Structural and seismographic characteristics of a sector of the Magdalena Shelf, western margin of Baja California, Mexico, from 2D seismic reflection profiles
The Magdalena Shelf, located on the Pacific margin of Baja California, Mexico, is crosscut by the Tosco-Abreojos transform fault system, while the Santa Margarita and San Lazaro faults are sub-parallel and located east of the shear zone that cuts the continental slope longitudinally. Processing an...
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| 其他作者: | , |
| 格式: | Artículo |
| 语言: | English |
| 出版: |
2021
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| 主题: | |
| 在线阅读: | https://doi.org/10.1007/s00367-021-00697-5 https://link.springer.com/article/10.1007/s00367-021-00697-5#Abs1 |
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| 总结: | The Magdalena Shelf, located on the Pacific margin of Baja California, Mexico, is crosscut by the Tosco-Abreojos transform
fault system, while the Santa Margarita and San Lazaro faults are sub-parallel and located east of the shear zone that cuts
the continental slope longitudinally. Processing and interpretation 2D multichannel marine reflection seismic data show
evidence for the structural deformation and seismostratigraphic characteristics of a sector of the shelf. This study allowed
mapping unknown faults, of which the two main ones are named Iray and Magdalena Faults. San Lazaro fault has a strike
of N 15° W and length of 70 km, with an apparent dip of ~ 42° to the NE. The San Lazaro fault controls the western flank
of the basin of the same name forming a semi-graben of 20 km wide and its sedimentary fill of ~ 4.5 km in thickness. The
Iray-Magdalena basin has a depth of~4.0 km. We identified six seismic stratigraphic sequences, and two main discordances,
which are considered to be regional discordances. One of which is the Cretaceous-Paleogene discordance, and the other
corresponds to the Miocene discordance, which has been considered an important geological marker of the tectonic evolution of region. Acoustic basement defines a structural high parallel to the continental slope and aligned with outcrops of the
ophiolite complex. The zone of active deformation of the Tosco-Abreojos fault system is between 15 and 18 km wide. This
region may contain previously unknown structures and can represent a geological/seismic risk, which can have not only
scientific implications, but also social impact in the communities of the region. |
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