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Columbia (Nuna) supercontinent with external subduction girdle and concentric accretionary, collisional and intracontinental orogens permeated by large igneous provinces and rifts
Precambrian Research ( IF 4.427 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.precamres.2020.106017
Alexandre de Oliveira Chaves

There is some consensus that two end-member processes are responsible by emergence of supercontinents: introversion (when the interior smaller ocean developed between dispersing portions of the previous supercontinent is preferentially subducted) and extroversion (when the exterior superocean surrounding the supercontinent is preferentially subducted). In agreement with the coupled supercontinent-superplume cycle driven by mantle superdownwellings (slab avalanches) and superupwellings (superplumes), the extroversion assembly for Columbia (Nuna) supercontinent is here reinforced and is supported on its probable external subduction convergent girdle and concentric accretionary (1.80-1.90 Ga), collisional (1.95-2.10 Ga) and compressional intracontinental (1.80-1.90 Ga) orogens permeated by large igneous provinces and rifts. The distribution of these geological entities would have shaped a singular Columbia (Nuna) paleogeography.

更新日期:2020-11-21
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