PALEOMAGNETIC STUDY OF THE LATE MIOCENE LAS ARCAS FORMATION, PAMPEAN RANGES, NORTHWESTERN ARGENTINA

LUCÍA I. DOMÍNGUEZ; CECILIA M. SPAGNUOLO; SERGIO M. GEORGIEFF; LUCÍA M. IBAÑEZ

LatinMag Letters

Latin American Association of Paleomagnetism and Geomagnetism

Lugar: México; Año: 2013 vol. 3 p. 1 - 5

A paleomagnetic study was carried out in the Late Miocene Las Arcas Formation of northwestern Pampean Ranges (26° 45.757? S, 66° 2.189? W) in order to contribute with paleomagnetic information to the knowledge of the deformation of the area. The sampled formation is composed of fluvial red sandstones and pelites that were recently dated, near the top, in 6.88 My (Georgieff et al. 2013). It was sampled a stratigraphic section of 340 m thick from bottom to top of the unit. Of 17 sites analyzed, 14 carried a primary magnetization that was used to calculate a paleomagnetic pole (D = 176.2°, I = 34.0°, A95 = 6.9°) that indicates a rotation of 0.3° ± 5.8°. This result suggests that the area did not undergo rotation since Late Miocene.