. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Southwestern North Atlantic and Barbados Ridge 1089. i i i_ .. .. i_30__i25 i20_Jli_> _f_ }_ 30 25 20 13 6 5 ! 5 t_ t_ J I t / ( \ l3^_l2L _J!° J_ ; I i [30 }25 " |20 fa |6 I5 f' i l i i i i i i i i i i_ VEMA F Z 16° 14° 12° 10° 60° 58" 56° 54° 52° 50° 48° 46° 44° 42° 40° Fig. 11—Identification and offset pattern of magnetic-anomaly lineations east of Lesser Antilles arc. Anomaly numbers are after Pitman et al (1968). Anomaly no. 1 i
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Southwestern North Atlantic and Barbados Ridge 1089. i i i_ .. .. i_30__i25 i20_Jli_> _f_ }_ 30 25 20 13 6 5 ! 5 t_ t_ J I t / ( \ l3^_l2L _J!° J_ ; I i [30 }25 " |20 fa |6 I5 f' i l i i i i i i i i i i_ VEMA F Z 16° 14° 12° 10° 60° 58" 56° 54° 52° 50° 48° 46° 44° 42° 40° Fig. 11—Identification and offset pattern of magnetic-anomaly lineations east of Lesser Antilles arc. Anomaly numbers are after Pitman et al (1968). Anomaly no. 1 is over axis of Mid-Atlantic Ridge. Tertiary, Quaternary turbidites (Damuth and Fairbridge, 1970; Embley et al, 1970). The block south of 12°54'N appears to be an exception, be- cause here the transparent zone is overlain by a sedimentary unit approximately 1,000 m thick (intermediate turbidite unit) characterized by strong incoherent reflections and by three or four weak reflecting horizons, which locally fade into the incoherent zone. From 12°20'N southward this unit is overlain by strongly stratified se- quence of late Tertiary-Quaternary turbidites. Whereas normal, reverse, and thrust faults commonly can be recognized on seismic records run normal to the trends of these faults, strike-slip motion cannot be established on the basis of these records alone. The studies of Currey and Nason (1967) of the seaward extension of the San Andreas fault revealed that a zone of chaotic re- flections, abruptly terminating coherent reflecting horizons, can be expected in a strike-slip fault zone. This zone also may involve complementary normal faulting. From these observations and the fact that some of the faults on Figure 17 lie at the ~T~V t -i500 400 300 200 100 0 300 Km Fig. 12—Magnetic-anomaly profiles 41 and 70 showing correlation across Vema fracture zone. westward extension of magnetic-offset zones, the apparent normal faults centered on 15°15'N and 14°38'N,
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