Basalts from the Solomon and Bismarck Seas |
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| Authors: | H L Davies and R C Price |
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| Institution: | (1) Bureau of Mineral Resources, GPO Box 378, 2601 Canberra ACT, Australia;(2) Geology Department, La Trobe University, 3083 Bundoora Vic, Australia |
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| Abstract: | Volcanic rocks collected from the Solomon Sea Basin are mostly ferrobasalt lavas similar to evolved MORB; an exception is a single sample of basaltic crystal tuff invaded by later basalt. The rocks contain labradorite, aluminous diopsidic augite, and titanomagnetite, with olivine and pigconite in the more vitrophyric samples, and segregation vesicles in some. Cobbles dredged from Gudaraba Canyon, south of the Solomon Sea Basin, include both MORB-like glassy lava and K-metasomatised basalt and andesite(?). Two small pieces of volcanic glass from the southern Bismarck Sea are more primitive MOR-type basalts. |
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