02646nmc a2200241 4500 20260520010450.0 260224s xxu 068.82 553.28 C62 15730 Simposio sobre la Exploración Offshore en el Sector Sur del Margen Atántico Sudamericano RIFTING MESOZOICO EN EL SUDOESTE DE GONDWANA: INFLUENCIA DEL RIFTING PRECEDENTE EN LA APERTURA DEL OCÉANO ATLÁNTICO SUR AUSTRAL 10/11/2023 ; 10/11/2023 30 p. ; 15-44 The opening of the South Atlantic in the Early Cretaceous was only the final stage of the complex rifting history of SW Gondwana. In this contribution we reassess the chronology of Mesozoic basin formation in southern South America and Africa and integrate it in the long-term breakup history of SW Gondwana. Triassic rifting is characterized by intracontinental rifting in Africa (Karoo I phase), and retro-arc extension on the SW-margin of Gondwana. In the Early Jurassic, the impingement of the Karoo plume triggered rifting on Eastern Africa, producing the Karoo II basins (and the Colorado and Salado basins on the Argentinean shelf). East Africa rifting ultimately produced the breakup of Eastern from Western Gondwana in the Middle Jurassic. In Patagonia, the Austral, Malvinas and other related basins formed in association with the synextensional emplacement of the Chon Aike magmatic province in the Patagonian retro-arc. In the Late Jurassic the Rocas Verdes back-arc basin opened in southern Patagonia, while oblique rifting in the core of the Late Paleozoic Gondwanides orogen produced the Outeniqua and Rawson/Valdés basins. The South Atlantic rift initiated in the Early Cretaceous associated with present-day E-W extension. rifting occurred diachronically from south to north, initiating in the previously thinned Rawson/Valdés- Outeniqua segment. A precursor oblique rift system and a larger degree of extension in this segment could explain the lack of SDRs south of the Colorado-Cape fracture zones. rifting and SDR emplacement occurred progressively to the north along different rift segments, producing strongly asymmetric conjugate margins. CONGTP Lovecchio, Juan Pablo 951 Rohais, Sebastien 952 Ramos, Víctor A. 953 Bolatti, Néstor 30198 Congreso de Exploración y Desarrollo de Hidrocarburos (11er : 2022 nov. 8 - 11 : Mendoza) 61064 196192 196192 https://biblioteca.iapg.org.ar/ArchivosAdjuntos/Conexplor2022/Simp.Explor.Offshore/offshore03.pdf 0 0 0 0 263911 BVIAPG BVIAPG 068.82 553.28 C62 15730 2026-03-06 200068610 0 068.82 553.28 C62 15730 200068610 2026-03-06 00:41:38 2026-03-06 ARCHIVO