On the tectonic evolution of Mexico: Paleomagnetic constraints

Urrutia‐Fucugauchi, J.

doi:10.1029/gd012p0029

Cited by 24 publications

(12 citation statements)

References 57 publications

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“…The excellent agreement of our mean Oaxaca remagnetization pole with late Paleozoic (Kiaman Interval) paleomagnetic results from cratonic North America [12] would seem to indicate that the Oaxaca sedimentary rocks were remagnetized during the late Paleozoic. However, paleomagnetic data from post-Paleozoic rocks from other parts of Mexico reveal a complicated and as yet poorly understood history of tectonic rotations (real or apparent) and latitudinal displacements of the various Mexican terranes with respect to cratonic North America [13]. It is paradoxical that the Oaxaca pole we have obtained is in such good agreement with late Paleo-zoic poles from the craton, when younger Mexican rocks that lie closer to cratonic North America yield highly anomalous results [13].…”

Section: Discussionmentioning

confidence: 73%

“…However, paleomagnetic data from post-Paleozoic rocks from other parts of Mexico reveal a complicated and as yet poorly understood history of tectonic rotations (real or apparent) and latitudinal displacements of the various Mexican terranes with respect to cratonic North America [13]. It is paradoxical that the Oaxaca pole we have obtained is in such good agreement with late Paleo-zoic poles from the craton, when younger Mexican rocks that lie closer to cratonic North America yield highly anomalous results [13]. These considerations indicate that a late Paleozoic remagnetization cannot be tacitly assumed on the basis of the pole position: the agreement of the Oaxaca mean pole with late Paleozoic North American \.…”

Section: Discussionmentioning

confidence: 99%

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Late Paleozoic or early Mesozoic magnetizations in remagnetized Paleozoic rocks, State of Oaxaca, Mexico

McCabe¹,

Voo²,

Urrutia‐Fucugauchi³

1988

Earth and Planetary Science Letters

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Characteristics of the Oaxaca Terrane of southern Mexico suggest that the record of a complete Wilson cycle is present. The local basement is composed of high-grade rocks of the Oaxaca Complex, which is considered to have North American affinities based on Grenvillian lithologies and ages. In contrast, early Paleozoic sedimentary rocks in depositional contact with the Oaxaca Complex have very close faunal affinities with the Olenid-Ceratopygid trilobite province of Argentina. Late Paleozoic faunas indicate that by this time the Oaxaca Terrane was once again associated with North America. In an attempt to gain further insight into the drift history of this area, we have undertaken a paleomagnetic study of the Paleozoic sedimentary rocks of Oaxaca. The results of our study indicate that the entire Paleozoic section was remagnetized in the same paleomagnetic field at some time following late Paleozoic sedimentation, emplacement of an igneous complex, and the earlier of two folding events. Fold and conglomerate tests show that the remagnetization occurred prior to deposition and folding of overlying early Cretaceous sediments. The Oaxaca Paleozoic rocks were therefore remagnetized sometime between late Permian and early Cretaceous. Since the exact age of remagnetization is not known, we compare our result with data from cratonic North America for the bracketed range of magnetization ages. This analysis indicates that as much as 28 o of net counterclockwise rotation could have occurred between Oaxaca and cratonic North America subsequent to the Oaxaca remagnetization.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Late Paleozoic or early Mesozoic magnetizations in remagnetized Paleozoic rocks, State of Oaxaca, Mexico

McCabe¹,

Voo²,

Urrutia‐Fucugauchi³

1988

Earth and Planetary Science Letters

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“…Strike-slip megashear models have been suggested by several authors (e.g. De Cserna, 1970Urrutia-Fucugauchi, 1981, 1984Anderson and Schmidt, 1983;Bohnel, 1985). The age, sense and amount of lateral displacement vary from model to model, but a secondary plate-boundary is invoked in which some California-type, large, vertical-axis block rotations could be expected.…”

Section: Introductionmentioning

confidence: 98%

Palaeomagnetism of Late Miocene to Quaternary volcanics from the eastern segment of the Trans-Mexican Volcanic Belt

et al. 2000

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“…Paleomagnetic studies do not unequivocally support the existence of the Mojave-Sonora megashear (Urrutia-Fucugauchi, 1984;Kluger Cohen et al, 1986;Geissman, 1996, 1999).…”

Section: Introductionmentioning

confidence: 99%

The crust at northwestern Mexico interpreted from Magsat anomalies: Implications for the existence of the Mojave-Sonora megashear

Campos-Enríquez¹,

Hernández-Quintero²,

Lozada-Zumaeta³

2005

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

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In an effort to characterize the crustal structure of northwestern Mexico (and constrain the Mojave-Sonora megashear) we studied the Magsat magnetic anomalies from that area. Published anomaly maps covering this area include an extensive positive anomaly covering the southern United States, a positive anomaly over the southern half of the Baja California peninsula, and a magnetic low in between. We interpreted a magnetic profi le over these anomalies, focusing on its tectonostratigraphic terrane nature. The profi le was further constrained by crustal thicknesses from seismological studies and heat fl ow data. In our model the Cochimi terrane and the North American craton (Colorado Plateau and southern Basin and Range) are characterized by high magnetic susceptibility in agreement with the mafi c nature of their corresponding crusts. The Yuma and the Seri terranes have lower magnetic susceptibilities as expected from their felsic to basic crustal nature. The oceanic crust from the Gulf of California is modeled with a low magnetic susceptibility value due to the high heat fl ow observed at the extensional basins. Our model satisfi es the presence of a subvertical contact between crusts with contrasting magnetic signatures of the Seri terrane (comprising the Caborca subterrane) and the southwestern sector of the North American craton. The Mojave-Sonora megashear itself is below the resolution of the Magsat data. Nevertheless, our model implies that because of their different magnetic signatures, the crystalline basements from the southern United States and northern Mexico (Seri terrane) are of different nature, which does not support the continuity of the North American craton into northwestern Mexico.

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On the tectonic evolution of Mexico: Paleomagnetic constraints

Cited by 24 publications

References 57 publications

Late Paleozoic or early Mesozoic magnetizations in remagnetized Paleozoic rocks, State of Oaxaca, Mexico

Late Paleozoic or early Mesozoic magnetizations in remagnetized Paleozoic rocks, State of Oaxaca, Mexico

Palaeomagnetism of Late Miocene to Quaternary volcanics from the eastern segment of the Trans-Mexican Volcanic Belt

The crust at northwestern Mexico interpreted from Magsat anomalies: Implications for the existence of the Mojave-Sonora megashear

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