Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland
New 40 Ar/ 39 Ar thermochronological and deformation temperature analyses in the Scandian ( c . 435–420 Ma) orogenic retrowedge of northern Scotland demonstrate accelerated cooling during late syn- to post-orogenic exhumation of the high-grade orogenic core. Initial cooling rates of 10–30 °C M yr -1...
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Geological Society of London
2020
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ftdatacite:10.6084/m9.figshare.c.5087057.v1 2023-05-15T16:03:49+02:00 Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland B.M. Spencer J.R. Thigpen R.D. Law C.A. Mako C.S. McDonald K.V. Hodges K.T. Ashley 2020 https://dx.doi.org/10.6084/m9.figshare.c.5087057.v1 https://geolsoc.figshare.com/collections/Rapid_cooling_during_late_stage_orogenesis_and_implications_for_collapse_of_the_Scandian_retrowedge_northern_Scotland/5087057/1 unknown Geological Society of London https://dx.doi.org/10.1144/jgs2020-022 https://dx.doi.org/10.6084/m9.figshare.c.5087057 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5087057.v1 https://doi.org/10.1144/jgs2020-022 https://doi.org/10.6084/m9.figshare.c.5087057 2021-11-05T12:55:41Z New 40 Ar/ 39 Ar thermochronological and deformation temperature analyses in the Scandian ( c . 435–420 Ma) orogenic retrowedge of northern Scotland demonstrate accelerated cooling during late syn- to post-orogenic exhumation of the high-grade orogenic core. Initial cooling rates of 10–30 °C M yr -1 immediately following peak orogenesis transitioned to rapid rates of 45–90 °C M yr -1 during final exhumation of the Naver thrust sheet in the orogenic core. The flanking ductile thrust sheets exhibit similar, albeit less pronounced acceleration of cooling, with rates increasing by ~150–300 % following peak orogenesis. Closer to the foreland, the Moine thrust sheet did not experience increased cooling rates. Calculated unroofing rates of 3.75 mm yr -1 in the high-grade Naver thrust sheet suggest increasing, rapid exhumation in the orogenic core during a presumed collapse phase of orogenesis. This is contrary to the expectation of decreasing erosional efficiency as topography is diminished, and is interpreted to suggest that unroofing of the Scottish Caledonides may have been partially enhanced by upper crustal extensional deformation during ductile flow of the infrastructure of the orogenic core. Similar processes have been interpreted in the East Greenland Caledonides, which form the northern extension of the Scandian retrowedge. Article in Journal/Newspaper East Greenland Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Open Polar |
collection |
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ftdatacite |
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topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences B.M. Spencer J.R. Thigpen R.D. Law C.A. Mako C.S. McDonald K.V. Hodges K.T. Ashley Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
New 40 Ar/ 39 Ar thermochronological and deformation temperature analyses in the Scandian ( c . 435–420 Ma) orogenic retrowedge of northern Scotland demonstrate accelerated cooling during late syn- to post-orogenic exhumation of the high-grade orogenic core. Initial cooling rates of 10–30 °C M yr -1 immediately following peak orogenesis transitioned to rapid rates of 45–90 °C M yr -1 during final exhumation of the Naver thrust sheet in the orogenic core. The flanking ductile thrust sheets exhibit similar, albeit less pronounced acceleration of cooling, with rates increasing by ~150–300 % following peak orogenesis. Closer to the foreland, the Moine thrust sheet did not experience increased cooling rates. Calculated unroofing rates of 3.75 mm yr -1 in the high-grade Naver thrust sheet suggest increasing, rapid exhumation in the orogenic core during a presumed collapse phase of orogenesis. This is contrary to the expectation of decreasing erosional efficiency as topography is diminished, and is interpreted to suggest that unroofing of the Scottish Caledonides may have been partially enhanced by upper crustal extensional deformation during ductile flow of the infrastructure of the orogenic core. Similar processes have been interpreted in the East Greenland Caledonides, which form the northern extension of the Scandian retrowedge. |
format |
Article in Journal/Newspaper |
author |
B.M. Spencer J.R. Thigpen R.D. Law C.A. Mako C.S. McDonald K.V. Hodges K.T. Ashley |
author_facet |
B.M. Spencer J.R. Thigpen R.D. Law C.A. Mako C.S. McDonald K.V. Hodges K.T. Ashley |
author_sort |
B.M. Spencer |
title |
Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
title_short |
Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
title_full |
Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
title_fullStr |
Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
title_full_unstemmed |
Rapid cooling during late stage orogenesis and implications for collapse of the Scandian retrowedge, northern Scotland |
title_sort |
rapid cooling during late stage orogenesis and implications for collapse of the scandian retrowedge, northern scotland |
publisher |
Geological Society of London |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5087057.v1 https://geolsoc.figshare.com/collections/Rapid_cooling_during_late_stage_orogenesis_and_implications_for_collapse_of_the_Scandian_retrowedge_northern_Scotland/5087057/1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://dx.doi.org/10.1144/jgs2020-022 https://dx.doi.org/10.6084/m9.figshare.c.5087057 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5087057.v1 https://doi.org/10.1144/jgs2020-022 https://doi.org/10.6084/m9.figshare.c.5087057 |
_version_ |
1766399503054667776 |