Wehrlite - Wikipedia · Edge Rewrite

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Wehrlite
Composition
Igneous rock
Photomicrograph of a thin section of wehrlite, in cross-polarised light.
Classification	Ultramafic
Primary	olivine and clinopyroxene
Secondary	orthopyroxene, hornblende, spinel, garnet, anorthite, bytownite
Texture	Phaneritic

Wehrlite is an ultramafic and ultrabasic rock that is a mixture of olivine and clinopyroxene. It is a subdivision of the peridotites.

The nomenclature allows up to a few percent of orthopyroxene. Accessory minerals include ilmenite, chromite, magnetite and an aluminium-bearing mineral (plagioclase, spinel or garnet).^[1]

Wehrlites occur as mantle xenoliths and in ophiolites. Another occurrence is as cumulate in gabbro and norite layered intrusions.^[1] Some meteorites can also be classified as wehrlites (e.g. NWA 4797).^[2]

Wehrlite is named after Alois Wehrle.^[3] He was born 1791 in Kroměříž, Czech Republic (then Kremsier in Mähren) and was a professor at the "Ungarische Bergakademie" (Hungarian Mining School) in Banská Štiavnica, Slovakia (then Schemnitz, Kingdom of Hungary).^[4]

Brachinites

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Brachinites are a class of wherlitic primitive anachondrites that consist almost entirely of olivine, which ranges from 74 to 98% by volume. These often have accessory minerals such as plagioclase (6.7 to 12.9%), iron Sulfides (1.8 to 4.0%), clinopyroxene (1.5 to 8.2%) and orthopyroxene (0 to 2.4%) with traces of phosphates and meteoritic iron. The only deviation from regular chondrites is their high olivine to orthopyroxene ratio.^[5]

References

[edit]

1 2 "Glossary: Wehrlite". Imperial College. Retrieved 12 January 2013.^{[permanent dead link]}
↑ "NWA 4797" (PDF). curator.jsc.nasa.gov. Retrieved 12 January 2013.
↑ "Department of Mineralogy and Petrography". uni-miskolc.hu. Archived from the original on 13 April 2014. Retrieved 12 January 2013.
↑ "ADB:Wehrle, Alois". WikiSource. Retrieved 12 January 2013.
↑ Nehru, C. E.; M. Prinz; M. K. Weisberg; M. Ebihara; R. N. Clayton; T. K. Mayeda (1992). "Brachinites: A New Primitive Achondrite Group". Meteoritics. 27 (3): 267.

v t e Types of rocks
Igneous rock	Andesite Icelandite Boninite Sanukite Anorthosite Appinite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Carbonatite Natrocarbonatite Sovite Charnockite Enderbite Dacite Adakitic dacite Diabase Diorite Napoleonite Foidolite Ijolite Gabbro Troctolite Norite Hornblende gabbro Granite Alkali feldspar granite Monzogranite Leucogranite Granodiorite Granophyre Hornblendite Hyaloclastite Komatiite Lamproite Lamprophyre Monzonite Larvikite Quartz monzonite Monzogabbro Essexite Nepheline syenite Borolanite Nephelinite Obsidian Pegmatite Peridotite Wehrlite Dunite Harzburgite Lherzolite Hornblende peridotite Kimberlite Phonolite Phonotephrite Pumice Pyroxenite Websterite Clinopyroxenite Orthopyroxenite Quartz diorite Quartzolite Rhyodacite Rhyolite Comendite Pantellerite Scoria Reticulite Shonkinite Sideromelane Syenite Tachylite Tephriphonolite Tephrite Tonalite Trondhjemite Trachyandesite Benmoreite Latite Trachybasalt Hawaiite Trachyte Tuff Ignimbrite
Sedimentary rock	Banded iron formation Breccia Chert Flint Coal Lignite Anthracite Conglomerate Diamictite Diatomite Dolomite Evaporite Geyserite Jaspillite Laterite Limestone Calcarenite Chalk Coquina Lumachelle Marl Oolite Travertine Tufa Wackestone Mudstone Argillite Claystone Shale Siltstone Oil shale Phosphorite Sandstone Arkose Greywacke Gritstone Itacolumite Sylvinite Tillite Turbidite Varve
Metamorphic rock	Amphibolite Blueschist Cataclasite Corundite Eclogite Epidosite Gneiss Granulite Greenschist Hornfels Calcflinta Itabirite Jadeitite Lapis lazuli Litchfieldite Marble Migmatite Mylonite Metapelite Phyllite Pseudotachylite Quartzite Schist Serpentinite Skarn Slate Suevite Talc carbonate Soapstone Tectonite Tektite Moldavite Whiteschist
Specific varieties	Ganister Gossan Jasperoid Kenyte Larvikite Litchfieldite Llanite Luxullianite Mangerite Novaculite Pyrolite Rapakivi granite Rhomb porphyry Rodingite Taconite Teschenite Theralite Unakite Variolite Wad
Non-terrestrial rocks (meteorites)	Achondrite Primitive achondrite Asteroidal achondrite Lunar meteorite Martian meteorite Chondrite Carbonaceous chondrite Enstatite chondrite Ordinary chondrite Rumurutiite Iron meteorite Stony-iron meteorite Mesosiderite Pallasite

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Brachinites

References