Mapping the 3D extent of the Stillwater Complex, Montana—Implications for potential platinum group element exploration and development

Finn, Carol A.; Zientek, Michael L.; Parks, Heather L.; Peterson, D. E.

doi:10.1016/j.precamres.2020.105860

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…The original strike extent of the complex is unknown because the intrusion is located within a fault-bounded block, the Stillwater Block, part of the larger Beartooth Block of Archean basement rocks (Foose et al, 1961;Wise, 2000). Geophysical models indicate that the modern extent of the complex may have a maximum area between 2,240-5,000 km 2 and a total volume of 22,000 to 37,000 km 3 continuing at depth below the Phanerozoic sedimentary rocks to the north of the exposed complex (Bonini, 1982;Kleinkopf, 1985;Finn et al, 2020).…”

Section: Geologic Historymentioning

confidence: 99%

“…In general, cumulate layering dips moderately to steeply to the northeast while with some vertical to overturned layering present in the eastern part of the complex. The original thickness and areal extent of the complex is unknown, but geophysical evidence suggests that as much as 10 x the outcrop exposure of the complex may continue at depth under Phanerozoic sedimentary rocks to the northeast (Finn et al, 2020).…”

Section: Geologymentioning

confidence: 99%

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The petrology of the J-M Reef Pd-Pt deposit and the Lower Banded series of the Stillwater Complex, Montana, USA

Jenkins¹

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The J-M Reef, of the Lower Banded series (LBS) in the Neoarchean Stillwater Complex, is the highest-grade platinum group element (PGE) deposit on Earth. The J-M Reef is a ~1.5 m thick stratiform accumulation of high tenor disseminated sulfide and platinum group minerals hosted in coarse-grained heteradcumulates called the Reef Package. The grades and sulfide tenors of the reef vary from one part of the Stillwater Complex to another due to variable amounts of silicate and sulfide liquid equilibration.The cumulates in the LBS can be modeled by batch crystallization of a komatiitic parental melt contaminated by lower crustal rocks. Emplacement of crystal-bearing slurries produces the noritic and gabbronoritic cumulates that account for most of the rocks in the LBS.The olivine-bearing rocks of the LBS are modeled by infiltration and partial melting of footwall gabbronorites by an influx of hot, dense contaminated komatiitic parental melt. This infiltration First and foremost, I cannot express enough gratitude to Jim Mungall for taking me on as an international student, first at the University of Toronto and then for offering me a PhD position at Carleton. Jim was a brilliant mentor and supervisor, and always allowed me to pursue different avenues of research and was always there to make suggestions when things were difficult or didn't work out as I had hoped. I forever grateful for Jim's patience and understanding of my situation as a graduate student with a young family. I am thankful for the friends and colleagues that were a part of Jim's research group in the Mineral Deposits Lab over the years including

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Section: Geologic Historymentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%