. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Figure 43. Crustal thickness profile of the Venezuelan conti- nental margin. Upper half: solid line = two-dimensional Bouguer anomaly profile; dashed line - regional Bouguer anomaly profile. Lower half: bathymetric profile and crust- mantle inter faces 3 as computed using three different density- contrast values. the mantle without any contribution from crustal and mantle density variations, a contour map can be prepared showing the depth below sea
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Figure 43. Crustal thickness profile of the Venezuelan conti- nental margin. Upper half: solid line = two-dimensional Bouguer anomaly profile; dashed line - regional Bouguer anomaly profile. Lower half: bathymetric profile and crust- mantle inter faces 3 as computed using three different density- contrast values. the mantle without any contribution from crustal and mantle density variations, a contour map can be prepared showing the depth below sea level to the top of the mantle (fig. 44). Based on the crustal section (fig. 43), the deviation of the Bouguer anomalies (fig. 31) from the regional Bouguer anomalies (fig. 32) can be expressed in terms of depth differences (from fig. 43, a 50 mgal change of the regional Bouguer anomaly equals to a 3 km change in depth). The mantle surface contours (fig. 44) north of 12°30'N are in close agreement with those made by Edgar (1968) on the basis of refraction profiles. The sharp northward curve of the depth contours north of Blanquilla Island probably reflects the eastward plunge of the mantle under the flank of the Aves Ridge. The mantle depth below the Blan- quilla platform is in agreement with the bathymetric data in that both suggest that the Blanquilla platform is a southwestern extension of the Aves Ridge. The 2 km depression indicated over the Curacao Ridge (fig. 44), the isolated high east of Tortuga Island, and the low in the western half of the Bay of Barcelona are probably not real, since geophysical measurements suggest that density changes within the crust cause the 718. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Lab
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