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- Picrite_basalt abstract "Picrite basalt, picrobasalt or oceanite[citation needed] is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts (20 to 50%) and black to dark brown pyroxene, mostly augite.The olivine-rich picrite basalts that occur with the more common tholeiitic basalts of Kīlauea and other volcanoes of the Hawaiian Islands are the result of accumulation of olivine crystals either in a portion of the magma chamber or in a caldera lava lake. The compositions of these rocks are well represented by mixes of olivine and more typical tholeiitic basalt.The name "picrite" can also be applied to an olivine-rich alkali basalt: such picrite consists largely of phenocrysts of olivine and titanium-rich augite pyroxene with minor plagioclase set in a groundmass of augite and more sodic plagioclase and perhaps analcite and biotite.Picrites and komatiites are somewhat similar chemically, but differ in that komatiite lavas are products of more magnesium-rich melts, and good examples exhibit the spinifex texture. In contrast, picrites are magnesium-rich because crystals of olivine have accumulated in more normal melts by magmatic processes. Komatiites are largely restricted to the Archean.When the term oceanite was apparently first proposed by Antoine Lacroix, he used the term to apply only to basalts with more than 50% olivine content (an extremely rare occurrence). Picrite basalt is found in the lavas of Mauna Kea and Mauna Loa in Hawaiʻi, Curaçao, in the Piton de la Fournaise volcano on Réunion Island and various other oceanic island volcanoes.Picrite basalt has been erupted in historical times from Mauna Loa during the eruptions of 1852 and 1868 (from different flanks of Mauna Loa).Picrite basalt with 30% olivine commonly erupts from the Piton de la Fournaise. [6]".
- Picrite_basalt thumbnail Oceanite_grand_brule_dsc03601.jpg?width=300.
- Picrite_basalt wikiPageExternalLink picrite.html.
- Picrite_basalt wikiPageExternalLink difference.html.
- Picrite_basalt wikiPageExternalLink 88.html.
- Picrite_basalt wikiPageID "2521540".
- Picrite_basalt wikiPageRevisionID "595377913".
- Picrite_basalt hasPhotoCollection Picrite_basalt.
- Picrite_basalt subject Category:Aphanitic_rocks.
- Picrite_basalt subject Category:Basalt.
- Picrite_basalt subject Category:Mafic_rocks.
- Picrite_basalt subject Category:Ultramafic_rocks.
- Picrite_basalt subject Category:Volcanology.
- Picrite_basalt type AphaniticRocks.
- Picrite_basalt type MaficRocks.
- Picrite_basalt type NaturalObject100019128.
- Picrite_basalt type Object100002684.
- Picrite_basalt type PhysicalEntity100001930.
- Picrite_basalt type Rock109416076.
- Picrite_basalt type UltramaficRocks.
- Picrite_basalt type Whole100003553.
- Picrite_basalt comment "Picrite basalt, picrobasalt or oceanite[citation needed] is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine.".
- Picrite_basalt label "Basalto picrítico".
- Picrite_basalt label "Picriet".
- Picrite_basalt label "Picrita".
- Picrite_basalt label "Picrite basalt".
- Picrite_basalt label "Picrite".
- Picrite_basalt label "Pikrit".
- Picrite_basalt label "Pikryt".
- Picrite_basalt label "Пикрит".
- Picrite_basalt label "苦榄岩".
- Picrite_basalt sameAs Pikrit.
- Picrite_basalt sameAs Pikrit.
- Picrite_basalt sameAs Picrita.
- Picrite_basalt sameAs Picrite.
- Picrite_basalt sameAs Picriet.
- Picrite_basalt sameAs Pikryt.
- Picrite_basalt sameAs Basalto_picrítico.
- Picrite_basalt sameAs m.07kp40.
- Picrite_basalt sameAs Q584099.
- Picrite_basalt sameAs Q584099.
- Picrite_basalt sameAs Picrite_basalt.
- Picrite_basalt wasDerivedFrom Picrite_basalt?oldid=595377913.
- Picrite_basalt depiction Oceanite_grand_brule_dsc03601.jpg.
- Picrite_basalt isPrimaryTopicOf Picrite_basalt.
