Russian Mineralogical Society
RMS Annual Session "Ontogeny of minerals applied to scientific and industrial uses (to the 100 year anniversary of Prof. Dmitry Grigoriev)"
Genesis of platinum group minerals of the gabbro–pyroxenite–dunite plutonic complexes in the Koryak Highland

RMS-DPI code:  2009-1-31-0
Scientific session:  1. History, current state and prospects of mineral ontogeny applied to problems of geochemistry, crystallography, mineralogy, lithology, petrology and economic geology.
Author listing:  Mochalov A.G.
Principal author:  Mochalov Alexander Gennadievich
Language:  Russian
Abstract - Summary 
(short description):
The gabbro–pyroxenite–dunite plutonic complexes in the Koryak Highland are typical of a regional palaeoisland arc system, that formed in the Late Cretaceous–Paleocene. The gabbro–pyroxenite–dunite plutonic complexes are allocated platinum (I - Pt), osmic-platinum (I – Pt > Os) and iridiñ-platinum (II – Pt > Ir) mineralogical-geochemical types. Minerals of platinum group of the I - Pt and I – Pt > Os types are magmatic-fluid-metacomatic genesis. Minerals of platinum group II – Pt > Ir type are fluid-metamorfic genesis. II - Pt> Ir, I - Pt and I - Pt> Os types are complicated hydrothermal-metacomatic by association minerals of platinum group (III) connected with process serpentinization the ultrabasic rocks. Formation of chromite schlieres with minerals of platinum group II – Pt > Ir type inclusions probably are result of high-temperature synmagmatic recrystallization of dunites. During this recrystallization processes the ore components (magmatic-chromespinelides and minerals of platinum group of the I - Pt and I – Pt > Os types) were extracted from the dunite plutonic complexes and concentrated in ore minerals of platinum group II – Pt > Ir type and chromite schlieres in the recrystallization-dunites (the texture varies from polygonal equigranular to porphyroclastic with fine-grained matrix).
 
Date of presentation:  06/10/2009
Presentation Place:  Mining University, Hall 1160
 
RMS-DPI code:  2009-1-31-0
Proceeedings volume 
in the RMS catalogue:
 
Ontogeny of minerals applied to scientific and industrial uses (to the 100 year anniversary of Prof. Dmitry Grigoriev)
Pages:  92-94
File of proceedings 
(PDF): 
 337 K
Status:  printed
Accepted:  26/07/2009
Published on-line:  15/10/2009
Permanent address of publication:  http://www.minsoc.ru/2009-1-31-0/
Contact author(s):  Mochalov, Alexander Gennadievich

Copyright © Russian Mineralogical Society, 1995-2011. All rights reserved.
http://www.minsoc.ru
printed on 11/08/2020