Class of rare ultramafic or mafic igneous rocks rich in potassium
A dike composed of the ultrapotassic igneous rock, lamprophyre
Ultrapotassic igneous rocks are a class of rare, volumetrically minor, generally ultramafic or mafic silica-depleted igneous rocks.
While there are debates on the exact classifications of ultrapotassic rocks, they are defined by using the chemical screens K2O/Na2O > 3 in much of the scientific literature.[1] However caution is indicated in interpreting the use of the term "ultrapotassic", and the nomenclature of these rocks continues to be debated, with some classifications using K2O/Na2O > 2 to indicate a rock is ultrapotassic.
^Foley, S.F.; Venturelli, G.; Green, D.H.; Toscani, L. (April 1987). "The ultrapotassic rocks: Characteristics, classification, and constraints for petrogenetic models". Earth-Science Reviews. 24 (2): 81–134. doi:10.1016/0012-8252(87)90001-8.
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Ultrapotassicigneousrocks are a class of rare, volumetrically minor, generally ultramafic or mafic silica-depleted igneousrocks. While there are debates...
metamorphic. Igneousrocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in...
enriched in Fe and Mg, such as carbonatites and ultrapotassicigneousrocks. Intrusive ultramafic rocks are often found in large, layered ultramafic intrusions...
Magnesium-rich igneous rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre – Ultrapotassicigneousrocks – An ultramafic...
content of the igneous rock. Several igneous associations are noted: high-alumina basalts, ultrapotassicigneousrocks, and ultramafic rocks. The basaltic...
rules. Kimberlite – Igneous rock which sometimes contains diamonds Lamprophyre – UltrapotassicigneousrocksUltrapotassicigneousrocks – Class of rare ultramafic...
mineral in ultrapotassicigneousrocks such as kimberlites, carbonatites, and lamprophyre, owing to the unusual magma genesis of these rocks.[citation...
rocks particularly rich in either sodium or potassium—as are ultrapotassicigneousrocks. Albert Johannsen, A Descriptive Petrography of the Igneous Rocks...
Export-grade DSO ores are generally in the 62–64% Fe range. Granite and ultrapotassicigneousrocks were sometimes used to segregate magnetite crystals and form...
B. 2008. The Mountain Pass Rare Earth carbonatite and associated ultrapotassicrocks, California. Canadian Mineralogist 46, 779–806. Xie, Y., Hou, Z....
S2CID 129258198. Washington, Henry Stephens (1917). Chemical Analyses of IgneousRocks: Pub. from 1884 to 1913, Inclusive, with a Critical Discussion of the...
the flow. Rocks rich in MgO, K2O, Ba, Cs, and Rb may be lamprophyres, kimberlites or other rare ultramafic, potassic or ultrapotassicrocks. Komatiites...
Ridge rocks consist of various gneisses of upper amphibolite and granulite facies, intruded by charnockite and granitoid rocks. These igneousrocks were...
The peperino of the neighborhood of Rome is a leucitite tuff. Ultrapotassicigneousrocks Phonolite Jackson, Julia A., ed. (1997). "ugandite". Glossary...
Leucogranite is a light-colored, granitic, igneous rock containing almost no dark minerals. Alaskite is a synonym. Leucogranites have been reported from...
intrusive Neoarchean plutonic rocks ranging in composition from gabbro to syenogranite. The Kaminak supracrustal belt preserves igneous textures including interlocking...
on the west side than the east. The sedimentary rocks of the basin are extensively intruded by igneous plugs, dikes and sills of Eocene to Oligocene age...
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