Pt-Fe nuggets from economically important placer deposits closely linked to clinopyroxenite-dunite massifs of the Siberian Platform (Kondyor, Inagli, Guli) and the Middle Urals (Nizhny Tagil), Russia, are presented for the first time. Pt-Fe alloys investigated are ferroan platinum (space group Fm3m) with a composition close to Pt 3 Fe. This emphasizes the necessity of an X-ray study in identifying the particular Pt-Fe alloy species. Less common are compositions such as Pt 2 Fe and an intimate intergrowth of Pt 3 Fe 2 and PtFe. Other platinum-group minerals (PGM) observed in ferroan platinum include a diversity of Os-Ir-Ru alloys, PGE sulfides [laurite, malanite, cuproiridsite, cooperite, and an unnamed base metal -(Ir,Pt) monosulfide], PGE sulfarsenides (hollingworthite, irarsite), Pt-Pd tellurides (moncheite, telluropalladinite) and stibiopalladinite. This suite of PGM is consistent with those from other zoned or UralianAlaskan-type massifs. However, unusually Ru-rich alloys included in ferroan platinum of Guli are characteristic of PGM derived from an ophiolite source and underline the transitional signature of the Guli massif between zoned-and ophiolite-type complexes. Pd-rich ferroan platinum nuggets indicate a derivation from clinopyroxenite source-rock, whereas Ir-rich Pt-Fe alloys suggest a chromitite source. The presence of numerous Os-Ir-Ru exsolution lamellae in ferroan platinum are indicative of a hightemperature origin of the PGM. The first Os-isotope data from Os-rich minerals from chromitites and placers closely associated to the Kondyor and Inagli massifs reveal low 187 Os/ 188Os values with a very narrow range, indicative of a common mantle source of the PGE, implying that the PGM are of primary origin. Disintegration of parent ultramafic source-rocks and short-range mechanical transport of liberated PGM formed the placers. Os-isotope model ages in the range of 340 to 355 Ma constrain the formation age of the Kondyor and Inagli massifs of the Aldan Province at the southeastern part of the Siberian Craton, and closely match those from the Guli massif (370 Ma) of the Maimecha-Kotui Province at the northern part of the Siberian Craton.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pt Fe NUGGETS DERIVED FROM CLINOPYROXENITE DUNITE MASSIFS, RUSSIA: A STRUCTURAL, COMPOSITIONAL AND OSMIUM-ISOTOPE STUDY

Malitch¹,

Thalhammer²

2002

The Canadian Mineralogist

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“…Rhodarsenide, as a mineral species, was discovered recently (Tarkian et al 1997) on the Vilyui River in central Siberia, and it was assigned a formula (Rh,Pd) 2 As on the basis of the predominance of Rh over Pd and because of variable proportions of these elements. Before this, rhodarsenide was found as an unnamed phase in Fifield, Australia, as inclusions in isoferroplatinum, and its composition was determined to be Pd 5 Rh 5 As 4 (Johan et al 1991). Inclusions of PdRhAs were also recognized in isoferroplatinum of the Krasnogorsk massif in Koryakia (Dmitrenko et al 1994).…”

Section: Stibiopalladinite Pd 5+x Sb 2-xmentioning

confidence: 99%

“…6. Plot of composition of rhodarsenide, (Rh,Pd) 2 As, from Srebrnica (Tarkian et al 1997) and of PdRhAs from the placer of Pustaya River, Fifield (Johan et al 1991), Koryakiya (Dmitrenko1994), Tuva (Agafonov et al 1998) and Chukotka (Gornostayev 1994 Euhedral crystals of (Pt,Pd) 3 S 2 , of grayish cream color, are no bigger than 10 m and weakly anisotropic. The compositions of two crystals, included in two nuggets, are rather homogeneous (Table 7, Nos.…”

Section: Pt -Pd -Base Metal Sulfidesmentioning

confidence: 99%

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

Tolstykh¹,

Sidorov²,

Laajoki³

et al. 2000

The Canadian Mineralogist

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We have studied the platinum-group minerals (PGM) recovered from the Pustaya River placer deposit, situated within the Koryak-Kamchatka platinum-bearing belt of Alaskan-type intrusions in eastern Russia. The specific features of the geochemistry of the PGM of this placer deposit characterize the ore-forming system in the Alaskan-type source, which was partly eroded. The PGM concentrate (160 grains) consists of platinum nuggets, except for two grains, an iridium nugget and Pd-bearing gold (15.18% Pd). The platinum nuggets are represented by native platinum, isoferroplatinum and Pt-Fe alloy with an elevated concentration of Pd (up to 9.52 wt.%). Some nuggets are surrounded by rims of PtCu, Pt 3 Cu, or PtS composition. Osmium, cooperite, vysotskite, platarsite, hollingworthite, irarsite, sperrylite, keithconnite, stibiopalladinite, rhodarsenide, vasilite, rhodian pyrrhotite and unnamed phases Pd 2 Te, (Pt,Pd) 3 S 2 , (Pt,Pd,Fe,Cu) 3 S, and (Cu,Fe,Pd,Pt,Rh) 9 S 8 occur as inclusions in the platinum nuggets. The oreforming system is characterized by a depletion in Os, Ir, and Ru, and enrichment in Pd and Cu at the late-magmatic stage and Cu at the hydrothermal-metasomatic stage. Enrichment of the melt in Pd produced Pd-rich Pt-Fe alloys. Residual portions of the melt enriched in S, Pd and Cu filled gas vacuoles in platinum nuggets, in which the further crystallization of multi-phase parageneses [vysotskite, vasilite, (Pt,Pd) 3 S 2, (Pt,Pd,Fe,Cu) 3 S, (Cu,Fe,Pd,Pt,Rh,Ru) 9 S 8, bornite and chalcopyrite] occurred. Further hydrothermal-metasomatic transformations led to the appearance of hongshiite and cooperite rims on platinum.

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The mafic–ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan‐type complex

2019

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The Salem Mafic–Ultramafic Complex occurs within the northern part of Cauvery Suture Zone (CSZ), Southern Granulite Terrane (SGT), India. The complex occurs as semicircular to elongated linear body with a thick mantle section and comparatively well‐developed crustal section comprising different lithological units, also referred to as the Chalk Hills of Salem. The major rock types in the complex comprise ultramafic cumulates of dunite, peridotite, wherlite, pyroxenite, and hornblendite, mafic and felsic intrusions of gabbros and amphibolites, and quartzo–feldspathic alkaline rocks together with several ultrapotassic dykes. Geochemical studies of amphibolites from this complex indicate tholeiitic parent magma with enrichment of LIL elements (Rb, Ba, Th, and Sr) and are relatively more enriched than N‐MORB as compared with arc‐related rocks. The enrichment of LIL elements over the HFS elements and with distinct Nb, Ta, and Ti depletion relative to other HFS elements suggest the involvement of subduction‐related components in the depleted mantle source and that the magmatism occurred in an oceanic convergent realm. The mineral chemistry of dunite and peridotite shows high content of forsterite (86.9–92.2) in olivine and high Cr# value (80.85–98.73) for spinel. The tectonic discrimination plots of spinel and olivine mineral chemistry together with clinopyroxene chemistry of amphibolites reveal arc signature typical of Alaskan type of complex. The U–Pb zircon analysis of quartz monzonite intrusion within the hornblendite from the complex yielded a weighted mean age of 819 ± 2.4 Ma, suggesting that the complex formed during the Neoproterozoic and can be correlated to the Alaskan‐type complexes described from the Arabian–Nubian Shield.

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Platinum mineralization in the Alaskan-type intrusive complexes near Fifield, N.S.W., Australia. Part 2. Platinum-group minerals in placer deposits at Fifield

Cited by 60 publications

References 20 publications

Pt Fe NUGGETS DERIVED FROM CLINOPYROXENITE DUNITE MASSIFS, RUSSIA: A STRUCTURAL, COMPOSITIONAL AND OSMIUM-ISOTOPE STUDY

Pt Fe NUGGETS DERIVED FROM CLINOPYROXENITE DUNITE MASSIFS, RUSSIA: A STRUCTURAL, COMPOSITIONAL AND OSMIUM-ISOTOPE STUDY

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

The mafic–ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan‐type complex

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