On some results of the Earth's contraction from cooling; Part V, Formation of the continental plateaus and oceanic depressions

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1873
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Abstract
IN my papers of 1846 and 1847, I attributed the formation of the great plateaus, called continents, and of the oceanic depressions, to unequal contraction, observing that the oceanic crust, by being the later in consolidation, became more depressed through the continued contraction than the already firm or less-contracting continental crust.The steps in the process I propose now to consider, as a means of further elucidating the subject.1. Unequal contraction a fact.The fact of unequal contraction is manifest from the inequality of level that exists over the sphere dividing it into oceanic depressions and continental plateaus; and unequal contraction, the material of the crust being essentially the same over the two kinds of regions, implies an unequal rate of cooling.Moreover, it is a necessary conclusion that the great areas first consolidating should have been first free from that chemical activity, and those ebullition-like movements due to escaping vapors, which are inseparable from the fluid condition of rocks uuder merely atmospheric pressure.. Location of the continental areas.The areas first to become quiet, and first to cool and consolidate, would have been the shallowest areas, that is, those be-
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Authors J. D. Dana
Journal american journal of science
Year 1873
DOI
10.2475/ajs.s3-6.33.161
URL
https://doi.org/10.2475/ajs.s3-6.33.161
Keywords Keywords not found

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