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Foidita tefrítica

Infotaula de rocaFoidita tefrítica
Tipusroques ígnies (roques volcàniques)
Minerals essencialsfeldespatoides, plagiòclasi
Referències[1]

Les foidites tefrítiques són roques ígnies volcàniques alcalines constituïdes per feldespatoides (entre un 60 i un 90%) i plagiòclasi. És definida modalment al camp 15b del diagrama QAPF de Streckeisen. Es distingeix de la foidita basanítica perquè conté menys del 10% d'olivina modal. És possible canviar el terme tot exposant l'espècie de feldspatoide dominant; per exemple: leucitita tefrítica, nefelinita tefrítica, etc.

Referències

[modifica]
  1. «Foidita tefrítica». Diccionari de geologia. [Consulta: 9 novembre 2017].[Enllaç no actiu]
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Foidita tefrítica
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