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Alteration of olivine in a basalt from central France

โœ Scribed by Ward Chesworth; Jean Dejou; Pierre Larroque; Eduardo Garcia Rodeja

Book ID
116343983
Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
628 KB
Volume
56
Category
Article
ISSN
0341-8162

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High-titania alkali-olivine basalts of n
High-titania alkali-olivine basalts of north-central Oregon, U.S.A.
โœ Paul T. Robinson ๐Ÿ“‚ Article ๐Ÿ“… 1969 ๐Ÿ› Springer ๐ŸŒ English โš– 683 KB

In north-central Oregon numerous small flows of alkali-olivine basalt occur in the Oligocene to early Miocene John Day Formation. Chemically, these basalts are characterized by relatively low SiO 2 and K20 and very high TiO2 and iron. Fifteen analysed specimens (44 to 48 percent SiO2) have an averag