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Melting relations of some ultra alkali volcanics

✍ Scribed by C. E. Tilley; R. N. Thompson

Book ID: 102225797
Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 210 KB
Volume: 8
Category: Article
ISSN: 0072-1050
DOI: 10.1002/gj.3350080106

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✦ Synopsis

The melting relations of a group of ultra alkali lavas are determined. They include a range of types rich in melilite and nepheline (melilite nephelinites) from the Nyiragongo volcano of the Congo and a group rich in olivine (olivine nephelinites).

The liquidi of these assemblages range from 1100°C (the melilite nephelinite of the lava lake of Nyiragongo) through the Cameroons etindite (clinopyroxene nephelinite, 11 IS0C) to 1300'C for the olivine nephelinites. For the most part the liquidi follow a course dependent on ironcnrichment. Notable departures are examples rich in leucite. rock series. Carnegie Inst. of Washington. Year Book 64, 69.

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