. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 70° N. 70° S Diamondiferous kimberlites Alluvial diamonds Sn Tin Belts Pegmatite (Be,Ta,Nb) © Fe, Mn ^M Au X A Tungsten w Fig. 4. Mineral provinces shown on the continents [Schuiling, 1967; Petrascheck. 19731 in reconstructed positions during the Triassic period (220 ± 20 my. ; see Smith et at. (1973)) prior to continental separation. the TAG Hyclrothermal Field by the Famous project (Figure 2; see also ArcijiiiKi 1197511. An active hyd
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 70° N. 70° S Diamondiferous kimberlites Alluvial diamonds Sn Tin Belts Pegmatite (Be,Ta,Nb) © Fe, Mn ^M Au X A Tungsten w Fig. 4. Mineral provinces shown on the continents [Schuiling, 1967; Petrascheck. 19731 in reconstructed positions during the Triassic period (220 ± 20 my. ; see Smith et at. (1973)) prior to continental separation. the TAG Hyclrothermal Field by the Famous project (Figure 2; see also ArcijiiiKi 1197511. An active hydro- thermal field at the Galapagos spread- ing center in the eastern equatorial Pacific was investigated in recent dives by the deep submergence research vehicle Atrin \Cnrlisft tt n\.. 197f); HV/. tV .(/.. 19TGI. Once formed at a divergent plate boundary, the hydrothermal metal de- posits are moved away from the boundary by sea floor spreading. The distribution of hydrothermal mineral deposits in oceanic crust is presently unknown. Knowledge of hydrothermal ore forming processes at divergent plate boundaries is helping to guide for metal deposits in oceanic crust exposed on land where accessible to immediate exploitation (Figure 1. to be considered with I'efer- ence to closing ocean basins> and in oceanic crust submerged beneath ocean basins where some deposits may eventually become exploitable. Eval- uation of the metallic mineral poten- tial of oceanic crust which covers two thirds of the earth is contingent on the results of this exploration on land and at sea. Rittnl Cot,l,„,>'t,il Mnnml Pn,rn,r,s Two distinct situations relevant to the occurrence of mineral resources exist when a continent rifts apart and an intervening ocean basin uiiens in response to sea floor spreading ahuut a divergent plate boundary. In the first situation, already considered, metal deposits are concentrated in oceanic crust by hydrothermal pro- cesses at the divergent pl
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