Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada.
This paper presents the results of a detailed multidisciplinary study of the deformed bedrock and overlying Quaternary sediments exposed at the Mud Buttes in southern Alberta, Canada. This large, arcuate cupola hill is composed of intensely folded and thrust sandstones, siltstones and mudstones of t...
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Online Access: | http://dro.dur.ac.uk/21524/ http://dro.dur.ac.uk/21524/1/21524.pdf https://doi.org/10.1016/j.quascirev.2017.03.027 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:21524 2023-05-15T16:40:46+02:00 Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. Phillips, Emrys Evans, David J.A. Atkinson, Nigel Kendall, Allison 2017-05-15 application/pdf http://dro.dur.ac.uk/21524/ http://dro.dur.ac.uk/21524/1/21524.pdf https://doi.org/10.1016/j.quascirev.2017.03.027 unknown Elsevier dro:21524 issn:0277-3791 doi:10.1016/j.quascirev.2017.03.027 http://dro.dur.ac.uk/21524/ https://doi.org/10.1016/j.quascirev.2017.03.027 http://dro.dur.ac.uk/21524/1/21524.pdf © 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Quaternary science reviews, 2017, Vol.164, pp.110-139 [Peer Reviewed Journal] Article PeerReviewed 2017 ftunivdurham https://doi.org/10.1016/j.quascirev.2017.03.027 2020-06-04T22:23:44Z This paper presents the results of a detailed multidisciplinary study of the deformed bedrock and overlying Quaternary sediments exposed at the Mud Buttes in southern Alberta, Canada. This large, arcuate cupola hill is composed of intensely folded and thrust sandstones, siltstones and mudstones of the Cretaceous Belly River Formation. Glacitectonism responsible for the development of this internally complex landform occurred at the margin of the newly defined Prospect Valley lobe of the Laurentide Ice Sheet. Analysis of the deformation structures reveals that construction of this landform occurred in response to at least two phases of south-directed ice sheet advance separated by a period of retreat. The first phase led to the formation of a forward propagating imbricate thrust stack leading to polyphase deformation of the Belly River Formation. D1 thrusting led to the detachment of thrust-bound slices of bedrock which were accreted to the base of the developing imbricate stack. This process resulted in the structurally higher and older thrust-slices being progressively “back-rotated” (tilted), accompanied by D2 thrusting and folding. Further thrusting during D3 was restricted to the core of the Mud Buttes as the deforming sequence accommodated further compression imposed by the advancing ice. Minor oscillations of the ice margin led to localised brittle-ductile shearing (D4) of the bedrock immediately adjacent to the ice contact part of the thrust stack. The second phase of ice advance led to the accretion of a relatively simple thrust and folded sequence seen the northern side of Mud Buttes. The resulting composite thrust moraine was subsequently overridden by ice advancing from the NNW to form a dome-like cupola-hill. This readvance of the Prospect Valley lobe led to the formation of a thin carapace of Quaternary sediments mantling the Mud Buttes which include glacitectonite, till and an organic-rich clay-silt (?palaeosol). Article in Journal/Newspaper Ice Sheet Durham University: Durham Research Online Canada Cupola ENVELOPE(-70.444,-70.444,-69.347,-69.347) Quaternary Science Reviews 164 110 139 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
This paper presents the results of a detailed multidisciplinary study of the deformed bedrock and overlying Quaternary sediments exposed at the Mud Buttes in southern Alberta, Canada. This large, arcuate cupola hill is composed of intensely folded and thrust sandstones, siltstones and mudstones of the Cretaceous Belly River Formation. Glacitectonism responsible for the development of this internally complex landform occurred at the margin of the newly defined Prospect Valley lobe of the Laurentide Ice Sheet. Analysis of the deformation structures reveals that construction of this landform occurred in response to at least two phases of south-directed ice sheet advance separated by a period of retreat. The first phase led to the formation of a forward propagating imbricate thrust stack leading to polyphase deformation of the Belly River Formation. D1 thrusting led to the detachment of thrust-bound slices of bedrock which were accreted to the base of the developing imbricate stack. This process resulted in the structurally higher and older thrust-slices being progressively “back-rotated” (tilted), accompanied by D2 thrusting and folding. Further thrusting during D3 was restricted to the core of the Mud Buttes as the deforming sequence accommodated further compression imposed by the advancing ice. Minor oscillations of the ice margin led to localised brittle-ductile shearing (D4) of the bedrock immediately adjacent to the ice contact part of the thrust stack. The second phase of ice advance led to the accretion of a relatively simple thrust and folded sequence seen the northern side of Mud Buttes. The resulting composite thrust moraine was subsequently overridden by ice advancing from the NNW to form a dome-like cupola-hill. This readvance of the Prospect Valley lobe led to the formation of a thin carapace of Quaternary sediments mantling the Mud Buttes which include glacitectonite, till and an organic-rich clay-silt (?palaeosol). |
format |
Article in Journal/Newspaper |
author |
Phillips, Emrys Evans, David J.A. Atkinson, Nigel Kendall, Allison |
spellingShingle |
Phillips, Emrys Evans, David J.A. Atkinson, Nigel Kendall, Allison Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
author_facet |
Phillips, Emrys Evans, David J.A. Atkinson, Nigel Kendall, Allison |
author_sort |
Phillips, Emrys |
title |
Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
title_short |
Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
title_full |
Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
title_fullStr |
Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
title_full_unstemmed |
Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada. |
title_sort |
structural architecture and glacitectonic evolution of the mud buttes cupola hill complex, southern alberta, canada. |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://dro.dur.ac.uk/21524/ http://dro.dur.ac.uk/21524/1/21524.pdf https://doi.org/10.1016/j.quascirev.2017.03.027 |
long_lat |
ENVELOPE(-70.444,-70.444,-69.347,-69.347) |
geographic |
Canada Cupola |
geographic_facet |
Canada Cupola |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary science reviews, 2017, Vol.164, pp.110-139 [Peer Reviewed Journal] |
op_relation |
dro:21524 issn:0277-3791 doi:10.1016/j.quascirev.2017.03.027 http://dro.dur.ac.uk/21524/ https://doi.org/10.1016/j.quascirev.2017.03.027 http://dro.dur.ac.uk/21524/1/21524.pdf |
op_rights |
© 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.03.027 |
container_title |
Quaternary Science Reviews |
container_volume |
164 |
container_start_page |
110 |
op_container_end_page |
139 |
_version_ |
1766031180133564416 |