Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Silicate and oxide mineral chemistry and textures of the Norilsk-Talnakh Ni-Cu-platinum group element ore-bearing intrusions

Louise Schoneveld, Stephen J. Barnes, Morgan Williams, Margaux Le Vaillant and David Paterson
Silicate and oxide mineral chemistry and textures of the Norilsk-Talnakh Ni-Cu-platinum group element ore-bearing intrusions
Economic Geology and the Bulletin of the Society of Economic Geologists (June 2020) Pre-Issue Publication

Abstract

A large proportion of the disseminated sulfide ores of the Norilsk-Talnakh camp are hosted within olivine-rich, ultramafic cumulate layers called picro-gabbrodolerite units. In this study we quantitatively analyze the chemistry and textures of the silicate and oxide minerals within olivine-bearing cumulates of the Kharaelakh, Norilsk 1, and Talnakh intrusions to determine how these intrusions compare to each other and to establish the liquidus phase assemblage and crystallization sequence and how the liquid component evolved during solidification. Crystal size distributions indicate that much of the olivine and clinopyroxene oikocrysts grew together in situ as the first of the cumulus phases at contrasting growth rates. These large clinopyroxene oikocrysts record a significant drop in Cr in the system by a significant decrease in Cr content of the outer rims compared to the cores. The chadacrysts of olivine and spinel within the clinopyroxene record the chemistry of the first stages of crystallization, while the minerals in the framework of the cumulate show a relative reduction in Cr and enrichment in incompatible elements such as Ti, Zn, Y, and the rare earth elements, indicative of the enrichment through reactions with the trapped liquid during postcumulate growth. Due to the entrapment of the olivine and spinel in rapidly growing clinopyroxene, these minerals record a history of the changing chemistry during cumulate and postcumulate growth, giving us an insight into the changing conditions during the solidification of intrusions.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: Pre-Issue Publication
Title: Silicate and oxide mineral chemistry and textures of the Norilsk-Talnakh Ni-Cu-platinum group element ore-bearing intrusions
Affiliation: CSIRO, Mineral Resources, Kensington, West. Aust., Australia
Published: 20200624
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 68
Accession Number: 2020-051340
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, strat. cols.
N50°00'00" - N80°00'00", W170°00'00" - E60°00'00"
N37°00'00" - N83°00'00", W170°00'00" - E28°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
Close Modal

or Create an Account

Close Modal
Close Modal