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Science 30 October 1992:
Vol. 258. no. 5083, pp. 796 - 799
DOI: 10.1126/science.258.5083.796
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Articles

Contribution of Oceanic Gabbros to Sea-Floor Spreading Magnetic Anomalies

Efichi Kikawa 1 and Kazuhito Ozawa 2

1 Department of Geophysics and the Geodynamics Research Institute, Texas A&M University, College Station, TX 77843-3114, and Marine Geology Department, Geological Survey of Japan, Tsukuba 305, Japan
2 Department of Geology and Geophysics, Yale University, Post Office Box 6666, New Haven, CT 06511-8130, and Geological Institute, University of Tokyo, Tokyo 113, Japan

The contribution of oceanic gabbros, representative rocks for layer 3 of the oceanic crust, to sea-floor spreading magnetic anomalies has been controversial because of the large variation in magnetic properties. Ocean Drilling Program (ODP) Leg 118 contains a continuous 500.7-meter section of oceanic gabbro that allows the relations between magnetization and petrologic characteristics, such as the degree of metamorphism and the magmatic evolution, to be clarified. The data suggest that oceanic gabbros, together with the effects of metamorphism and of magmatic evolution, account for a significant part of the marine magnetic anomalies.

Accepted on August 25, 1992


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Formation of Magnetic Single-Domain Magnetite in Ocean Ridge Basalts with Implications for Sea-Floor Magnetism.
Y.-H. Shau, Y.-H. Shau, D. R. Peacor, and E. J. Essene (1993)
Science 261, 343-345
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