TY - JOUR AU - Giambiagi, Laura AU - Bechis, Florencia AU - Lanés, Silvia AU - Tunik, Maisa A. AU - García, Victor AU - Suriano, Julieta AU - Mescua, José PY - 2008/12/30 Y2 - 2024/03/28 TI - Triassic-Jurassic development and evolution of the Atuel depocentre, Neuquén basin, Mendoza province JF - Revista de la Asociación Geológica Argentina JA - RAGA VL - 63 IS - 4 SE - DO - UR - https://revista.geologica.org.ar/raga/article/view/1313 SP - 520-533 AB - <p>The Atuel depocentre corresponds to a Late Triassic - Early Jurassic NNW-trending subbasin, located in the northern sector of the Neuquén basin. Based on pre-existing stratigraphical data and present structural analysis we propose that the Atuel depocentre is bounded by the presence of two NNW-trending major normal faults, named Alumbre and La Manga. These faults are inferred to have controlled the development of two west-facing half-grabens: the Río Blanco, a completely emerged half-graben, and the western Arroyo Malo, a completely submerged half-graben. The structural model presented here is based on the assumption that both, the basement structural grain and the regional extension direction, exerted a first-order control in the development and evolution of the Atuel depocentre. During the early stage of rifting (pre-Rhaetian - Middle Hettangian) the pre-Triassic Alumbre and La Manga faults reactivated in an oblique mode. During the second episode of rifting, both Alumbre and La Manga faults continued to play, while WNW-trending normal fault developed in order to accommodate the strain inside both half-grabens. The third extensional event began with an abrupt marine rise inside the Arroyo Malo half-graben during late Middle Hettangian, as a result of the last displacement of the Alumbre fault, and finished with an abrupt marine drop associated with the desactivation of the La Manga fault.</p> ER -