. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Both the free-air (fig. 30) and the residual Bouguer (fig. 41) anomaly maps indicate that the major bulk of the sediments of the Curacao Ridge (Edgar, 1968) lies west of 65°30'W. The northward swing of the Bouguer anomaly isogal lines (fig. 31) northwest of Blanquilla may be attributed to the eastward plunge of the mantle under the flank of the Aves Ridge. Crustal Structure of the Venezuelan Continental Margin Evidence from Seismic Refract
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Both the free-air (fig. 30) and the residual Bouguer (fig. 41) anomaly maps indicate that the major bulk of the sediments of the Curacao Ridge (Edgar, 1968) lies west of 65°30'W. The northward swing of the Bouguer anomaly isogal lines (fig. 31) northwest of Blanquilla may be attributed to the eastward plunge of the mantle under the flank of the Aves Ridge. Crustal Structure of the Venezuelan Continental Margin Evidence from Seismic Refraction Data Refraction data in the area of the Venezuelan continental margin exhibit a large variation of seismic velocities (Edgar, 1968). Measure- ments in the Venezuelan Basin indicate a km/sec velocity for the sediments above A" and km/sec velocity for the sediments between A" and B". The velocity of the turbidites in the Bonaire Basin and else- where on the continental margin falls in the - km/sec range. A layer of sediments with a velocity range of - km/sec underlies the low velocity sediments of the Venezuelan Basin and forms the bulk of the sediments under the Curacao Ridge (fig. 42). The large negative gravity anomalies could, in large part, be attributed to these sediments on the Curacao Ridge. The presence of 5 km thick, combined low and high velocity sediments north of the Blanquilla platform (Edgar, 1968) can explain the gravity minimum in that area. In the area of the island platforms the seismic velocities of the rocks underlying the surface sediments range between - km/sec, which is expected for the "granitic" rocks that were dredged on the Blanquilla platform, and were indicated under the platforms by the mag- netic, gravity, and seismic reflection data. CURACAO LOS ROOUES RIDGE TRENCH 68,69,70,71 BONAIRE VENEZUELA^ TRENCH b 72 I 73 E - 10. -15 - 20 HORIZONTAL SCALE Figure 42. Composite seismic refraction s
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