Title: Chemical characteristics and origin of oceanic ridge volcanic rocks<sup>1</sup>
Abstract: Journal of Geophysical Research (1896-1977)Volume 75, Issue 8 p. 1585-1613 Chemical characteristics and origin of oceanic ridge volcanic rocks1 R. Kay, R. KaySearch for more papers by this authorN. J. Hubbard, N. J. HubbardSearch for more papers by this authorP. W. Gast, P. W. GastSearch for more papers by this author R. Kay, R. KaySearch for more papers by this authorN. J. Hubbard, N. J. HubbardSearch for more papers by this authorP. W. Gast, P. W. GastSearch for more papers by this author First published: 10 March 1970 https://doi.org/10.1029/JB075i008p01585Citations: 456AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The major element, alkali metal, alkaline earth, rare earth, and nickel content of mid-ocean-ridge rocks from 30° North on the mid-Atlantic ridge, the Gorda rise, the Juan de Fuca ridge, and the equatorial East Pacific rise are presented. The mid-ocean ridge volcanic rocks are characterized by olivine tholeiite normative compositions with variable Al2O3 and total iron contents. Chondritic rare earth element (REE) relative-abundance patterns, with some depletion in La and Ba, are found in almost all samples. Negative europium anomalies are found to correlate with high total rare earth (RE) contents. The observed variations in chemical composition are ascribed to shallow differentiation dominated by plagioclase and olivine. The major characteristics described above are ascribed to extensive partial melting (∼30%) at shallow depths (15–25 km) in mantle material being intruded under the axial valley of the mid-ocean ridges. The extent of partial melting may be controlled by the total water content of the mantle. References Aumento, F., Magmatic evolution on the Mid-Atlantic ridge, Earth Planet. Sci. Lett., 2, 225, 1967. Aumento, F., The mid-Atlantic ridge near 45°N, 3, Basalts from the Confederation peak, Can. J. Earth Sci., 5, 1, 1968. Aumento, F., B. D. Loncarevic, The Mid-Atlantic ridge near 45°N, 3, Bald mountain, Can. J. Earth Sci., 6, 11, 1969. 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Publication Year: 1970
Publication Date: 1970-03-10
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 535
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