Melting relations of some ultra alkali volcanics | Zendy

Tilley C. E. | Zendy; Thompson R. N. | Zendy

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Melting relations of some ultra alkali volcanics

Author(s) -

Tilley C. E.,

Thompson R. N.

Publication year - 1972

Publication title -

geological journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.721

H-Index - 54

eISSN - 1099-1034

pISSN - 0072-1050

DOI - 10.1002/gj.3350080106

Subject(s) - melilite , leucite , geology , olivine , geochemistry , lava , volcano , nepheline , materials science , paleontology , metallurgy , ceramic , spinel

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, 1118°C to 1300°C for the olivine nephelinites. For the most part the liquidi follow a course dependent on iron‐enrichmcnt. Notable departures are examples rich in leucite.

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