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Isostasy implies that the differences in surface elevation of continents and ocean basins must reflect differences in density that in turn imply gross lithologic contrasts between these crustal segments. Some petrologists infer that tholeiites and magmas more siliceous are wholly continental. Oceanic rocks, collected from islands, may not fairly represent the oceanic crust, but at any rate they do not differ sharply from continental rocks. All major magma types occur; the Hawaiian magmas are saturated, for instance. Quartzose rocks seem confined to islands that rise from high ridges, but such rocks are sufficiently abundant to suggest that most high ridges are partly sialic. Probably the deeper oceanic basins are essentially free from sial. The secular loss of sialic material to the pelagic areas requires that the continents should be either lower or smaller than in the past, unless there has been concurrent addition to the sial from the mantle. A rough computation, based on Arrhenius' studies of deep-sea cores, suggests a loss of 1.5 km of material from the continents during 2 billion years. The fact that the continents seem as large or larger than in early geologic history sugges

Author

F.L. Schwab

Publisher

Wiley, John & Sons, Incorporated

Published

1982

Language

EN

ISBN

9780879334109

Subjects

Science, Stem