Some basaltic provinces

Details Some basaltic provinces Some basaltic provinces

Apr 1955

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955gecoa...7..177g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 7, Issue 3-4, pp.177-188

Computer Science

5

Scientific paper

Areal averages are computed for basalts from the Pacific (12 areas, 116 analyses) and the Atlantic (9 areas, 25 analyses). Also tabulated are 31 averages of Cenozoic, 12 of Mesozoic, 6 of Paleozoic, and 8 of Precambrian basaltic provinces throughout the world. It is concluded that (1) the bulk of oceanic basalts are silica-undersaturated, (2) there ia no consistent variation in the composition of basalt magma with time, and (3) there are no distinct types of basalt magma, but rather a continuous series from silicasaturated (tholeiitic) to silica-undersaturated (olivine-basaltic) rocks. This seems in accord with the theory that basaltic magma is formed by partial melting of the upper mantle.

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