The global tectonic context of the ca. 2.27-1.96 Ga Birimian Orogen – Insights from comparative studies, with implications for supercontinent cycles

摘要: Abstract The evolution of orogenic systems is a function their overall tectonic context, and global reconstructions therefore provide crucial framework for understanding the geodynamic setting ancient orogens. However, reverse also true, as detailed model an system can valuable insights into its context. Based on recently proposed ca. 2.27-1.96 Ga accretionary-collisional Birimian Orogen in West African Craton, this study aims to explore broader setting, by placing events outlined orogen-scale within argues that formed plate similar which currently characterizes SE Asia, with forming wedge-shaped complex boundary zone, bordered north south continental blocks opening up face major oceanic basin. Neoproterozoic-Paleozoic East African-Antarctic orogen (EAAO) has been constrained have such exhibits significant similarities respect evolution. Furthermore, EAAO same temporal relationship environmental perturbations isotopic excursions Neo- Paleoproterozoic Eras, respectively, are generally considered be controlled tectonics. Building previous work, it argued reflection how Paleo- Neoproterozoic were characterized equivalent supercontinent cycle, where assumed position EAAO. This further requires during assembly Gondwana. line recognition 2.1-2.0 continent included Orogen, referred Atlantica. A revised configuration presented continent, includes crustal domains now present Africa, South America, Eastern Europe North China. Gondwana 1.0 breakup Rodinia 0.3 Pangea, cycle forms basis reconstruction Mesoproterozoic, places context Atlantica global-scale cycles. As they opportunity effect secular changes Proterozoic. since noted many Archean systems, may indicate latter zones, exist Asia.