Did the Breakout of Laurentia Turn Gondwanaland Inside-Out?

Details Did the Breakout of Laurentia Turn Gondwanaland Inside-Out? Did the Breakout of Laurentia Turn Gondwanaland Inside-Out?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252.1409h&link_type=abstract

Science, Volume 252, Issue 5011, pp. 1409-1412

Computer Science

209

Scientific paper

Comparative geology suggests that the continents adjacent to northern, western, southern, and eastern Laurentia in the Late Proterozoic were Siberia, AustraliaAntarctica, southern Africa, and Amazonia-Baltica, respectively. Late Proterozoic fragmentation of the supercontinent centered on Laurentia would then have been followed by rapid fan-like collapse of the (present) southern continents and eventual consolidation of East and West Gondwanaland. In this scenario, a pole of rotation near the Weddell Sea would explain the observed dominance of wrench tectonics in (present) east-west trending Pan-African mobile belts and subduction-accretion tectonics in north-south trending belts. In the process of fragmentation, rifts originating in the interior of the Late Proterozoic supercontinent became the external margins of Paleozoic Gondwanaland; exterior margins of the Late Proterozoic supercontinent became landlocked within the interior of Gondwanaland.

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