Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Oxide-sulfide-melt-bubble interactions in spinel-rich taxitic rocks of the Norilsk-Talnakh Intrusions, polar Siberia

Louise Schoneveld, Stephen J. Barnes, Belinda Godel, Margaux Le Vaillant, Marina A. Yudovskaya, Vadim Kamenetsky and Sergey F. Sluzhenikin
Oxide-sulfide-melt-bubble interactions in spinel-rich taxitic rocks of the Norilsk-Talnakh Intrusions, polar Siberia
Economic Geology and the Bulletin of the Society of Economic Geologists (June 2020) 115 (6): 1305-1320

Abstract

Oxide-rimmed, spherical structures interpreted as former gas bubbles have been discovered within a chromitiferous taxitic lithology of the Norilsk-Talnakh intrusions. These rocks are represented by variable grain size, presence of reworked country-rock xenoliths and millimeter- to centimeter-scale irregular spinel-rich aggregates, patches, or disrupted seams and stringers. They contain spherical and subspherical agglomerations that we interpret as amygdules, partially or completely filled with low-temperature hydrothermal minerals and locally with magmatic phases including sulfide globules. In places these amygdules form clusters that are interpreted as former bubble foams. The wetting relationships visible between vapor bubbles, silicate melt, sulfide liquid, and oxide were investigated in detail using 3-D mu X-ray tomography and detailed 2-D X-ray fluorescence maps. They also reveal short-range spatial variability in silicate and oxide minerals, reflecting small-scale advanced fractionation of silicate melt. Three possible mechanisms are considered for the formation of these bubble-spinel foams: (1) the abundant spinel allows for the in situ nucleation of vapor bubbles, (2) the vapor bubbles ascend through the magma and collect spinel, or (3) the vapor bubbles cause rapid nucleation of chromite within these layers. Although none of these mechanisms can be exclusively ruled out, the texture and chemistry of the Norilsk-Talnakh chromitiferous taxitic lithology is most indicative of in situ nucleation of vapor bubbles on spinel surfaces (i.e., mechanism 1).


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 115
Serial Issue: 6
Title: Oxide-sulfide-melt-bubble interactions in spinel-rich taxitic rocks of the Norilsk-Talnakh Intrusions, polar Siberia
Affiliation: CSIRO, Mineral Resources, Kensington, West. Aust., Australia
Pages: 1305-1320
Published: 20200624
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 54
Accession Number: 2020-051341
Categories: Economic geology, geology of ore depositsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 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"
Secondary Affiliation: Russian Academy of Sciences, Institute of Geology of Ore Deposits, Mineralogy, Petrography, and Geochemistry, RUS, Russian FederationInstitute of Experimental Mineralogy, RUS, Russian Federation
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: 202031
Close Modal

or Create an Account

Close Modal
Close Modal