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Late-stage sulfide liquid mobility in the main mass of the Sudbury igneous complex; examples from the Victor Deep, McCreedy East, and Trillabelle deposits

James E. Mungall
Late-stage sulfide liquid mobility in the main mass of the Sudbury igneous complex; examples from the Victor Deep, McCreedy East, and Trillabelle deposits (in A special issue devoted to the mineral deposits of the Sudbury Basin, C. M. Lesher (editor) and P. C. Thurston (editor))
Economic Geology and the Bulletin of the Society of Economic Geologists (November 2002) 97 (7): 1563-1576

Abstract

Massive sulphide in the contact sublayer in three different deposits of the Sudbury igneous complex is overlain by substantial thicknesses of norite-hosted disseminated sulphide mineralization with anomalous compositions. In the Trill embayment, the Levack trough (McCreedy East), and the Victor-Nickel Rim embayment (Victor Deep), disseminated sulphides are present at concentrations of 1-5% over a vertical thickness locally exceeding 100 m within the main mass (i.e. texturally homogeneous, inclusion-free) norites above massive contact ores of the sublayer. Where primary textures are preserved, they show that sulphide liquid remained present as an interstitial liquid during the entire crystallization history of the enclosing silicate cumulate rocks. Geochemical modelling of sulphide liquation and fractional crystallization shows that the massive sulphides are cumulates rich in monosulphide solid solution (mss). The overlying disseminated sulphides represent mss left behind by an upward-migrating fractionated sulphide liquid residual to the formation of the massive cumulates at the base. The results show that Cu-rich sulphide liquids are capable of migrating distances greater than 100 m through almost completely solidified cumulate rocks at volume fractions of sulphide as low as 1%. The presence of a halo of disseminated sulphide mineralization, with a distinctly fractionated geochemical character, up to several hundred metres wide above zones of massive sulphide mineralization could be used to detect deeply buried massive sulphide orebodies at Sudbury and elsewhere.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 97
Serial Issue: 7
Title: Late-stage sulfide liquid mobility in the main mass of the Sudbury igneous complex; examples from the Victor Deep, McCreedy East, and Trillabelle deposits
Title: A special issue devoted to the mineral deposits of the Sudbury Basin
Author(s): Mungall, James E.
Author(s): Lesher, C. M.editor
Author(s): Thurston, P. C.editor
Affiliation: University of Toronto, Department of Geology, Toronto, ON, Canada
Affiliation: Laurentian University, Department of Earth Sciences, Sudbury, ON, Canada
Pages: 1563-1576
Published: 200211
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 39
Accession Number: 2003-014846
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200305
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