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- Ultrapotassic_igneous_rocks abstract "Ultrapotassic igneous rocks are a class of rare, volumetrically minor and generally ultramafic or mafic silica-depleted igneous rocks. Ultrapotassic rocks are defined by molar K2O/Na2O >3 in much of the scientific literature. In other papers written as recently as 2005, they are defined as rocks with weight percents K2O/Na2O >2. Hence, caution is indicated in interpreting use of the term "ultrapotassic", and the nomenclature of these rocks continues to be debated.Genesis of these ultrapotassic rocks has been much discussed. The magmas probably are produced by a variety of mechanisms and from a variety of sources. The magma production may be favored by the following: great depth of partial melting low degrees of partial melting lithophile element (K, Ba, Cs, Rb) enrichment in sources peridotite (variety harzburgite) so enriched, especially in potassium pyroxene and phlogopite-rich volumes within the mantle, not from peridotite alone carbon dioxide or water in sources (each condition leading to a distinctive magma); reaction of melts with surrounding rock as they rise from their sourcesMantle sources of ultrapotassic magmas may contain subducted sediments, or the sources may have been enriched in potassium by melts or fluids partly derived from subducted sediments. Phlogopite and/or potassic amphibole probably are typical in the sources from which many such magmas have been derived. Ultrapotassic granites are uncommon and may be produced by melting of the continental crust above upwelling mafic magma, such as at rift zones.".
- Ultrapotassic_igneous_rocks wikiPageID "4223880".
- Ultrapotassic_igneous_rocks wikiPageRevisionID "574894774".
- Ultrapotassic_igneous_rocks hasPhotoCollection Ultrapotassic_igneous_rocks.
- Ultrapotassic_igneous_rocks subject Category:Geochemistry.
- Ultrapotassic_igneous_rocks subject Category:Igneous_petrology.
- Ultrapotassic_igneous_rocks subject Category:Ultrapotassic_rocks.
- Ultrapotassic_igneous_rocks type NaturalObject100019128.
- Ultrapotassic_igneous_rocks type Object100002684.
- Ultrapotassic_igneous_rocks type PhysicalEntity100001930.
- Ultrapotassic_igneous_rocks type Rock109416076.
- Ultrapotassic_igneous_rocks type UltrapotassicRocks.
- Ultrapotassic_igneous_rocks type Whole100003553.
- Ultrapotassic_igneous_rocks comment "Ultrapotassic igneous rocks are a class of rare, volumetrically minor and generally ultramafic or mafic silica-depleted igneous rocks. Ultrapotassic rocks are defined by molar K2O/Na2O >3 in much of the scientific literature. In other papers written as recently as 2005, they are defined as rocks with weight percents K2O/Na2O >2.".
- Ultrapotassic_igneous_rocks label "Rocas ígneas ultrapotásicas".
- Ultrapotassic_igneous_rocks label "Ultrapotassic igneous rocks".
- Ultrapotassic_igneous_rocks sameAs Rocas_ígneas_ultrapotásicas.
- Ultrapotassic_igneous_rocks sameAs m.0bqvxr.
- Ultrapotassic_igneous_rocks sameAs Q7880616.
- Ultrapotassic_igneous_rocks sameAs Q7880616.
- Ultrapotassic_igneous_rocks sameAs Ultrapotassic_igneous_rocks.
- Ultrapotassic_igneous_rocks wasDerivedFrom Ultrapotassic_igneous_rocks?oldid=574894774.
- Ultrapotassic_igneous_rocks isPrimaryTopicOf Ultrapotassic_igneous_rocks.