Olivine phenocrysts of Hawaiian olivine tholeiite and oceanite |
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| Authors: | Sven Maaløe Birger Hansen |
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| Institution: | (1) Department of Geology, Allegaten 41, 5014 Bergen, Norway;(2) Geologisk Institut, Århus Universitet, 8000 Århus, Denmark |
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| Abstract: | Olivine phenocrysts of Hawaiian tholeiites display a variety of textures and a variation in composition which is due to supercooled crystallization. The highest forsterite content measured is 91%, and the highest magnesia content estimated for a tholeiitic liquid is 17%, using the olivine geothermometer. The liquid of this composition may be either a primary magma or a primitive magma. It is not yet possible to specify any particular composition range for the primary Hawaiian tholeiites. |
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