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Architecture and tectonostratigraphic evolution of the Pescadero Basin Complex, southern Gulf of California: Analysis of high-resolution bathymetry data and seismic reflection profiles

Authors

Ramírez-Zerpa,  Néstor
External Organizations;

Spelz,  Ronald M.
External Organizations;

Yarbuh,  Ismael
External Organizations;

Negrete-Aranda,  Raquel
External Organizations;

Contreras,  Juan
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Clague,  David A.
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/persons/resource/fneu

Neumann,  Florian
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Caress,  David W.
External Organizations;

Zierenberg,  Robert
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González-Fernández,  Antonio
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Citation

Ramírez-Zerpa, N., Spelz, R. M., Yarbuh, I., Negrete-Aranda, R., Contreras, J., Clague, D. A., Neumann, F., Caress, D. W., Zierenberg, R., González-Fernández, A. (2022): Architecture and tectonostratigraphic evolution of the Pescadero Basin Complex, southern Gulf of California: Analysis of high-resolution bathymetry data and seismic reflection profiles. - Journal of South American Earth Sciences, 114, 103678.
https://doi.org/10.1016/j.jsames.2021.103678


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014207
Abstract
The Pescadero Basin Complex (PBC) comprises three distinctive rhomb-shaped pull-apart basins separated by short and highly overlapped transform faults. Multibeam bathymetric data collected from ship at 40-m resolution, combined with the interpretation of three 2D high-resolution multichannel seismic reflection profiles, were used to establish the architecture of the PBC. Detailed mapping and cross-sectional kinematic modeling based on the seismic images of the North Pescadero Basin reveal a highly evolved pull-part geometry, characterized by a well defined ∼1.8 km-wide axial graben extending ∼32 km in a NNE-SSW direction. Among the fundamental elements controlling basin architecture and evolution of the PBC are the geometry of the initial configuration of the master strike-slip fault step-over and fault dynamics, which may cause transients in fault system activity and basin reconfigurations. Structural analyses carried out in this study point out the PBC pull-apart basins developed under sustained transtensional deformation, where the relative motion of the crustal blocks is oblique and divergent to the transforms or principal displacement zones. Cross-cutting relationships between the main fault systems controlling basin's subsidence and evolution, indicate that underdeveloped basin-crossing faults terminate against basin bounding normal faults, suggesting that ongoing pull-apart rifting continues to dominate basin evolution of the PBC. Furthermore, we propose that the undeveloped cross-basin faults of the PBC initiated as synthetic Riedel faults that, with progressive deformation along the divergent-wrench fault zone, rotated clockwise around a vertical axis to acquire their present orientation oblique to the master bounding transforms. Basin-crossing faults with lesser obliquities control the subsidence along the basin-side faulted segments of the narrow graben systems that characterize the plate boundary at the corners of the PBC pull-apart basins. These narrow transtensional synforms may have served as connections facilitating marine waters to flood the PBC during the early stages of formation of the Gulf of California.