Paleomagnetism of Permo-Triassic and Cretaceous rocks from the Antofagasta region, northern Chile

K. Narea (1) , M. Pena (1) , S. Bascunan (1) , J. Becerra (1) , I. Gomez (1) , K. Deckart* (1) , F. Munizaga (1) , V. Maksaev (1) , Cesar Arriagada (1) , Pierrick Roperch (2)

1 UCHILE - Universidad de Chile = University of Chile [Santiago]
2 GR - Géosciences Rennes

New paleomagnetic data from Permo-Triassic and Late Cretaceous rocks yield a consistent trend of vertical-axis-tectonic-rotations which are consistent with the Central Andean Rotation Pattern (CARP). However, three sites in the Tuina Formation and one site in the Purilactis Group record large rotations (80°). These mayor rotations are probably due to dextral-transpressive deformation occurring in close relation with the Incaic tectonic phase. Consequently, it is possible to infer that previous tectonic phases Peruvian and K-T would not have produced significant tectonic rotations in the area.

Domaines: Géophysique [physics.geo-ph]; Stratigraphie

K. Narea, M. Pena, S. Bascunan, J. Becerra, I. Gomez, et al.. Paleomagnetism of Permo-Triassic and Cretaceous rocks from the Antofagasta region, northern Chile. Journal of South American Earth Sciences, 2015, 64, pp.261-272. ⟨10.1016/j.jsames.2015.09.008⟩. ⟨insu-02440221⟩