Origin of platinum-group mineral assemblages from placers in rivers draining from the ural-alaskan type itchayvayamsky Ultramafics, Far East Russia

Eugene G. Sidorov, Anton V. Kutyrev, Elena S. Zhitova, Valery M. Chubarov, Dmitry A. Khanin

Research outputpeer-review

Abstract

The Itchayvayamsky Ural-Alaskan-type massif is located in the northernmost part of the Koryak-Kamchatka Platinum Belt (Russia) and is surrounded by two rivers (Kamenistaya and Itchayvayam) that both contain specific PGM (platinum group minerals) assemblages. The PGMs of the Kamenistaya River are represented by isoferroplatinum with minor admixtures of Pd and Cu (up to 1.97 and 1.37 wt.%, respectively) and numerous inclusions of other PGMs such as laurite, erlichmanite, and boweite. The Itchayvayam River assemblage is different, as it contains minor amounts of isoferroplatinum and other minerals identical to those of the Kamenistaya River, as well as abundant native platinum rich in Cu and Pd (up to 4.30 and 2.34 wt.%, respectively) and rimmed by secondary cooperite and malanite. Grains of gold intergrown with unnamed Au-Hg-Pd minerals, cooperite, vysotskite, and malanite were also found exclusively in the Itchayvayam River. Three mineral assemblages are spatially related to the Itchayvayam massif and are distinguished by: (1) isoferroplatinum, (2) native platinum, and (3) goldmercury-palladium. Isoferroplatinum assemblages are typical for placers derived from Ural-Alaskan-type massifs and lodes (e.g., the Galmoenan massif in the Koryak Highlands). Simultaneously, the native platinum assemblages are rare and have been described as lodes in clinopyroxenites, and in sub-economic placers derived from clinopyroxenite-dominant massifs. Therefore, it is assumed that the origin of the first assemblage is from lodes in dunite and the second is from lodes in clinopyroxenite. In addition, gold-mercury-palladium assemblages apparently originated from mineralized zones, analogous to those intruding gabbro and monzonite at the nearby Barany massif, which contains native gold and Pd-sulfides. Our study of the structure and compositions of Pt-Fe minerals showed that in the structure of isoferroplatinum Cu and Ni substitute for Fe, whereas in native platinum they substitute for both Pt and Fe.

Original languageEnglish
Pages (from-to)91-104
Number of pages14
JournalCanadian Mineralogist
Volume57
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Scopus subject areas

  • Geochemistry and Petrology

Cite this

@article{024328c632bf4cffbd24db3b39253cb7,
title = "Origin of platinum-group mineral assemblages from placers in rivers draining from the ural-alaskan type itchayvayamsky Ultramafics, Far East Russia",
abstract = "The Itchayvayamsky Ural-Alaskan-type massif is located in the northernmost part of the Koryak-Kamchatka Platinum Belt (Russia) and is surrounded by two rivers (Kamenistaya and Itchayvayam) that both contain specific PGM (platinum group minerals) assemblages. The PGMs of the Kamenistaya River are represented by isoferroplatinum with minor admixtures of Pd and Cu (up to 1.97 and 1.37 wt.{\%}, respectively) and numerous inclusions of other PGMs such as laurite, erlichmanite, and boweite. The Itchayvayam River assemblage is different, as it contains minor amounts of isoferroplatinum and other minerals identical to those of the Kamenistaya River, as well as abundant native platinum rich in Cu and Pd (up to 4.30 and 2.34 wt.{\%}, respectively) and rimmed by secondary cooperite and malanite. Grains of gold intergrown with unnamed Au-Hg-Pd minerals, cooperite, vysotskite, and malanite were also found exclusively in the Itchayvayam River. Three mineral assemblages are spatially related to the Itchayvayam massif and are distinguished by: (1) isoferroplatinum, (2) native platinum, and (3) goldmercury-palladium. Isoferroplatinum assemblages are typical for placers derived from Ural-Alaskan-type massifs and lodes (e.g., the Galmoenan massif in the Koryak Highlands). Simultaneously, the native platinum assemblages are rare and have been described as lodes in clinopyroxenites, and in sub-economic placers derived from clinopyroxenite-dominant massifs. Therefore, it is assumed that the origin of the first assemblage is from lodes in dunite and the second is from lodes in clinopyroxenite. In addition, gold-mercury-palladium assemblages apparently originated from mineralized zones, analogous to those intruding gabbro and monzonite at the nearby Barany massif, which contains native gold and Pd-sulfides. Our study of the structure and compositions of Pt-Fe minerals showed that in the structure of isoferroplatinum Cu and Ni substitute for Fe, whereas in native platinum they substitute for both Pt and Fe.",
keywords = "Dunite, Kamchatka, Koryak, Placer, Platinum Group Minerals, Ultramafic, Ural-Alaskan Type",
author = "Sidorov, {Eugene G.} and Kutyrev, {Anton V.} and Zhitova, {Elena S.} and Chubarov, {Valery M.} and Khanin, {Dmitry A.}",
year = "2019",
month = "1",
day = "1",
doi = "10.3749/canmin.1800040",
language = "English",
volume = "57",
pages = "91--104",
journal = "Canadian Mineralogist",
issn = "0008-4476",
publisher = "Mineralogical Association of Canada",
number = "1",

}

Origin of platinum-group mineral assemblages from placers in rivers draining from the ural-alaskan type itchayvayamsky Ultramafics, Far East Russia. / Sidorov, Eugene G.; Kutyrev, Anton V.; Zhitova, Elena S.; Chubarov, Valery M.; Khanin, Dmitry A.

In: Canadian Mineralogist, Vol. 57, No. 1, 01.01.2019, p. 91-104.

Research outputpeer-review

TY - JOUR

T1 - Origin of platinum-group mineral assemblages from placers in rivers draining from the ural-alaskan type itchayvayamsky Ultramafics, Far East Russia

AU - Sidorov, Eugene G.

AU - Kutyrev, Anton V.

AU - Zhitova, Elena S.

AU - Chubarov, Valery M.

AU - Khanin, Dmitry A.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The Itchayvayamsky Ural-Alaskan-type massif is located in the northernmost part of the Koryak-Kamchatka Platinum Belt (Russia) and is surrounded by two rivers (Kamenistaya and Itchayvayam) that both contain specific PGM (platinum group minerals) assemblages. The PGMs of the Kamenistaya River are represented by isoferroplatinum with minor admixtures of Pd and Cu (up to 1.97 and 1.37 wt.%, respectively) and numerous inclusions of other PGMs such as laurite, erlichmanite, and boweite. The Itchayvayam River assemblage is different, as it contains minor amounts of isoferroplatinum and other minerals identical to those of the Kamenistaya River, as well as abundant native platinum rich in Cu and Pd (up to 4.30 and 2.34 wt.%, respectively) and rimmed by secondary cooperite and malanite. Grains of gold intergrown with unnamed Au-Hg-Pd minerals, cooperite, vysotskite, and malanite were also found exclusively in the Itchayvayam River. Three mineral assemblages are spatially related to the Itchayvayam massif and are distinguished by: (1) isoferroplatinum, (2) native platinum, and (3) goldmercury-palladium. Isoferroplatinum assemblages are typical for placers derived from Ural-Alaskan-type massifs and lodes (e.g., the Galmoenan massif in the Koryak Highlands). Simultaneously, the native platinum assemblages are rare and have been described as lodes in clinopyroxenites, and in sub-economic placers derived from clinopyroxenite-dominant massifs. Therefore, it is assumed that the origin of the first assemblage is from lodes in dunite and the second is from lodes in clinopyroxenite. In addition, gold-mercury-palladium assemblages apparently originated from mineralized zones, analogous to those intruding gabbro and monzonite at the nearby Barany massif, which contains native gold and Pd-sulfides. Our study of the structure and compositions of Pt-Fe minerals showed that in the structure of isoferroplatinum Cu and Ni substitute for Fe, whereas in native platinum they substitute for both Pt and Fe.

AB - The Itchayvayamsky Ural-Alaskan-type massif is located in the northernmost part of the Koryak-Kamchatka Platinum Belt (Russia) and is surrounded by two rivers (Kamenistaya and Itchayvayam) that both contain specific PGM (platinum group minerals) assemblages. The PGMs of the Kamenistaya River are represented by isoferroplatinum with minor admixtures of Pd and Cu (up to 1.97 and 1.37 wt.%, respectively) and numerous inclusions of other PGMs such as laurite, erlichmanite, and boweite. The Itchayvayam River assemblage is different, as it contains minor amounts of isoferroplatinum and other minerals identical to those of the Kamenistaya River, as well as abundant native platinum rich in Cu and Pd (up to 4.30 and 2.34 wt.%, respectively) and rimmed by secondary cooperite and malanite. Grains of gold intergrown with unnamed Au-Hg-Pd minerals, cooperite, vysotskite, and malanite were also found exclusively in the Itchayvayam River. Three mineral assemblages are spatially related to the Itchayvayam massif and are distinguished by: (1) isoferroplatinum, (2) native platinum, and (3) goldmercury-palladium. Isoferroplatinum assemblages are typical for placers derived from Ural-Alaskan-type massifs and lodes (e.g., the Galmoenan massif in the Koryak Highlands). Simultaneously, the native platinum assemblages are rare and have been described as lodes in clinopyroxenites, and in sub-economic placers derived from clinopyroxenite-dominant massifs. Therefore, it is assumed that the origin of the first assemblage is from lodes in dunite and the second is from lodes in clinopyroxenite. In addition, gold-mercury-palladium assemblages apparently originated from mineralized zones, analogous to those intruding gabbro and monzonite at the nearby Barany massif, which contains native gold and Pd-sulfides. Our study of the structure and compositions of Pt-Fe minerals showed that in the structure of isoferroplatinum Cu and Ni substitute for Fe, whereas in native platinum they substitute for both Pt and Fe.

KW - Dunite

KW - Kamchatka

KW - Koryak

KW - Placer

KW - Platinum Group Minerals

KW - Ultramafic

KW - Ural-Alaskan Type

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U2 - 10.3749/canmin.1800040

DO - 10.3749/canmin.1800040

M3 - Article

VL - 57

SP - 91

EP - 104

JO - Canadian Mineralogist

JF - Canadian Mineralogist

SN - 0008-4476

IS - 1

ER -