3D geometry and architecture of a normal fault zone in poorly lithified sediments: A trench study on a strand of the Baza Fault, central Betic Cordillera, south Spain
| Autor: | Francisco J. García-Tortosa, Pedro Alfaro, Iván Medina-Cascales, Leah Jean Koch, Ivan Martin-Rojas, Nestor Cardozo |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente, Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante |
| Rok vydání: | 2019 |
| Předmět: |
Maturity (geology)
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Clay injection Outcrop Trench study Fault smears Poorly lithified sediments Geology Deformation (meteorology) Fault (geology) 010502 geochemistry & geophysics 01 natural sciences Normal fault zone Stratigraphy Trench Geodinámica Interna Sedimentary rock Petrology Lithification 0105 earth and related environmental sciences |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| ISSN: | 0191-8141 |
| DOI: | 10.1016/j.jsg.2019.02.003 |
| Popis: | Successive excavation of 13 trenches of different orientations reveals the complexity of a normal fault zone in Pliocene-Pleistocene unconsolidated sediments on a strand of the Baza Fault, central Betic Cordillera, south Spain. These trenches and the excavation floor are interpreted and integrated to reconstruct the 3D geometry and internal architecture of the fault zone. The structure consists of two main fault strands: an eastern one with a few hundred metres throw and a western one with at least 15 m throw. These strands interact and gradually merge to the south, bounding a main deformation zone narrowing from ∼7 to 1 m along strike. Fault-bounded rock bodies, clay and sand smears, and clay injections define the structure. These features are highly variable in 3D. In the northern part of the outcrop, deformation is localized around the main strands, brittle in the west and more ductile to the east. As the strands and their fault zones increasingly interact, fault throw, rock deformation and maturity of the structure increase. Mechanical stratigraphy also controls the style of deformation. A realistic representation of this 4D picture of fault deformation is critical for modelling fluid flow in shallow to possibly deep, faulted sedimentary reservoirs. This research was founded by research group VIGROB053 (University of Alicante). |
| Databáze: | OpenAIRE |
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