Terra Australis Orogen: Rodinia breakup and development of the Pacific and Iapetus margins of Gondwana during the Neoproterozoic and Paleozoic

摘要: Abstract The Pacific Ocean formed through Neoproterozoic rifting of Rodinia and despite a long history plate convergence, this ocean has never subsequently closed. record opening continental the inception convergence initiation subduction are preserved in to late Paleozoic Terra Australis Orogen. orogen had pre-dispersal length along Gondwana margin approximately 18,000 km was up 1600 wide. It incorporates Tasman, Ross Tuhua orogens Australia, Antarctica New Zealand, respectively, Cape Basin Southern Africa, orogenic elements Andean Cordillera South America. Orogen can be divided into series basement blocks either or oceanic character that further subdivided on basis pre-orogenic geographic affinity (Laurentian vs. Gondwanan) proximity inferred sequences (peri-Gondwanan intra-oceanic). These divisions reflect initial tectonic setting provide an insight time. have lain outboard both West East Laurentia within Rodinia. Subduction established at, close to, by around 570 Ma occurred at about same time as major global reorganization associated with final assembly Iapetus Ocean. termination 300–230 Pangea. is represented Pan-Pacific Gondwanide Orogeny marked east stepping out position boundary commencement classic Mesozoic been cited example declining stage Wilson cycle basins. However, its protracted ongoing absence any indication collisions contrasts clear evidence for closing oceans Iapetus/Atlantic Tethyan realms. other bound accretionary did not form cycle.