Evolution of earth crust in course of tectogenesis |
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| Abstract: | Recent and detailed seismic studies in the U.S.S.R. have provided much information on the structure and revolution of the earth's crust. A review of this information indicates the following postulates: a) the thickness and constitution oft he crystalline layers (”basalt“ and ”granite“) change comparatively rapidly in Alpine provinces of pronounced tectonic movements (geosynclinal provinces and mobile zones), with but a slight lag behind these movements. b) Under platform areas, the crystalline complexes rebuild slowly with a lag of a few geologic periods behind the emergence of the structural elements. c) In both geosynclinal and platform areas the downwarping of the major segments is accompanied by an upward movement of the Mohorovi?i? surface. d) Block uplifts in geosynclinal provinces of mobile zones have absolute values, while in platform areas the uplifts usually represent blocks lagging behind their neighbors. e) Changes in thickness and composition of deeper layers within the crust usually lag behind the formation of corresponding structural elements. — J. R. Hayes |
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