Paleomagnetism and rock magnetism of Fernando de Noronha, Brazil

Schultz, Arthur P.; Calvo‐Rathert, Manuel; Guerreiro, S.D.C.; Bloch, W.

doi:10.1016/0012-821x(86)90054-3

Cited by 10 publications

(1 citation statement)

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“…Relative to the 20 Ma reference pole (Table 3), which is the average time spanned by the Ipururo and Chambira formations, no significant rotation is recorded (+0.6 ± 5.1). The Ipururo and Chambira pole (84.7°S, 306.6°E, A 95 = 5.9°) is virtually identical to the reference pole and with the 5 to 24 Ma reference pole from Randall [1998] (85°S, 310°E, A 95 = 5°) and the sole late Miocene pole available for stable South America (85°S, 316°E, A 95 = 8°) [ Schultz et al , 1986]. This means that late Miocene to Present folding and thrusting in the Tarapoto region did not involve vertical axis block rotation and thus the Tarapoto pole can be considered as a reference South American pole for the late Oligocene to earliest Pliocene.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Paleomagnetic tracking of mountain building in the Peruvian Andes since 10 Ma

et al. 2003

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We report paleomagnetic data from 73 sites (628 samples) of upper Oligocene to Pliocene rocks from central and northern Peru. The data indicate that the Subandean Zone has not experienced vertical axis rotation since the upper Oligocene, whereas the coast and the Western Cordillera record a coherent pattern of counterclockwise rotations emplaced in the last 10 Ma. This pattern can best be explained by two competing hypotheses: (1) a propagation in rotations from the Bolivian Orocline toward the north or (2) a more punctual and widespread event linked to subduction of the Nazca Ridge that caused the rotations. On the basis of the time‐space relationship of paleomagnetic rotations, deformation, magmatism and Nazca‐South America plate convergence, the latter appears more likely. Moreover, because the rotations north of the Abancay deflection (∼15.5°S) are synchronous with deformation and exhumation, they indicate that major mountain building in the Peruvian Andes has occurred since 10 Ma. Finally, we suggest that a succession of aseismic ridge subduction events played an important role in shaping the modern topography of the Andean chain.

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Section: Interpretation and Discussionmentioning

confidence: 99%