Search results
Results from the WOW.Com Content Network
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 ...
Intrusive rock. Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks. [1][2][3] Intrusion is one of the two ways igneous rock can form. The other is extrusion, such as a volcanic eruption or similar event.
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.
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
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 ...
Setting. The Windimurra Igneous Complex is part of the c. 2813 Ma Meeline Suite of mafic-ultramafic layered intrusions of the central Murchison Domain, Yilgarn Craton of Western Australia. [1] It is a conical body, approximately 7 km thick, primarily composed of layered gabbroic rocks, which intrude into c. 2820 Ma Norie Group rocks of the ...