Oceanic Basalt Magnetic Properties and the Vine and Matthews Hypothesis

Author(s): Lowrie, W.
Volume Title: Geomagnetic Anomalies, Rock Magnetism and Petrography; Aspects of Rock Magnetism, Oceanic Material
Source: Geomagnetic Anomalies, Rock Magnetism and Petrography; Aspects of Rock Magnetism, Oceanic Material. Journal of Geophysics = Zeitschrift für Geophysik, 40(4), p.513-536. Publisher: Springer-Verlag, Berlin, Federal Republic of Germany. ISSN: 0340-062X CODEN: ZEGEA7
Note: In English; illus. (incl. sketch map)
Summary: The magnetic properties of basalts from 26 Deep Sea Drilling Project sites, including Antarctic areas, are described and compared with the requirements of the Vine and Matthews hypothesis. Königsberger ratios of DSDP basalts were rather low (mean value around 7) but were usually high enough to justify interpreting oceanic anomalies with a remanent magnetization model. Natural remanent magnetizations were considerably lower than in dredged basalts but were strong enough to account for amplitudes of oceanic magnetic anomalies. Both stable and unstable remanent types were encountered. The observed stable inclinations showed a large scatter when compared to expected inclinations, largely due to non-cancellation of secular variation. All the basalts were categorized in deuteric oxidation Class I by opaque petrology observations. Extensive maghemitization, inferred from thermomagnetic analyses, may explain the low NRM intensities. Unstable specimens easily acquired large viscous remanent magnetizations, in some cases as large as the NRM. The basalt magnetic properties were in general accord with the expectations of the Vine and Matthews hypothesis. (Auth. mod.)
Year of Publication: 1974
Research Program: DSDP Deep Sea Drilling Project
Key Words: 17 Geophysics, General; Anomalies; Basalts; Concepts; Deep Sea Drilling Project; Demagnetization; Experimental studies; Igneous rocks; Ilmenite; Inclination; Interpretation; Maghemitization; Magnetic properties; Magnetization; Matthews; Minerals; Natural remanent magnetization; Ocean basins; Ocean floors; Oxidation; Oxides; Paleomagnetism; Petrology; Remanent magnetization; Stability; Thermomagnetic analysis; Titanomaghemite; Titanomagnetite; Vine; Viscous remanent magnetization; Volcanic rocks
Record ID: 1975007236
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

Similar Items