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Occurrence of pumpellyite in hydrothermally altered basalts from the Vema fracture zone (mid-Atlantic ridge)
- Source :
- Contributions to Mineralogy and Petrology; July 1981, Vol. 76 Issue: 4 p386-393, 8p
- Publication Year :
- 1981
-
Abstract
- Metabasalts with abundant pumpellyite have been dredged in the Vema fracture zone, Atlantic ocean, and contain prehnite+pumpellyite±epidote+chlorite+white mica. The prehnite — pumpellyite association in these rocks differs from the prehnite-epidote association for most of the prehnite — pumpellyite facies metabasalts from the ocean crust described previously. The occurrence of pumpellyite is discussed in terms of temperature conditions, $$\mu _{H_2 O} $$ and oxygen fugacity and the pumpellyiterich metabasalts are believed to be recrystallized by hydrothermal circulation of seawater at about 250° C under a very low pressure (<1 kb).
Details
- Language :
- English
- ISSN :
- 00107999 and 14320967
- Volume :
- 76
- Issue :
- 4
- Database :
- Supplemental Index
- Journal :
- Contributions to Mineralogy and Petrology
- Publication Type :
- Periodical
- Accession number :
- ejs15557649
- Full Text :
- https://doi.org/10.1007/BF00371480