Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology
To address Miocene–present episodic v. persistent exhumation, we utilize a simple graphical procedure that vertically stacks spatially diverse K-feldspar 40 Ar/ 39 Ar multi-domain diffusion (MDD) models from the length of the approximately 100 km-long high-peak region of the Eastern Alaska Range. We...
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ftgeosoclonfig:oai:figshare.com:article/3453284 2023-05-15T13:09:27+02:00 Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology Jeff A. Benowitz Paul W. Layer Sam Vanlaningham 2016-06-21T11:17:02Z https://doi.org/10.6084/m9.figshare.3453284.v1 https://figshare.com/articles/Persistent_long-term_em_c_em_24_Ma_exhumation_in_the_Eastern_Alaska_Range_constrained_by_stacked_thermochronology/3453284 unknown doi:10.6084/m9.figshare.3453284.v1 https://figshare.com/articles/Persistent_long-term_em_c_em_24_Ma_exhumation_in_the_Eastern_Alaska_Range_constrained_by_stacked_thermochronology/3453284 CC BY 4.0 CC-BY Geology Eastern Alaska Range exhumation Western Alaska Range MDD Eastern Alaska Range closure age data SW Ar 24 Ma Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3453284.v1 2020-02-21T07:24:22Z To address Miocene–present episodic v. persistent exhumation, we utilize a simple graphical procedure that vertically stacks spatially diverse K-feldspar 40 Ar/ 39 Ar multi-domain diffusion (MDD) models from the length of the approximately 100 km-long high-peak region of the Eastern Alaska Range. We supply additional constraints with 40 Ar/ 39 Ar mica dating because the higher closure-temperature-window places limits on the initiation of rapid Eastern Alaska Range exhumation. We also provide a broad 40 Ar/ 39 Ar K-feldspar minimum closure age data set to add more detail on spatial patterns in the regional exhumation history for the Eastern Alaska Range. We find that rapid and persistent exhumation has occurred in the Eastern Alaska Range since about 24 Ma at a long-term rate of approximately 0.9 km/Ma, but that this rapid exhumation is spatially variable through time. Onset of rapid Eastern Alaska Range exhumation is coincident with the initiation of rapid exhumation in SW Alaska, the Western Alaska Range and the Chugach–Saint Elias Range at around 25 Ma, implying a region-wide deformational response to a change in tectonic forcing. The initiation of highly coupled flat-slab subduction of the Yakutat microplate is probably responsible for this prolonged period of rapid exhumation in southern Alaska. Dataset alaska range Yakutat Alaska Geological Society of London: Figshare |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Eastern Alaska Range exhumation Western Alaska Range MDD Eastern Alaska Range closure age data SW Ar 24 Ma |
spellingShingle |
Geology Eastern Alaska Range exhumation Western Alaska Range MDD Eastern Alaska Range closure age data SW Ar 24 Ma Jeff A. Benowitz Paul W. Layer Sam Vanlaningham Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
topic_facet |
Geology Eastern Alaska Range exhumation Western Alaska Range MDD Eastern Alaska Range closure age data SW Ar 24 Ma |
description |
To address Miocene–present episodic v. persistent exhumation, we utilize a simple graphical procedure that vertically stacks spatially diverse K-feldspar 40 Ar/ 39 Ar multi-domain diffusion (MDD) models from the length of the approximately 100 km-long high-peak region of the Eastern Alaska Range. We supply additional constraints with 40 Ar/ 39 Ar mica dating because the higher closure-temperature-window places limits on the initiation of rapid Eastern Alaska Range exhumation. We also provide a broad 40 Ar/ 39 Ar K-feldspar minimum closure age data set to add more detail on spatial patterns in the regional exhumation history for the Eastern Alaska Range. We find that rapid and persistent exhumation has occurred in the Eastern Alaska Range since about 24 Ma at a long-term rate of approximately 0.9 km/Ma, but that this rapid exhumation is spatially variable through time. Onset of rapid Eastern Alaska Range exhumation is coincident with the initiation of rapid exhumation in SW Alaska, the Western Alaska Range and the Chugach–Saint Elias Range at around 25 Ma, implying a region-wide deformational response to a change in tectonic forcing. The initiation of highly coupled flat-slab subduction of the Yakutat microplate is probably responsible for this prolonged period of rapid exhumation in southern Alaska. |
format |
Dataset |
author |
Jeff A. Benowitz Paul W. Layer Sam Vanlaningham |
author_facet |
Jeff A. Benowitz Paul W. Layer Sam Vanlaningham |
author_sort |
Jeff A. Benowitz |
title |
Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
title_short |
Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
title_full |
Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
title_fullStr |
Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
title_full_unstemmed |
Persistent long-term ( c. 24 Ma) exhumation in the Eastern Alaska Range constrained by stacked thermochronology |
title_sort |
persistent long-term ( c. 24 ma) exhumation in the eastern alaska range constrained by stacked thermochronology |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3453284.v1 https://figshare.com/articles/Persistent_long-term_em_c_em_24_Ma_exhumation_in_the_Eastern_Alaska_Range_constrained_by_stacked_thermochronology/3453284 |
genre |
alaska range Yakutat Alaska |
genre_facet |
alaska range Yakutat Alaska |
op_relation |
doi:10.6084/m9.figshare.3453284.v1 https://figshare.com/articles/Persistent_long-term_em_c_em_24_Ma_exhumation_in_the_Eastern_Alaska_Range_constrained_by_stacked_thermochronology/3453284 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453284.v1 |
_version_ |
1766177375637209088 |