Origin of the smooth zone in early Cretaceous North Atlantic magnetic anomalies

Details Origin of the smooth zone in early Cretaceous North Atlantic magnetic anomalies Origin of the smooth zone in early Cretaceous North Atlantic magnetic anomalies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3701304t&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 1, CiteID L01304

Physics

Geophysics

Geomagnetism And Paleomagnetism: Magnetic Anomalies: Modeling And Interpretation, Mineralogy And Petrology: Mid-Oceanic Ridge Processes (1032, 8416), Marine Geology And Geophysics: Marine Magnetics And Paleomagnetics (1550)

Scientific paper

Late Jurassic-Early Cretaceous marine magnetic anomalies observed in the North Atlantic exhibit an abrupt change in character in M5-M15 crust. The anomalies are smoother with low amplitudes, and are difficult to correlate among nearby profiles. The accepted explanation for the origin of this smooth zone is diminished resolution and anomaly interference due to slow spreading rates, which narrows the widths of polarity reversals in the crust and causes interference among sea-surface anomalies. Magnetic modeling of these anomalies indicates that neither slow spreading rates alone nor slow spreading rates in combination with a decrease in geomagnetic field intensity can explain the basic character of the smooth zone. Combined with other geophysical evidence, our study suggests that one consequence of slow spreading rates that is responsible for the magnetic “smooth zone” is a thinned crustal basalt layer or a non-basaltic magnetic source layer resulting from low melt supply during a period of ultra-slow spreading.

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