 |
|
|
Ultramafic to mafic layered intrusions | A Wisdom Archive on Ultramafic to mafic layered intrusions | | Ultramafic to mafic layered intrusions A selection of articles related to Ultramafic to mafic layered intrusions | |
|
|
More material related to Ultramafic To Mafic Layered Intrusions can be found here:
|
|
|
| | |
Anorthosite, Anorthosite - Age, Anorthosite - Archean anorthosite, Anorthosite - Chemical and isotopic characteristics, Anorthosite - Economic value of anorthosite, Anorthosite - High-alumina orthopyroxene megacrysts, Anorthosite - Mode of occurrence, Anorthosite - Origins of Proterozoic anorthosites, Anorthosite - Physical characteristics, Anorthosite - Proterozoic anorthosite, List of rocks, Ultramafic to mafic layered intrusions, Ultramafic rocks
| | |
|
ARTICLES RELATED TO Ultramafic to mafic layered intrusions | |
| | |  Ultramafic to mafic layered intrusions: Encyclopedia II - Anorthosite - Proterozoic anorthosite
Anorthosite - Age.
Although a few anorthosite bodies were emplaced either late in the Archean Eon, or early in the Phanerozoic Eon, the vast majority of Proterozoic anorthosites were emplaced, as their name suggests, during the Proterozoic Eon (ca. 2500-542 Ma).
Anorthosite - Mode of occurrence.
Anorthosite plutons occur in a wide range of sizes. Some smaller plutons, exemplified by many anorthosite bodies in the U.S., cover only a few dozen square kilometres. Larger plutons, like the Mt. Lister Anorthosite, in northern Labrador ...
See also:Anorthosite, Anorthosite - Proterozoic anorthosite, Anorthosite - Age, Anorthosite - Mode of occurrence, Anorthosite - Physical characteristics, Anorthosite - Chemical and isotopic characteristics, Anorthosite - Origins of Proterozoic anorthosites, Anorthosite - High-alumina orthopyroxene megacrysts, Anorthosite - Archean anorthosite, Anorthosite - Economic value of anorthosite Read more here: » Anorthosite: Encyclopedia II - Anorthosite - Proterozoic anorthosite |
| |
|
|
|
|
| | | | Ultramafic to mafic layered intrusions: Encyclopedia II - Anorthosite - Economic value of anorthosite The primary economic value of anorthosite bodies is the titanium-bearing oxide ilmenite. However, some Proterozoic anorthosite bodies have large amounts of labradorite, which is quarried for its value as both a gemstone and a building material. Archean anorthosites, because they are calcium-rich, have large amounts of aluminium substituting for silicon; a few of these bodies are mined as ores of aluminium.
Anorthosite was prominently represented in rock samples brought back from the Moon, and ...
See also:Anorthosite, Anorthosite - Proterozoic anorthosite, Anorthosite - Age, Anorthosite - Mode of occurrence, Anorthosite - Physical characteristics, Anorthosite - Chemical and isotopic characteristics, Anorthosite - Origins of Proterozoic anorthosites, Anorthosite - High-alumina orthopyroxene megacrysts, Anorthosite - Archean anorthosite, Anorthosite - Economic value of anorthosite Read more here: » Anorthosite: Encyclopedia II - Anorthosite - Economic value of anorthosite |
| |
|
|
|
| | | | Ultramafic to mafic layered intrusions: Encyclopedia II - Ultramafic to mafic layered intrusions - Causes of layering The causes of layering in large ultramafic intrusions include convection, thermal diffusion, assimilation of wall rocks and fractional crystallization.
The primary mechanism for forming cumulate layers is of course the accumulation of layers of mineral crystals on the floor or roof of the intrusion. Rarely, plagioclase is found in cumulate layers at the top of intrusions, having floated to the top of a much denser magma. Here it can form anorthosite layers.
Accumulation occurs as crystals are formed by fractional crystallisatio ...
See also:Ultramafic to mafic layered intrusions, Ultramafic to mafic layered intrusions - Intrusive behaviour and setting, Ultramafic to mafic layered intrusions - Intrusive Mechanisms, Ultramafic to mafic layered intrusions - Plume Magmatism, Ultramafic to mafic layered intrusions - Rift magmatism, Ultramafic to mafic layered intrusions - Causes of layering, Ultramafic to mafic layered intrusions - Examples Read more here: » Ultramafic to mafic layered intrusions: Encyclopedia II - Ultramafic to mafic layered intrusions - Causes of layering |
| |
|
| |
|
|
|
|
More material related to Ultramafic To Mafic Layered Intrusions can be found here:
|
|
|
|
| |
