Magnetic inclination of basaltic lavas from the Mid-Atlantic Ridge near 37° N

Paleomagnetism of Basalts from ODP Hole 648B on the Mid-Atlantic Ridge

“…Two of the nine oriented samples (with respect to the vertical) gave negative inclina tions (one of which with three cooling levels). However, Prevot et al (1976) reported no negative inclination amongst their 18 oriented samples from FAMOUS area; the mean value of inclination corresponds well to that of the present geomagnetic field at the site. The criterion used by them was in most cases, the occurrence of frozen-in lava levels resulting in the formation of ledges assumed to be horizontal.…”

Paleomagnetism and Some Magnetic Properties of Basalts from the Bermuda Triangle

“…One of the more significant facts which has emerged is that these rocks often have very different magnetic properties from those inferred from studies of magnetic anomalies near spreading centers (Talwani et al, 1971;Atwater and Mudie, 1973;and Klitgord et al, 1975), or from rock magnetic studies of oceanic extrusives dredged near spreading centers Carmichael, 1970;Prévot et al, 1976;and Johnson and Atwater, 1977). Although Lowrie (1977) noted that the paleoinclinations of basalts from early DSDP sites are consistent with the paleolatitudes of the sites (correlation coefficient = 0.912), the results of many studies show that the stable inclinations are often anomalous (usually shallow) relative to those expected from a geocentric axial dipole field (Cox and Doell, 1962;Brooke et al, 1970;Lowrie andOpdyke, 1972, 1973;Ade-Hall et al, 1973;and Ryall and Hall, 1977).…”

Paleomagnetism of Basalts and Interlayered Sediments Drilled during DSDP Leg 49 (N–S Transect of the Northern Mid-Atlantic Ridge)

“…At Holes 407 and 409 a steep, unstable normal component was often removed early in the demagnetization process. Such a component, which may be induced by drilling or may arise from partial remagnetization in the earth's present field, has been observed at previous drill sites (Prevot et al, 1976;Ryall et al, 1977). There is no evidence for this component at Hole 408 or at the lower latitude sites.…”

“…Prevot et al (1976) and Johnson and Atwater (1977) also report agreement between the inclinations of oriented samples from FAMOUS and the predicted value, but Ryall et al (1977) find that shallow inclinations predominate down Holes 332 and 333 of Leg 37. Lowrie (1977) shows that there is no overall tendency for DSDP basalt inclinations to be systematically shallow or steep, although discrepancies often occur between predicted and observed inclinations.…”