info:eu-repo/semantics/publishedVersion
Plume Subduction Beneath the Neuquén Basin and the Last Mountain Building Stage of the Southern Central Andes
Fecha
2020Registro en:
Gianni, Guido Martin; Pesce, Agustina; García, Luciano Héctor; Lupari, Marianela Nadia; Correa Otto, Sebastian Ariel; et al.; Plume Subduction Beneath the Neuquén Basin and the Last Mountain Building Stage of the Southern Central Andes; Springer Nature Switzerland AG; 2020; 467-483
978-3-030-29679-7
CONICET Digital
CONICET
Autor
Gianni, Guido Martin
Pesce, Agustina
García, Luciano Héctor
Lupari, Marianela Nadia
Correa Otto, Sebastian Ariel
Nacif Suvire, Silvina Valeria
Folguera Telichevsky, Andres
Resumen
The occurrence of a Neogene shallow subduction stage, as well as, a Pliocene slab-tearing, and steepening of the Nazca plate in the southern Central Andes are well established. However, a satisfactory explanation for the origin and connection between these complex processes is still elusive. In this contribution, we revise the late Cenozoic tectonic and magmatic evolution of the southern Central Andes between 35° and 38° S and discuss different proposals for the Miocene slab shallowing and its Pliocene destabilization. Recent plate kinematic reconstructions show that Neogene arc-front expansion linked to slab shallowing, fold belt reactivation in the main cordillera and intraplate contraction in the San Rafael Block correlates with the subduction of the ancient Payenia plume, a deep mantle anomaly potentially rooted in the lower mantle. Also, the Nazca slab tear determined from tomographic analyses and subsequent slab steepening may also be a direct consequence of this plume subduction process. Considering the westward drift of South America and the presence of several neighbor hotspots over the Nazca plate, the Payenia plume overriding could be the first of future episodes of plume?trench interaction in the Andes.