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Título: | Basement-Cover Relationships and Their Along-Strike Changes in the Linking Zone (Iberian Range, Spain): A Combined Structural and Gravimetric Study |
Autor: | Izquierdo Llavall, Esther; Ayala, C. CSIC ORCID ; Pueyo Morer, Emilio Luis CSIC ORCID; Casas-Sainz, Antonio M.; Oliva-Urcia, Belén CSIC ORCID; Rubio Sánchez-Aguililla, Félix Manuel; Rodríguez Pintó, Adriana; Rey Moral, María del Carmen; Mediato Arribas, José Francisco; Garcia-Crespo, J. | Palabras clave: | Bouguer anomaly Cross sections gravity modeling petrophysics Linking Zone Iberian Range |
Fecha de publicación: | 2019 | Editor: | American Geophysical Union | Citación: | Tectonics, 38(8): 2934-2960 (2019) | Resumen: | Contractional deformation in the transition between the Iberian and Catalan Coastal Ranges (Linking Zone) generated both thin-skinned structures detached in low-strength Triassic units and basement-involved structures. To evaluate their extent and relative contribution to the overall structure, we carried out a study combining structural geology and gravimetry. New gravity data (938 stations) and density determinations (827 samples) were acquired and combined with previous existing databases to obtain Bouguer anomaly and residual Bouguer anomaly maps of the study area. Seven serial and balanced cross sections were built, their depth geometries being constrained through the 2.5-D gravity modeling and the 3-D gravity inversion that we accomplished. The residual Bouguer anomaly map shows a good correlation between basement antiforms and gravity highs whereas negative anomalies mostly correspond to (i) Meso-Cenozoic synclines and (ii) Neogene-Quaternary basins. Cross sections depict a southern, thick-skinned domain where extensional, basement faults inherited from Late Jurassic-Early Cretaceous times were inverted during the Cenozoic. To the north, we interpret the existence of both Triassic-detached and basement-involved deformation domains. The two deformation styles are vertically overlapped in the southernmost part of the Catalan Coastal Ranges but relay both across and along strike in the Eastern Iberian Range. These basement and cover relationships and their along-strike variations are analyzed in terms of the interplay between structural inheritance, its obliquity to the shortening direction, and the continuity and effectiveness of Triassic décollements in the study area. | URI: | http://hdl.handle.net/10261/196270 | DOI: | 10.1029/2018TC005422 | Identificadores: | doi: 10.1029/2018TC005422 issn: 1944-9194 |
Aparece en las colecciones: | (Geo3Bcn) Artículos (IGME) Artículos |
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Ayala_Tectonics_38_8_2934.pdf | 5,28 MB | Adobe PDF | Visualizar/Abrir |
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