Mathematics – Logic
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..103z&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 1, June 1985, p. 103-116.
Mathematics
Logic
15
Geological Surveys, Oceans, Paleomagnetism, Thematic Mapping, Volcanoes, Asia, Europe, North America, Reconstruction, Siberia
Scientific paper
A set of global reconstruction maps is developed to show the motions of continents during Paleozoic times. The maps are based on the orientation of three intraplate magmatic belts: the Mongolian (from 130 to 280 m.y.); South Siberian (from 320 to 400 m.y.); and the Baltic (from 365 to 400 m.y.) belts. The absolute motions of the continents were used together with the apparent paleomagnetic pole wander paths to compute the parameters of finite rotation for six time episodes from 220 to 520 m.y. The reconstructions obtained show that the old, Late Precambrian Pangea continued to exist in the Early Paleozoic with an inner arrangement of constituent continents strongly different from that of the Late Paleozoic Pangea. The continents were located in the Eastern Hemisphere only. A total of four oceans were found in the Paleozoic period in the Eastern Hemisphere: (1) the Iapetus which originated in the Late Precambrian and closed before Devonian times; (2) the Asiatic paleoocean which originated in the Late Precambrian and closed 450 m.y. ago; (3) the Uralian paleoocean which opened around 500 m.y. ago and closed in the latest Permian (240-230 m.y.); and (4) the Paleo-Tethys which opened around 500 m.y. ago and closed in the latest Permian in the Ordovician (480-450) and became the Mesozoic Tethys. Computer reproductions of the maps are provided.
Kononov M. V.
Kuzmin Mikhail I.
Zonenshain Lev Pavlovich
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