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A layered intrusion is a large sill -like body of igneous rock which exhibits vertical layering or differences in composition and texture. These intrusions can be many kilometres in area covering from around 100 km 2 (39 sq mi) to over 50,000 km 2 (19,000 sq mi) and several hundred metres to over one kilometre (3,300 ft) in thickness. [1]
The Skaergaard intrusion was first discovered by Lawrence Wager on his Arctic Air-Route Expedition in 1930. [1] In 1933, the first aerial photography of the region was taken in order to create a topographic map of the area. [1] The first scientific expedition to the intrusion took place in 1935 and 1936 and lasted over 13 months. [1]
In geology, an igneous intrusion (or intrusive body[ 1 ] or simply intrusion[ 2 ]) is a body of intrusive igneous rock that forms by crystallization of magma slowly cooling below the surface of the Earth. Intrusions have a wide variety of forms and compositions, illustrated by examples like the Palisades Sill of New York and New Jersey; [ 3 ...
The Bushveld Igneous Complex (BIC) is the largest layered igneous intrusion [ 1 ][ 2 ] within the Earth's crust. [ 3 ] It has been tilted and eroded forming the outcrops around what appears to be the edge of a great geological basin: the Transvaal Basin. It is approximately two billion years old [ 4 ] and is divided into four limbs: northern ...
A specific example is the Skaergaard intrusion in Greenland. At Skaergaard a 2500 m thick layered intrusion shows distinct chemical and mineralogic layering: [3] Plagioclase varies from An 66 near the base to An 30 near the top (An xx = anorthite percentage) CaO 10.5% base to 5.1% top; Na 2 O + K 2 O 2.3% base to 5.9% top
Pages in category "Layered intrusions". The following 13 pages are in this category, out of 13 total. This list may not reflect recent changes . Layered intrusion.
Ore grade is about 2.5 ounces of Pd-Pt per ton of rock, with a Pd-Pt ratio of about 3:1. The Stillwater igneous complex is a large layered mafic intrusion (LMI) located in southern Montana in Stillwater, Sweet Grass and Park Counties. The complex is exposed across 30 miles (48 km) of the north flank of the Beartooth Mountain Range.
Metamorphic rock, deformed during the Variscan orogeny, at Vall de Cardós, Lérida, Spain. Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than 150 to 200 °C (300 to 400 °F) and, often, elevated pressure ...