. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography BASE METAL DEPOSITS 120°E 150° 180" 150° 120" 90° 60° 30"W. * ANTIMONY • COPPER ' LEAD d MERCURY " TIN o ZINC * * * 0 CONVERGENT PLATE BOUNDARY .DIVERGENT PLATE BOUNDARY Fig. 8. Map of base-metal deposits of the Pacific region (adapted from Rona and Neuman, 1974, 1975). Lithospheric plate boundaries are shown. related to the occurrence of particular minerals in granitic rocks and to the concentration of these minerals by processe
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography BASE METAL DEPOSITS 120°E 150° 180" 150° 120" 90° 60° 30"W. * ANTIMONY • COPPER ' LEAD d MERCURY " TIN o ZINC * * * 0 CONVERGENT PLATE BOUNDARY .DIVERGENT PLATE BOUNDARY Fig. 8. Map of base-metal deposits of the Pacific region (adapted from Rona and Neuman, 1974, 1975). Lithospheric plate boundaries are shown. related to the occurrence of particular minerals in granitic rocks and to the concentration of these minerals by processes of subaerial weathering. Base-metal deposits including antimony, copper, lead, mercury, tin, and zinc are distributed along convergent plate boundaries around the Pacific Ocean (Fig. 8), similar to the distribution of precious metal deposits (Fig. 6). The base-metal deposits occur landward of convergent plate boundaries along the western margins of the Americas in the eastern Pacific, and on is- land arcs along convergent plate boundaries of the western Pacific. In south- east Asia deposits of tin associated with tungsten, fluorite, bismuth, and molybdenum occur in belts of granites of predominantly Mesozoic age (70,000,000-200,000,000 years ago). Base-metal deposits also occur in east- ern Asia and Australia where they are separated by a gap from active conver- gent plate boundaries. The copper occurs associated with other metals along convergent plate boundaries of the Pacific region in two economically important classes of ore deposits — massive statiform sulfide bodies and porphyry ore bodies. 69 410. 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 Laboratories; United States. Environmental Science Services Administr
Size: 1678px × 1490px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookcollectionamericana, bookleafnumber430
