Journal
GONDWANA RESEARCH
Volume 15, Issue 3-4, Pages 373-380Publisher
ELSEVIER
DOI: 10.1016/j.gr.2008.06.008
Keywords
Supercontinent; Tectonics; Life evolution; Surface processes; Columbia
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Assembly of the supercontinent Columbia at about 1.85-1.90 Ga coincided with several events that affected the entire earth. The oldest worldwide network of orogenic belts formed at the same time. Although some granite-granodiorite (GG) Suites had formed earlier, the GG suites became common in the 1.8-1.9 Ga orogenic belts. These suites succeeded the older tonalite-trondhjemite-granodiorite (TTG) suites, which were not produced after 1.8 Ga. Changes on the earth's surface at 1.8-1.9 Ga include rapid increase in the concentration of oxygen in the atmosphere and oceans and probably the evolution of eukaryotes. All of these surface changes occurred as Columbia accreted, and the assembly of Columbia may have contributed to the drastic changes in the earth's surface environment as well as to the evolution of primitive life forms. (C) 2008 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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