Black lacustrine mudshale (Nonesuch Shale, Mesoproterozoic, ~1.07-1.08 Ga; White Pine Mine area, Upper Peninsula of Michigan, USA) 7

            Black lacustrine mudshale from the Precambrian of Michigan, USA. (cross-section view)

This rock is from the Nonesuch Formation, a 1.07 to 1.08 billion years old, nonmarine, mixed siliciclastics unit in northern Michigan.  In places, for example the White Pine Mine, the Nonesuch Formation has been partially mineralized with native copper (Cu).  Copper can occur as fracture fillings or as scattered, small, intergranular masses or can partially replace bulk rocks.  Nonesuch rocks also host copper sulfides, such as chalcocite (Cu2S).

Stratigraphy: Nonesuch Formation (Nonesuch Shale), middle Oronto Group, upper Keweenawan Supergroup, upper Mesoproterozoic, ~1.07 to 1.08 Ga

Locality: White Pine Mine area (probably from a late 1940s experimental shaft emplaced before the White Pine Mine actually opened), Upper Peninsula of Michigan, USA

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Taken on: February 22, 2024

Tags:

black

shale

lacustrine

nonmarine

sedimentary

rock

rocks

White

Pine

Mine

Upper

Peninsula

Michigan

Nonesuch

Formation

Oronto

Group

Precambrian

Proterozoic

Mesoproterozoic

Keweenawan

Supergroup « less

Sets appears in: • Michigan Rocks, Minerals, & Fossils • Mesoproterozoic Rocks, Minerals, Fossils more » • Nonesuch Formation (Mesoproterozoic; Upper Peninsula of Michigan, USA) « less

Stats: 118 views

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