Chalcopyrite-pyrrhotite-magnetite (Paleoproterozoic, 1.85 Ga; Creighton Mine, Sudbury Impact Structure, Ontario, Canada) 6

            Chalcopyrite-pyrrhotite-magnetite from the Precambrian of Ontario, Canada. (cut & polished surface; ~6.35 centimeters across at its widest)

Yellow brassy gold = chalcopyrite
Light grayish-brown = pyrrhotite
Dark gray to black = magnetite

This massive sulfide sample is from Ontario's Sudbury Mining District, which is famous for its economically-significant nickel- and copper-bearing minerals.  The Sudbury area is actually a tectonically deformed, very large impact structure - it is the # 3 largest preserved impact structure on Earth (the # 1 largest is Vredefort in South Africa; the # 2 largest is Chicxulub in Yucatan, Mexico).  The Sudbury Impact occurred about 1.85 billion years ago, during the late Paleoproterozoic.  The Sudbury Impact Structure is no longer circular or subcircular in shape - it's been compessed into a stretched-egg shape from an ancient continental collision event.

The dominant mineral in this specimen is chalcopyrite - CuFeS2 (copper iron sulfide).  Also present are pyrrhotite - Fe(1-x)S (imperfect iron monosulfide) and magnetite - Fe3O4 (iron oxide), both of which will stick to a magnet.

Mineralization age: syn-impact or early post-impact, late Paleoproterozoic, 1.85 Ga

Locality: Creighton Mine, Sudbury Mining District, southeastern Ontario, southeastern Canada

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Taken on: January 7, 2025

Tags:

chalcopyrite

pyrrhotite

Paleoproterozoic

Proterozoic

Precambrian

Creighton

Mine

Sudbury

Impact

Structure

Ontario

Canada

massive

sulfide

sulfides

iron

copper

oxide « less

Sets appears in: • Massive Sulfides • Ontario Rocks, Minerals, Geology more » • Sudbury Impact Structure (Paleoproterozoic, 1.85 Ga; Sudbury area, Ontario, Canada) • Paleoproterozoic Rocks & Fossils • Massive Sulfides (late Paleoproterozoic, 1.85 Ga; Sudbury Impact Structure, Ontario, Canada) « less

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