Controls on the Formation of Contact-Type Platinum-Group Element Mineralization in the East Bull Lake Intrusion

Peck, D. C.; Keays, Reid R.; James, R. S.; Chubb, P. T.; Reeves, Shane

doi:10.2113/gsecongeo.96.3.559

Cited by 35 publications

(26 citation statements)

References 40 publications

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“…7D) which Peck et al (2001) explained by a high R-factor (~6600). However, greenschist to amphibolite facies metamorphism has strongly modified the primary mineralogy of mafic igneous rocks (Card, 1978;Chubb, 1994;Peck et al, 2001) and the textures of preexisting magmatic sulfides. The structurally controlled PGE-rich sulfides in the Parisien Lake Deformation Zone are the best example of this recrystallization.…”

Section: Hydrothermal Alterationmentioning

confidence: 99%

“…7D) and point to a non-magmatic origin. Peck et al (2001) indicate that these sulfides were formed by the circulation of metamorphic fluids that provoke the dissolution of pre-existing PGE-rich disseminated sulfides and their recrystallization in shear zones cutting the intrusion with the formation of low temperature Pd-Bi-Te minerals. In addition, it is quite possible that the circulation of metamorphic fluids has remobilized the S from the contact-type PGE mineralization and subsequently reprecipitates PGE and Se-poor sulfide in the permeable shear zone.…”

Section: Hydrothermal Alterationmentioning

confidence: 99%

“…The sulfide assemblage consists of bornite and chalcopyrite, and the Cu/Ni is high (≤ 40). The O'Kiep deposit was metamorphosed at 750-820°C and 5-6 kbar (Raith and Harley, 1998) and the Curaçà Valley deposits reached granulite facies (Maier and Godel and Barnes (2008) and Peck et al (2001). .…”

Section: Metamorphismmentioning

confidence: 99%

“…The S/Se ratio is commonly used to monitor the effect of weathering (e.g., Peck et al, 2001;Ripley et al, 2002;Lorand et al, 2003) and to provide help in determining if the S content of the rock is representative of its initial composition. For example, in country rocks outcropping at the Voisey's Bay deposit, the weathering remobilized the S, leading to Fig.…”

Section: Low Temperature Alterationmentioning

confidence: 99%

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A review of sulfur to selenium ratios in magmatic nickel–copper and platinum-group element deposits

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Section: Hydrothermal Alterationmentioning

confidence: 99%

Section: Hydrothermal Alterationmentioning

confidence: 99%

Section: Metamorphismmentioning

confidence: 99%

Section: Low Temperature Alterationmentioning

confidence: 99%

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A review of sulfur to selenium ratios in magmatic nickel–copper and platinum-group element deposits

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“…The minerals industry has acknowledged that this activity was prompted by research published by Peck et al (1993Peck et al ( , 1995. Despite this interest, there is no single paper that summarizes the geology, stratigraphy, petrology, and mineralization of all the intrusions that comprise the suite.…”

Section: Introductionmentioning

confidence: 99%

The East Bull Lake Intrusive Suite: Remnants of a 2.48 GaLarge Igneous and Metallogenic Province in the Sudbury Area of the CanadianShield

et al. 2002

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The 2.49 to 2.475 Ga intrusions of the East Bull Lake intrusive suite occur in an east-northeast-trending discontinuous belt along the presently exposed boundary between the Archean Superior and the Proterozoic Southern provinces of the Canadian Shield near Sudbury, Ontario. The East Bull Lake intrusive suite is part of a regional Paleoproterozoic magmatic event, extending from 2.49 to 2.44 Ga, which also includes bimodal volcanic rocks, felsic plutons, and the regionally extensive Hearst and Matachewan dike swarms. This regional magmatic event is thought to be the result of a mantle plume-driven, intracontinental rifting event that led to the development of a major basin to the south that was subsequently filled by sedimentary rocks of the Huronian Supergroup. The East Bull Lake intrusive suite appears to have been emplaced along a major axial-rift fault related to this rifting event.Compelling field and geochemical evidence summarized here indicates that the three largest East Bull Lake suite intrusions, the East Bull Lake, Agnew Lake, and River Valley intrusions, crystallized from similar, low Ti, high Al tholeiitic parent magmas that originated in deeper, more basic chambers. It is proposed that the primary magmas for the East Bull Lake suite intrusions were second-stage melts derived from a sublithospheric depleted mantle source that had been modified by Neoarchean subduction and accretion events.Most of the petrological characteristics of the East Bull Lake suite intrusions reflect plagioclase-dominated fractional crystallization that generated a pronounced Fe enrichment trend in the residual magmas. Orthopyroxene is the high-temperature pyroxene and occurs as a cumulus phase through most of the stratigraphy of each intrusion of the suite. Local olivine-rich cumulates, present in all of the major East Bull Lake suite plutons, in some instances appear to be comagmatic with associated plagioclase-rich cumulates. A distinctive marginal facies, comprising brecciated and locally thermally recrystallized and/or partially melted footwall rocks, is a common feature of the East Bull Lake suite plutons and indicates that a high-energy flow regime existed during the initial stages of emplacement. This marginal unit typically grades into a heterolithic, inclusion-rich gabbronorite that contains erratically distributed mafic autoliths and footwall-derived xenoliths. Chemical contamination of the mineralized matrix of these inclusion-bearing rocks can be extreme at a local scale. The inclusion-rich zone is overlain by a thick interval of undifferentiated, plagioclase-rich cumulates that locally display spectacular glomerocrystic textures. Rhythmically and irregularly, modally layered leucogabbronorite and gabbronorite make up much of the middle parts of the stratigraphy. Massive to crudely layered ferrogabbro and ferrosyenite only occur in the uppermost part of the Agnew Lake intrusion. Varitextured gabbro and pegmatitic gabbro occur as irregular layers and local veins and pods throughout the stratigraphy.The East Bull L...

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Magmatic mineralization and hydrothermal enrichment of the High Grade Zone at the Lac des Iles palladium mine, northern Ontario, Canada

Hinchey

Hattori

2005

Miner Deposita

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Controls on the Formation of Contact-Type Platinum-Group Element Mineralization in the East Bull Lake Intrusion

Cited by 35 publications

References 40 publications

A review of sulfur to selenium ratios in magmatic nickel–copper and platinum-group element deposits

A review of sulfur to selenium ratios in magmatic nickel–copper and platinum-group element deposits

The East Bull Lake Intrusive Suite: Remnants of a 2.48 GaLarge Igneous and Metallogenic Province in the Sudbury Area of the CanadianShield

Magmatic mineralization and hydrothermal enrichment of the High Grade Zone at the Lac des Iles palladium mine, northern Ontario, Canada

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