angrite
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Angrites are a rare group of achondrites consisting mostly of Al-Ti bearing diopside, hedenbergite, olivine, anorthite and troilite with minor traces of phosphate and metals. The group is named for the Angra dos Reis meteorite. They are the oldest igneous rocks, with crystallization ages of around 4.56 billion years. Angrites are subdivided into two main groups, the quenched and plutonic angrites. The quenched angrites cooled rapidly upon the surface of the angrite parent body (APB), whereas the plutonic angrites cooled slower, deeper in the crust. The APB is thought to have been a similar siz
Key facts
- Meteorite subdivision.Subdivision
- Group
- Meteorite subdivision.Name
- Angrite
- Meteorite subdivision.Image
- NWA 2999 meteorite, angrite.jpg
- Meteorite subdivision.Image_caption
- A slice of NWA 2999. Note the similarity to a terrestrial basalt.
- Meteorite subdivision.Compositional_type
- Stony meteorite
- Meteorite subdivision.Type
- Achondrite
- Meteorite subdivision.Clan
- <!-- list/link all subgroups of this group as a
- Meteorite subdivision.Subgroups
- Quenched Plutonic
- Meteorite subdivision.Parent_body
- Possibly 289 Nenetta, 3819 Robinson or Mercury
- Meteorite subdivision.Number_of_specimens
- 30+
via Wikipedia infobox
Wikidata facts
- Image
- D'Orbigny meteorite, fragment.jpg
Show 1 more fact
- Commons category
- Angrites
Sources (1)
via Wikidata · CC0
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Article
5 sectionsContents
- Origin
- Notable meteorites
- See also
- External links
- References
Angrites are a rare group of achondrites consisting mostly of Al-Ti bearing diopside, hedenbergite, olivine, anorthite and troilite with minor traces of phosphate and metals. The group is named for the Angra dos Reis meteorite. They are the oldest igneous rocks, with crystallization ages of around 4.56 billion years. Angrites are subdivided into two main groups, the quenched and plutonic angrites. The quenched angrites cooled rapidly upon the surface of the angrite parent body (APB), whereas the plutonic angrites cooled slower, deeper in the crust. The APB is thought to have been a similar size to the asteroid 4 Vesta.
==Origin== Angrite meteorites are distinct from other meteoritic groups based on their oxygen isotopic compositions. Based on their Mn-Fe ratios in pyroxene and other isotopic compositions, the source of angrites is constrained to the inner Solar System. However, recent studies have suggested that the APB experienced mixing of multiple sources during its history.