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Basalts from the deep ocean floor

Published online by Cambridge University Press:  14 March 2018

G. D. Nicholls
G. D. Nicholls*
Affiliation:
Geology Department, University of Manchester
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Summary

Basalts dredged from the floor of the deep ocean show general tholeiitic affinities. Some samples are rich in aluminium and of very similar composition to the Warner high-alumina basalt from California. Both olivine tholeiite and high-alumina basalt have been found in the form of glass in dredgings from the Mid-Atlantic Ridge, indicating that liquid magmas of both compositions have been erupted on to the sea bed in this area. In explanation of this association a tentative hypothesis of fractional melting of hydrated upper mantle material is proposed. It is suggested that under the mid-ocean ridges the ‘basaltic fraction’ of the mantle is locally in the form of an amphibole. Fractional incongruent melting of this amphibole appears to be a possible explanation of the range of composition encountered in dredged glass samples.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 373 - 388
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

Anderson, (C.A.), 1941. Univ. Calif. Bull. Dept. Geol. Sei., vol. 25, p. 347.Google Scholar
Boyd, (F.R.) and England, (J.L.), 1959. Carnegie Inst. Wash. Yearb. 58, p. 82.Google Scholar
Bullard, (E.C.), 1963. In, The Sea—-Ideas and Observations on Progress in the Study of the Seas, vol. 3, edit. M. N. Hill, Interscience, New York and London, p. 218.Google Scholar
Correns, (C.W.), 1930. Chemie der Erde, vol. 5, p. 76.Google Scholar
Hieezen, (B. C.), 1960. Scientific American, vol. 203, p. 99.Google Scholar
Hieezen, (B. C.), and Ewing, (M.), 1963. ln, The Sea-—Ideas and Observations on Progress in the Study of the Seas, vol. 3, edit M. N. Hill, Interscience, New York and London, p. 388.Google Scholar
Hersey, (J.B.), 1962. Journ. Geophys. Res., vol. 67, p. 1109.Google Scholar
Hess, (H.H.), 1962. Geol. Soc. Amer., Buddington vol., p. 599.Google Scholar
Kuno, (H.), 1960. Journ. Petrol., vol. 1, p. 121.CrossRefGoogle Scholar
Murray, (J.) and Renard, (A. F.), 1891. Report of the scientific results of the voyage of H.M.S. Challenger-—Deep Sea Deposits. H.M.S.O., London.Google Scholar
Nicholls, (G. D.), 1963. Sei. Prog., vol. 51, p. 12.Google Scholar
Nicholls, (G. D.), Nalwalk, (A.J.), and Hays, (E.E.), 1964. The nature and composition of rock samples dredged from the Mid-Atlantic Ridge between 22° and 52° N. Mar. Geol. In press.CrossRefGoogle Scholar
O'Hara, (M.J.) and Mercy (E. L. P.), 1963. Trans. Roy. Soe. Edln., vol. 65, p. 251.Google Scholar
Powers, (HI. A.), 1932. Amer. Min., vol. 17, p. 253.Google Scholar
Shand, (S.J.), 1949. Journ. Geol., vol. 57, p. 89.Google Scholar
Tilley, (C.E.), 1950. Quart. Journ. Geol. Soe., vol. 106, p. 37.Google Scholar
Wiseman, (J. D. H.), 1937. Scientific Reports of the John Murray Expedition, vol. 3, no. 1, London.Google Scholar
Yoder, (H.S.), Jr., 1954. Carnegie Inst. Wash. Yearb. 53, p. 106.Google Scholar
Yoder, (H.S.), Jr., and Tilley, (C.E.), 1962. Journ. Pctrol., vol. 3, p. 342.Google Scholar