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uralian-alaskan-type intrusions

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Journal Article
Published: 01 October 2016
Russ. Geol. Geophys. (2016) 57 (10): 1437–1464.
..., and Salair Ridge, the compositions of PGM and microinclusions in them, and the dominant mineral assemblages testify to several possible primary sources of PGE mineralization: (1) UralianAlaskan-type intrusions; (2) ophiolite associations, including those formed in a subduction zone; (3) ultramafic alkaline...
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Image
Expanded view of the Cr apex region of the Fe 3+ –Cr–Al diagram showing onl...
Published: 01 February 2009
compositions from Alaskan-type intrusions worldwide, including the 90% density maxima for spinel compositions (n = 386) from Barnes & Roeder (2001) [the 50% maximum plots off the diagram to higher Fe 3+ /(Fe 3+ + Cr + Al)] and spinel compositions (n = 1326) from UralianAlaskan-type intrusions
Journal Article
Published: 01 April 2004
The Canadian Mineralogist (2004) 42 (2): 583–599.
... intrusions of UralianAlaskan type. Ninety percent of the PGM grains studied consist of Pt–Fe alloy, typically with a rhodium content in the 1–2 wt.% range. Pt-bearing Os–Ir–Ru alloy occurs in three variants: (1) heterogeneous grains with an exsolution texture, (2) intergrowths of Os–Ir alloy with Pt–Fe...
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Journal Article
Published: 01 April 2004
The Canadian Mineralogist (2004) 42 (2): 499–514.
...”. The appearance of these thiospinel- and konderite-type chalcogenides, which are uncharacteristic of layered intrusions, is related to the anomalously S-poor character of the Kirakkajuppura PGE deposit, which is similar in this respect to the UralianAlaskantype complexes. Abstract Nous décrivons un sulfure...
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Journal Article
Published: 01 March 2016
The Canadian Mineralogist (2016) 54 (2): 375–376.
... of dunite and chromitite forming part of concentrically zoned Uralian-Alaskan-type intrusions; and (3) Ti-V-rich magnetite associated with the gabbroic rocks of the Uralian-Alaskan complexes. In particular, after the historic discovery in 1819 of platinum in alluvial sediments south of the city...
Series: GSA Memoirs
Published: 01 January 1974
DOI: 10.1130/MEM138-p1
... Columbia are associated with volcanic belts in which principal rock types are alkaline augite and hornblende porphyries ranging from ankaramite to augite alkali basalt and hornblende trachybasalt. The Uralian ultramafic. gabbroic, and associated rocks bear strong similarities to those at Duke Island...
Journal Article
Published: 01 December 2011
The Canadian Mineralogist (2011) 49 (6): 1397–1412.
... are present (because of the presence of minor PGE). For instance, the iridium trend is most characteristic of platinum deposits of UralianAlaskan and Aldanian types, related to zonal mafic-ultramafic intrusive bodies in both orogenic (Urals, Colombia and others) and platform (Inagli, Kondyor and others...
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Journal Article
Published: 01 December 2004
Mineralogical Magazine (2004) 68 (6): 871–885.
...-grained PGM from the Darya have a geological setting similar to the Kondyor PGE placer 75 km to the northeast and are probably related to clinopyroxenite-hornblende-magnetite units of Alaskan-/Uralian-type intrusions. * E-mail: Shcheka@email.com 13 09 2004 18 10 2004 ©...
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Journal Article
Published: 01 December 2011
The Canadian Mineralogist (2011) 49 (6): 1345–1348.
... ranges from descriptions of PGM from Ni-Cu massive sulfides to chromitite-associated occurrences and deposits in layered mafic-ultramafic intrusions, UralianAlaskan-type deposits, and deposits in ophiolite settings. Whereas some of these deposits have relatively low grades and tonnages, they may still...
FIGURES
Journal Article
Published: 01 February 2009
The Canadian Mineralogist (2009) 47 (1): 63–80.
... compositions from Alaskan-type intrusions worldwide, including the 90% density maxima for spinel compositions (n = 386) from Barnes & Roeder (2001) [the 50% maximum plots off the diagram to higher Fe 3+ /(Fe 3+ + Cr + Al)] and spinel compositions (n = 1326) from UralianAlaskan-type intrusions...
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Journal Article
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 343–360.
... of these Na–(Os)-rich hydroxy- or oxo-osmate complexes. We suggest that a mineralized zone rich in chromite–magnesiochromite and hosted by an AlaskanUralian-type complex is the likely provenance for grains of Pt–Fe alloy recovered in Florence Creek. Abstract Nous décrivons les résultats d’analyses de...
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Journal Article
Published: 03 November 2020
Mineralogical Magazine (2020) 84 (6): 900–912.
..., whose formation is associated with the weathering of the Kamenushensky UralianAlaskan type massif, Middle Urals, Russian Federation. The deposit is characterised by the dominance of isoferroplatinum, together with significant numbers of inclusions of Os–Ir–Ru alloys and platinum-group element (PGE...
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