CIRCULAR STRUCTURES OF BAJADA DEL DIABLO (ARGENTINA): GEOPHYSICAL SIGNATURES COMPATIBLE WITH AN IMPACT ORIGIN.

PREZZI, C.V.; ORGEIRA, MJ; MARTINEZ, OA; ACEVEDO, R.D.; PONCE, J. F.; GOLDMANN, GA; MAGNERES, I.; RABASSA, J

GEOPHYSICAL JOURNAL INTERNATIONAL

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2016 vol. 205 p. 876 - 899

0956-540X

ABSTRACT: Bajada del 2 Diablo is located in the Northern Patagonian Massif, Chubut, Argentina.3 The study area includes at least 66 circular structures found in Miocene olivine basalts of the4 Quiñelaf Eruptive Complex and in the Late Pliocene/Early Pleistocene Pampa Sastre5 conglomerates. An impact origin has been proposed for these circular structures. With the aim of6 further investigate the proposed impact origin, topographic, gravimetric, magnetic, resistivity,7 paleomagnetic and electromagnetic surveys in two circular structures (―8‖ and ―G‖) located in8 Pampa Sastre conglomerates and in basalts of the Quiñelaf Eruptive Complex were carried out.9 The new geophysical results support the hypothesis of an impact origin. However, the10 confirmation of such an origin through the findings of shock metamorphism evidences and/or the11 recovery of meteorites remains elusive.