The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia

The interactions between salt diapirs, thrust welds and thrusts in contractional belts are poorly understood due to, first, the inability of seismic data to distinguish between thrusts and welds or resolve associated sub-resolution deformation, and second, the paucity of good field examples. The War...

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Autores: Vidal Royo, Oskar, Rowan, Mark G., Ferrer García, J. Oriol (José Oriol), Fischer, Mark P., Fiduk, J. Carl, Canova, David P., Hearon IV, Thomas E., Giles, Katherine A.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/184425
Acceso en línea:https://hdl.handle.net/2445/184425
Access Level:acceso abierto
Palabra clave:Geologia estructural
Tectònica salina
Falles (Geologia)
Structural geology
Tectonique du sel
Faults (Geology)
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spelling The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South AustraliaVidal Royo, OskarRowan, Mark G.Ferrer García, J. Oriol (José Oriol)Fischer, Mark P.Fiduk, J. CarlCanova, David P.Hearon IV, Thomas E.Giles, Katherine A.Geologia estructuralTectònica salinaFalles (Geologia)Structural geologyTectonique du selFaults (Geology)The interactions between salt diapirs, thrust welds and thrusts in contractional belts are poorly understood due to, first, the inability of seismic data to distinguish between thrusts and welds or resolve associated sub-resolution deformation, and second, the paucity of good field examples. The Warraweena area in the Northern Flinders Ranges of South Australia contains examples of Neoproterozoic to Early Cambrian squeezed diapirs linked by steep reverse faults formed during the Delamerian Orogeny. Benefiting from good field exposures, we use geological mapping, cross-section construction and conceptual structural models to assess the three-dimensional geometry and evolution of the structures, the lateral transition from diapirs to linking faults and the variability of associated meso- and small-scale deformation. Three discrete diapirs consist of narrow outcrops of Callanna Group megabreccia (Willouran in age) up to 5-km long. Their diapiric origin is confirmed by local development of caprock, steepening of flanking strata in composite halokinetic sequences and reworked diapir and roof debris in adjacent strata. The surrounding rocks display only background levels of small-scale deformation. In contrast, the linking faults show no evidence of precursor diapirism, have fault-related anticlines up to 100s of m in wavelength in their hanging walls, and an associated increase in small-scale deformation (i.e. millimetre to metre scale folds, fractures and shear fabrics). The transitions from diapirs to faults occur within less than 200 m as short thrust welds at the diapir terminations. The exposed structures are analogous to those found on the subsurface of other salt basins such as the Gulf of Mexico and the South Atlantic conjugate margins. The results of this work can aid geoscientists evaluating three-way traps against squeezed diapirs, welds or faults, and can help them to predict the style and abundance of both halokinetic and small-scale structures that are below seismic resolution.John Wiley & Sons2022202220212022info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion28 p.application/pdfhttps://hdl.handle.net/2445/184425Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1111/bre.12579Basin Research, 2021, vol. 33, num. 5, p. 2675-2705https://doi.org/10.1111/bre.12579(c) European Association of Geoscientists & Engineers and International Association of Sedimentologists., 2021info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1844252026-05-29T05:05:01Z
dc.title.none.fl_str_mv The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
title The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
spellingShingle The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
Vidal Royo, Oskar
Geologia estructural
Tectònica salina
Falles (Geologia)
Structural geology
Tectonique du sel
Faults (Geology)
title_short The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
title_full The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
title_fullStr The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
title_full_unstemmed The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
title_sort The transition from salt diapir to weld and thrust: Examples from the Northern Flinders Ranges in South Australia
dc.creator.none.fl_str_mv Vidal Royo, Oskar
Rowan, Mark G.
Ferrer García, J. Oriol (José Oriol)
Fischer, Mark P.
Fiduk, J. Carl
Canova, David P.
Hearon IV, Thomas E.
Giles, Katherine A.
author Vidal Royo, Oskar
author_facet Vidal Royo, Oskar
Rowan, Mark G.
Ferrer García, J. Oriol (José Oriol)
Fischer, Mark P.
Fiduk, J. Carl
Canova, David P.
Hearon IV, Thomas E.
Giles, Katherine A.
author_role author
author2 Rowan, Mark G.
Ferrer García, J. Oriol (José Oriol)
Fischer, Mark P.
Fiduk, J. Carl
Canova, David P.
Hearon IV, Thomas E.
Giles, Katherine A.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Geologia estructural
Tectònica salina
Falles (Geologia)
Structural geology
Tectonique du sel
Faults (Geology)
topic Geologia estructural
Tectònica salina
Falles (Geologia)
Structural geology
Tectonique du sel
Faults (Geology)
description The interactions between salt diapirs, thrust welds and thrusts in contractional belts are poorly understood due to, first, the inability of seismic data to distinguish between thrusts and welds or resolve associated sub-resolution deformation, and second, the paucity of good field examples. The Warraweena area in the Northern Flinders Ranges of South Australia contains examples of Neoproterozoic to Early Cambrian squeezed diapirs linked by steep reverse faults formed during the Delamerian Orogeny. Benefiting from good field exposures, we use geological mapping, cross-section construction and conceptual structural models to assess the three-dimensional geometry and evolution of the structures, the lateral transition from diapirs to linking faults and the variability of associated meso- and small-scale deformation. Three discrete diapirs consist of narrow outcrops of Callanna Group megabreccia (Willouran in age) up to 5-km long. Their diapiric origin is confirmed by local development of caprock, steepening of flanking strata in composite halokinetic sequences and reworked diapir and roof debris in adjacent strata. The surrounding rocks display only background levels of small-scale deformation. In contrast, the linking faults show no evidence of precursor diapirism, have fault-related anticlines up to 100s of m in wavelength in their hanging walls, and an associated increase in small-scale deformation (i.e. millimetre to metre scale folds, fractures and shear fabrics). The transitions from diapirs to faults occur within less than 200 m as short thrust welds at the diapir terminations. The exposed structures are analogous to those found on the subsurface of other salt basins such as the Gulf of Mexico and the South Atlantic conjugate margins. The results of this work can aid geoscientists evaluating three-way traps against squeezed diapirs, welds or faults, and can help them to predict the style and abundance of both halokinetic and small-scale structures that are below seismic resolution.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/184425
url https://hdl.handle.net/2445/184425
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1111/bre.12579
Basin Research, 2021, vol. 33, num. 5, p. 2675-2705
https://doi.org/10.1111/bre.12579
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 28 p.
application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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