. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Plate Tectonics and Mineral Resources 49 180' 150* 120* 90* 60* 30*W. • PETROLEUM PRODUCING AREAS ONSHORE PETROLEUM POTENTIAL m OFFSHORE PETROLEUM POTENTIAL CRYSTALLINE ROCKS SEDIMENTARY ROCKS DIVERGENT PLATE BOUNDARY CONVERGENT PLATE BOUNDARY TRANSFORM PLATE BOUNDARY UNCERTAIN PLATE BOUNDARY FIG. 1-Areas of petroleum production and potential of Pacific region. Lithospheric plates and plate boundaries are shown. spreading about the East Pacific Rise
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Plate Tectonics and Mineral Resources 49 180' 150* 120* 90* 60* 30*W. • PETROLEUM PRODUCING AREAS ONSHORE PETROLEUM POTENTIAL m OFFSHORE PETROLEUM POTENTIAL CRYSTALLINE ROCKS SEDIMENTARY ROCKS DIVERGENT PLATE BOUNDARY CONVERGENT PLATE BOUNDARY TRANSFORM PLATE BOUNDARY UNCERTAIN PLATE BOUNDARY FIG. 1-Areas of petroleum production and potential of Pacific region. Lithospheric plates and plate boundaries are shown. spreading about the East Pacific Rise decreases to about cm/yr. Oceanic and continental crust are juxtaposed at convergent plate boundaries in the eastern Pa- cific (Fig. 1). Marginal basins generally underlain by oceanic crust intervene between convergent Table 1. Seafloor-Spreading Half-Rates about Pacific Oceanic Ridges Latitude Longitude Half-spreading Location rate (+North, (+East, (cm/yr) -South) - West) -129 Juan de Fuca Ridge 1-2 Gorda Rise East Pacific Rise -102 East Pacific Rise - Galapagos rift zone - Galapagos riff zoneJ - Galapagos rift zone - East Pacific Rise 7-5 East Pacific Rise -19 -113 East Pacific RiseJ -28 -112 8-10 East Pacific Rise East Pacific Rise - Chile Ridge3 'Vine and Wilson, 1965. JAtwater and Mudie, 1973. *Herron, 1972. plate boundaries and continental crust in the western Pacific. The development of marginal ba- sins may be related to the dip of Benioff zones (Oxburgh and Turcotte, 1971; Karig, 1971; Sleep and Toksoz, 1971; Bracey and Ogden, 1972). Where the marginal basins are present in the western Pacific, the dip of the Benioff zone ex- ceeds about 35°; where marginal basins are ab- sent in the eastern Pacific, the dip is less than about 35° (Table 3). Ages of Seafloor and Continents The age of the Pacific seafloor, as dete
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