Paleomagnetism of the Cretaceous Morelos and Mezcala Formations, southern Mexico
作者： Roberto S Molina Garza , Harald N Böhnel , Teodoro Hernández
DOI: 10.1016/S0040-1951(02)00654-6
关键词:
摘要: A paleomagnetic study of platform-facies carbonate rocks the mid-Cretaceous Morelos Formation and deep-water overlying Upper Cretaceous Mezcala Formation, sampled at Zopilote canyon, in Guerrero State, southern Mexico, indicates that their characteristic magnetization was acquired contemporaneously with folding these during Late Laramide orogeny. The remanence carrier is interpreted to be magnetite, although other mineral phases high coercivity carry recent secondary overprints. overall mean Dec=323.1j Inc=36.5j (k=162.7; a95=2.7j; N=18 sites; 64% unfolding). Comparison North America reference direction this area has experienced a small, yet statistically significant, counterclockwise 19.2F4.0j. Similar rotations are documented localities from Mexico; linked mid-Tertiary deformation associated left-lateral strike-slip fault system accommodated motion Chortis Xolapa blocks. D 2002 Elsevier Science B.V. All rights reserved.
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