Paleoproterozoic thermotectogenesis: A rotation-plume model of the formation of the Aldan Shield

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

“…The content of CO 2 in the atmosphere increased, and numerous greenschist series, etc., appeared. The vertical growth of continental crust terminated in the Paleoproterozoic (Abbott and Isley, 2002a,b;Bogatikov et al, 2010;Condie, 1998Condie, , 2002Condie et al, 2001;Glukhovskii, 1990;Glukhovsky, 2009;Kumazava et al, 1994;Markov and Fedorovskii, 1986;Mitrofanov, 2009;Mitrofanov and Bayanova, 2013;Pirajno, 2002Pirajno, , 2007Sharkov, 2004;Sorokhtin and Ushakov, 1991).…”

“…The time from 2.7 to 1.7 Ga coincided with the subsequent mass asteroid bombardment of the Earth and with a catastrophic increase in the Moon-Earth distance (from 29 ± 2 to 50 ± 3 Earth's radii) at 2.0 ± 0.4 Ga. All that reduced the velocity of the planet's axial rotation. That was the era of processes of thermotectogenesis related to mantle plumes, which were superposed on the consolidated older structure of the Earth (Glukhovsky, 2009). That time was characterized by widespread rifting and emplacement of high-Mg mafic dikes and layered ultramafic-mafic intrusions with related ore systems.…”

“…In the Dzhugdzhur-Stanovoi zone, the formation of a system of arc thrusts with frontal zones of high-pressure granulites (Fig. 8) is related to this process (Glukhovsky, 2009). …”

“…5. Fold structure of the Archean gneiss series of the Aldan Shield in the Seimdzhe River basin (Glukhovsky, 2009). See the position of the zone in Fig.…”

“…Unlike the other Paleoarchean granitegreenstone zones in the Aldan Shield, these rocks of both complexes experienced granulitic-facies metamorphism during Paleoproterozoic thermotectogenesis with the conservation of the initial folds (Fig. 5) (Glukhovsky, 2009).…”