Mathematics – Logic
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..189d&link_type=abstract
(Royal Society, Discussion on the Origin and Evaluation of the Earth's Continental Crust, London, England, Feb. 21, 22, 1980.) R
Mathematics
Logic
59
Earth Crust, Planetary Evolution, Plates (Tectonics), Structural Properties (Geology), Continental Drift, Cratons, Secular Variations
Scientific paper
Declining radiogenic heat production since the Archaean has resulted in a secular evolution from a regime of numerous fast-moving small thin torsionally weak plates to the present regime of larger thicker torsionally stronger plates moving at an average rate of less than one-sixth of the Archaean rate; this has been accompanied by episodic changes in geological effects. By 2500 Ma B.P., about 85% of the present crustal mass had grown by the addition and amalgamation of mafic and calc-alkaline rocks in oceanic arcs at an average rate of 11.17 Pg/a. During the early Proterozoic, the first large cratons were stabilized and, locally, thickened and differentiated; the Proterozoic was an era of little continential growth, falling average sea level, and intracontinental deformation. By 700 Ma B.P. cratons had become much more stable, marginal accretionary terrains had begun to develop with an average Phanerozoic growth rate of 1.64 Pg/a, and blueschists and ophiolites sensu stricto witness the advent of the extant plate tectonic regime.
Dewey John F.
Windley Brain F.
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