Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina

Seismic reflection data and field observations have revealed the presence of voluminous igneous sill complexes emplaced into organic-rich shale formations in sedimentary basins worldwide. Damage and structures associated with sills have major implications for fluid flow through basins. Constraining...

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Autores principales: Spacapan, Juan Bautista, Galland, Olivier, Leanza, Héctor Armando, Planke, Sverre
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Geología
Argentina
Neuquén basin
Cuesta del Chihuido
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102268
https://ri.conicet.gov.ar/11336/47361
http://jgs.lyellcollection.org/content/174/3/422
https://pubs.geoscienceworld.org/jgs/article/174/3/422/317683/igneous-sill-and-finger-emplacement-mechanism-in
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-102268
record_format dspace
spelling I19-R120-10915-1022682023-05-16T13:10:42Z http://sedici.unlp.edu.ar/handle/10915/102268 https://ri.conicet.gov.ar/11336/47361 http://jgs.lyellcollection.org/content/174/3/422 https://pubs.geoscienceworld.org/jgs/article/174/3/422/317683/igneous-sill-and-finger-emplacement-mechanism-in issn:2041-479X Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina Spacapan, Juan Bautista Galland, Olivier Leanza, Héctor Armando Planke, Sverre 2016-12 2020-08-13T18:05:03Z en Geología Argentina Neuquén basin Cuesta del Chihuido Seismic reflection data and field observations have revealed the presence of voluminous igneous sill complexes emplaced into organic-rich shale formations in sedimentary basins worldwide. Damage and structures associated with sills have major implications for fluid flow through basins. Constraining the distribution of these structures requires a good understanding of the sill emplacement mechanism. However, most mechanical models of sill emplacement assume elastic host behaviour, whereas shale is expected to deform inelastically. This contradiction calls for new field observations to better constrain sill emplacement mechanisms. In this paper, we report on detailed field observations of spectacularly exposed fingers and a sill emplaced in shale at Cuesta del Chihuido, in the Neuquén Basin, Argentina. Exceptional outcrop conditions allow detailed descriptions of both (1) the entire cross-section of the intrusions, and (2) the deformation structures accommodating intrusion propagation in the host rock. All intrusions exhibit irregular, blunt or rectangular tips. The structures accommodating the tip propagation are systematically compressional, including reverse faults, folding and imbricate thrust system. Our observations suggest that the studied intrusions have propagated by pushing the host rock ahead, as a viscous indenter. Our observations suggest that the viscous indenter model is probably a dominant mechanism of sill emplacement in shale. Facultad de Ciencias Naturales y Museo Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 422-433
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Argentina
Neuquén basin
Cuesta del Chihuido
spellingShingle Geología
Argentina
Neuquén basin
Cuesta del Chihuido
Spacapan, Juan Bautista
Galland, Olivier
Leanza, Héctor Armando
Planke, Sverre
Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
topic_facet Geología
Argentina
Neuquén basin
Cuesta del Chihuido
description Seismic reflection data and field observations have revealed the presence of voluminous igneous sill complexes emplaced into organic-rich shale formations in sedimentary basins worldwide. Damage and structures associated with sills have major implications for fluid flow through basins. Constraining the distribution of these structures requires a good understanding of the sill emplacement mechanism. However, most mechanical models of sill emplacement assume elastic host behaviour, whereas shale is expected to deform inelastically. This contradiction calls for new field observations to better constrain sill emplacement mechanisms. In this paper, we report on detailed field observations of spectacularly exposed fingers and a sill emplaced in shale at Cuesta del Chihuido, in the Neuquén Basin, Argentina. Exceptional outcrop conditions allow detailed descriptions of both (1) the entire cross-section of the intrusions, and (2) the deformation structures accommodating intrusion propagation in the host rock. All intrusions exhibit irregular, blunt or rectangular tips. The structures accommodating the tip propagation are systematically compressional, including reverse faults, folding and imbricate thrust system. Our observations suggest that the studied intrusions have propagated by pushing the host rock ahead, as a viscous indenter. Our observations suggest that the viscous indenter model is probably a dominant mechanism of sill emplacement in shale.
format Articulo
Articulo
author Spacapan, Juan Bautista
Galland, Olivier
Leanza, Héctor Armando
Planke, Sverre
author_facet Spacapan, Juan Bautista
Galland, Olivier
Leanza, Héctor Armando
Planke, Sverre
author_sort Spacapan, Juan Bautista
title Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
title_short Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
title_full Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
title_fullStr Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
title_full_unstemmed Igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at Cuesta del Chihuido, Neuquén Basin, Argentina
title_sort igneous sill and finger emplacement mechanism in shale-dominated formations: a field study at cuesta del chihuido, neuquén basin, argentina
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/102268
https://ri.conicet.gov.ar/11336/47361
http://jgs.lyellcollection.org/content/174/3/422
https://pubs.geoscienceworld.org/jgs/article/174/3/422/317683/igneous-sill-and-finger-emplacement-mechanism-in
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