Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Contrasting styles of Pd-rich magmatic sulfide mineralization in the Lac des Iles intrusive complex, Ontario, Canada

M. L. Djon, D. C. Peck, G. R. Olivo, J. D. Miller and B. Joy
Contrasting styles of Pd-rich magmatic sulfide mineralization in the Lac des Iles intrusive complex, Ontario, Canada
Economic Geology and the Bulletin of the Society of Economic Geologists (May 2018) 113 (3): 741-767

Abstract

Field, mineralogical, and geochemical investigations were conducted on previously identified platinum group element and copper-nickel (PGE-Cu-Ni) sulfide prospects in the North Lac des Iles Complex, located in northwestern Ontario, Canada. The results reveal that the North Lac des Iles Complex prospects are hosted by layered websterite, olivine websterite, and gabbronorite that display variable degrees of hydrous alteration and contain 0.5 to 2% disseminated Fe-Cu-Ni sulfide mineralization. Sulfide minerals are generally characterized by pyrrhotite/(chalcopyrite + pyrrhotite) ratios near 2. S/Se ratios overlap with those of mantle-derived magmas. The prospects have moderate Pd tenors (<1,000 ppm) and exhibit an average Pd/Pt ratio of 2.89 that remains constant with increasing Pd grades. Most occurrences contain Pd-rich platinum group minerals that are dominated by tellurides, bismuthotellurides, and arsenides. It is suggested that sulfide saturation and PGE concentration in the North Lac des Iles Complex resulted from a combination of fractional crystallization and dynamic recharge involving two compositionally distinct ultramafic parental magmas. It is now evident that the Lac des Iles Complex hosts two major styles of Pd-rich PGE-Cu-Ni sulfide mineralization, namely magmatic breccia style, typical of the Roby and Offset deposits in the South Lac des Iles Complex, and stratiform style, typical of the layered ultramafic series rocks in the North Lac des Iles Complex.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 113
Serial Issue: 3
Title: Contrasting styles of Pd-rich magmatic sulfide mineralization in the Lac des Iles intrusive complex, Ontario, Canada
Affiliation: North American Palladium, Thunder Bay, ON, Canada
Pages: 741-767
Published: 201805
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 77
Accession Number: 2018-079356
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N48°57'00" - N49°17'60", W90°00'00" - W89°25'60"
Secondary Affiliation: University of Minnesota-Duluth, USA, United StatesQueen's University, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201844
Close Modal

or Create an Account

Close Modal
Close Modal