Physics – Geophysics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..423a&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 3, p. 423-426
Physics
Geophysics
10
Geomagnetism And Paleomagnetism, Marine Geology And Geophysics: Geomagnetism, Seismology: Oceanic Crust
Scientific paper
A newly developed rock drill was used to take the first fully oriented samples from in-situ gabbros exposed on Atlantis Bank, which formed 11 m.y. ago on the Southwest Indian Ridge (SWIR). These paleomagnetic data locate the seabed outcrop of a normal polarity magnetic lineation within an outcrop of lower crust that correlates with overlying deeptowed and sea-surface magnetic field measurements. A systematic lateral offset between the seabed boundary and measured anomalies implies that the reversal boundary dips ~25° to the south, away from the ridge axis. Paleomagnetic results suggest that following magnetization acquisition, the platform tilted south by ~20° (range: 33 south° to 7° north), implying an original reversal boundary dip of only ~5°.
Allerton Simon
Tivey Maurice A.
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