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Artículo

Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport

Cilona, Antonino; Aydin, Atilla; Likerman, JeremiasIcon ; Parker, Beth; Cherry, John
Fecha de publicación: 02/2016
Editorial: Elsevier
Revista: Journal Of Structural Geology
ISSN: 0191-8141
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geociencias multidisciplinaria

Resumen

This paper describes the properties of faults and fractures in the Upper Cretaceous Chatsworth Formation exposed at Santa Susana Field Laboratory and its surroundings (Simi Hills, California), where groundwater flow and contamination have been studied for over three decades. The complex depositional architecture of this turbidite consisting of alternating sandstones and shales, interacting with formative stress conditions are responsible for multi-scale fault hierarchies and permeable fractures in which nearly all groundwater flow occurs. Intensity and distribution of background fractures and their relation to bedding thickness are established for sandstones, the dominant lithology. The architecture of faults with increasing displacement is described, and relationships among fault dimensional parameters captured. Data from ∼400 boreholes and piezometers reveal the effect of faults and fractures on groundwater flow. Large hydraulic head differences, observed across fault zones with shale-rich cores, indicate these structures as cross-flow barriers. Moreover, hydraulic head profiles under ambient conditions, and pumping tests suggest strong hydraulic connectivity in all directions to depth of hundreds of meters. This outcrop-based structural characterization relates the horizontal hydraulic conductivity to the observed well-connected fracture network, and explains the strong vertical connectivity across low-hydraulic conductivity shales as faults and sheared fractures provide flow pathways.
Palabras clave: Joint Zones , Fracture Attributes , Fault Zone Hierarchy , Fracture Dimensional Parameters
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/20670
DOI: http://dx.doi.org/10.1016/j.jsg.2016.02.003
URL: http://www.sciencedirect.com/science/article/pii/S0191814116300128
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Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Citación
Cilona, Antonino; Aydin, Atilla; Likerman, Jeremias; Parker, Beth; Cherry, John; Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport; Elsevier; Journal Of Structural Geology; 85; 2-2016; 95-114
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