Layered Intrusions Archive

Layered Intrusions

Bushveld

Intrusion name: Bushveld

Age: 2056.88 ± 0.41 Ma

Era/Period: Precambrian

Country: South Africa

Latitude, Longitude: 25.5° S  28.5° E

Areal extent: 66,000 km2

 

 

Dufek

Intrusion name: Dufek

Age:183.9 ± 0.3 Ma

Era/Period: Jurassic

Country: Antarctica

Latitude, Longitude: 82.5° S 51.5° W

Areal extent: 50,000 km2

Duluth

Intrusion name: Duluth

Age: 1099.1 ± 0.2 Ma

Era/Period: Precambrian

Country: USA

Latitude, Longitude: 47.75º N 90.33º W

Areal extent: 4,700 km2

Stillwater

Intrusion name: Stillwater

Age: 2709.05 ± 0.85 Ma

Era/Period: Precambrian

Country: USA

Latitude, Longitude: 45.39° N, 109.90° W

Areal extent: 4,400 km2

Muskox

Intrusion name: Muskox

Age: 1268.8 ± 1.7 Ma

Era/Period: Canada

Country: South Africa

Latitude, Longitude: 67º N 115º W

Areal extent: 3,500 km2

Great Dyke

Intrusion name: Great Dyke

Age: 2575.9 ± 1.0 Ma

Era/Period: Precambrian

Country: Zimbabwe

Latitude, Longitude: 17.5º S 30.6º E

Areal extent: 3,300 km2

Kiglapait

Intrusion name: Kiglapait

Age: 1305 ± 22 Ma

Era/Period: Precambrian

Country: Canada

Latitude, Longitude: 57º N 61.5º W

Areal extent: 560 km2

Skaergaard

Intrusion name: Skaergaard

Age: 55.96±0.018 Ma

Era/Period: Eocene

Country: Greenland

Latitude, Longitude: 68.17 °N, 31.65° W

Areal extent: 88 km2

Volume: 280 km3

Notable feature(s): Shows extreme fractionation trends from the crystallization of basaltic magma.

Panzhihua

Name: Panzhihua Intrusion

Age: 260 Ma

Period/Era: Permian

Country: China

Latitude, Longitude: 26.67 °N, 101.75°E

Areal extent: ~30 km2

Notable features: A part of the Emeishan large igneous province and host of a large Fe-Ti-V ore deposit

Rum

Intrusion name: Rum intrusion

Age: 60 Ma

Period/Era: Palaeocene

Country: Scotland

Latitude, Longitude: 56.98 °N, 6.29°W

Areal extent: 30 km2

Notable features: Eastern portion comprised of 16 macro-rhythmic units, each traditionally taken as a new replenishment of primitive magma. Western portion composed dominantly of harrisite, an olivine-bearing crescumulate. More recently, Rum has been shown to be an important locality for reactive melt percolation and for the in situ formation of chromitite seams plus attendant platinum-group element mineralisation.