Cenozoic calc-alkaline ignimbrites and related lavas from N.W. Sardinia (Italy), which are closely associated with andesites, have dacitic to rhyolitic composition. The ignimbritic rocks underwent fractional crystallization dominated by plagioclase. The model calculations for REE, Ba, Sr, and Rb are
A note on the petrology and geochemistry of Obsidian and Bumice from Iceland
β Scribed by P. Klein; F. Kluger; H. Wieseneder
- Publisher
- Springer
- Year
- 1979
- Tongue
- English
- Weight
- 390 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1438-1168
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## Abstract At least 12 silicic tephra layers (SILK tephras) erupted between ca. 6600 and ca. 1675 yr BP from the Katla volcanic system, have been identified in southern Iceland. In addition to providing significant new knowledge on the Holocene volcanism of the Katla system which typically produce
The Jequie granulitic complex is part of the extensive high-grade metamorphic terrain located within the Sao Francisco craton of northeastern Brazil. Some Jequie rocks appear to have been formed in the middle Archean (~3.1 Ga) from preexisting sialic crust\_ The dominant mineral composition of these