Origin of magnetic viscosity and estimate of long-term induced magnetization in coarse-grained submarine basalts

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doi: 10.1029/93GL02472
Author(s): Prévot, Michel; Bina, M. Mansour
Author Affiliation(s): Primary:
Universite Montpellier II, Centre Geologique et Geophysique, Montpelier, France
Université Paris VI, France
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 20(22), p.2483-2486. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 22 refs.; illus., incl. 1 table
Summary: The characteristics of magnetic viscosity and susceptibility disaccommodation of a submarine basalt containing multidomain (MD) titanium-rich titanomagnetite are found to be quite dissimilar at room temperature. Thus, the viscous induced magnetization (VIM) of submarine basalts in situ is not due to diffusion but to thermal fluctuations. Experiments above room temperature show that a linear log t extrapolation of laboratory measurements at room temperature yields an underestimate of the Brunhes VIM. A theoretical calculation of this projected VIM is difficult because of the thermal dependence of the activation volume of barriers in MD low-Curie point minerals. Copyright 1993 by the American Geophysical Union.
Year of Publication: 1993
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 17 Geophysics, General; Basalts; Brunhes Chron; Cenozoic; Curie point; DSDP Site 474; Deep Sea Drilling Project; East Pacific; Gulf of California; IPOD; Igneous rocks; Induced magnetization; Leg 64; Magnetic domains; Magnetic susceptibility; Magnetization; Marine environment; Metals; Multidomains; North Pacific; Northeast Pacific; Oxides; Pacific Ocean; Paleomagnetism; Quaternary; Remanent magnetization; Submarine environment; Temperature; Textures; Titanium; Titanomagnetite; Upper Quaternary; Viscosity; Viscous remanent magnetization; Volcanic rocks
Coordinates: N225743 N225743 W1085851 W1085851
Record ID: 1995048647
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.