Mathematics – Logic
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..171t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 2, p. 171-174
Mathematics
Logic
10
Geological Surveys, Lava, Magnetic Anomalies, Magnetization, Mid-Ocean Ridges, Ocean Bottom, Pacific Ocean, Volcanoes, Cooling, Demagnetization, Rock Intrusions
Scientific paper
Magnetic profiles obtained by deep submersible ALVIN across a newly erupted lava flow on the Juan de Fuca Ridge (JDFR) show strong magnetic anomaly fields (greater than 20,000 nT) and high crustal magnetization (greater than 50 A/m contrast) relative to the surrounding older lavas. These results are consistent with previous ideas that extrusive crust is initially highly magnetized. Within the high amplitude magnetic anomaly over the center of the flow, there is a clearly defined deep, 'notch-like' magnetic low. This notch may indicate thermal demagnetization associated with a subsurface feeder dike, weakly magnetized intrusives or altered extrusive rock. If the former mechanism is active, the notch should disappear with time as the dike cools.
Johnson Howard P.
Tivey Maurice A.
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