Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry
Abstract We investigate (i) margin‐scale structural inheritance in rifts and (ii) the time scales of rift propagation and rift length establishment, using the East Greenland rift system (EGR) as an example. To investigate the controls of the underlying Caledonian structural grain on the development...
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/133779 2023-11-05T03:41:40+01:00 Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. 2018 https://resolver.sub.uni-goettingen.de/purl?gro-2/133779 https://doi.org/10.1029/2018TC005018 en eng https://resolver.sub.uni-goettingen.de/purl?gro-2/133779 doi:10.1029/2018TC005018 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/article journal_article yes 2018 ftsubgoettingen https://doi.org/10.1029/2018TC005018 2023-10-08T16:57:58Z Abstract We investigate (i) margin‐scale structural inheritance in rifts and (ii) the time scales of rift propagation and rift length establishment, using the East Greenland rift system (EGR) as an example. To investigate the controls of the underlying Caledonian structural grain on the development of the EGR, we juxtapose new age constraints on rift faulting with existing geochronological and structural evidence. Results from K‐Ar illite fault dating and syn‐rift growth strata in hangingwall basins suggest initial faulting in Mississippian times and episodes of fault activity in Middle‐Late Pennsylvanian, Middle Permian, and Middle Jurassic to Early Cretaceous times. Several lines of evidence indicate a close relationship between low‐angle late‐to‐post‐Caledonian extensional shear zones (CESZs) and younger rift structure: (i) reorientation of rift fault strike to conform with CESZs, (ii) spatial coincidence of rift‐scale transfer zones with CESZs, and (iii) close temporal coincidence between the latest activity (late Devonian) on the preexisting network of CESZs and the earliest rift faulting (latest Devonian to earliest Carboniferous). Late‐ to post‐Caledonian extensional detachments therefore likely acted as a template for the establishment of the EGR. We also conclude that the EGR established its near‐full length rapidly, i.e., within 4–20% of rift life. The “constant‐length model” for normal fault growth may therefore be applicable at rift scale, but tip propagation, relay breaching, and linkage may dominate border fault systems during rapid lengthening. Key Points Geochronological and structural evidence suggest close temporal and spatial relationship between basement grain and younger rift structure Rapid establishment of rift length (within 4–20% of rift life) suggests “constant‐length model” for fault growth may apply also at rift scale Tip propagation, relay breaching, and linkage may, however, dominate border fault systems during early rapid lengthening Funder: Norges Forskningsråd ... Article in Journal/Newspaper East Greenland Greenland Georg-August-Universität Göttingen: GoeScholar Tectonics 37 6 1858 1875 |
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Open Polar |
collection |
Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
English |
description |
Abstract We investigate (i) margin‐scale structural inheritance in rifts and (ii) the time scales of rift propagation and rift length establishment, using the East Greenland rift system (EGR) as an example. To investigate the controls of the underlying Caledonian structural grain on the development of the EGR, we juxtapose new age constraints on rift faulting with existing geochronological and structural evidence. Results from K‐Ar illite fault dating and syn‐rift growth strata in hangingwall basins suggest initial faulting in Mississippian times and episodes of fault activity in Middle‐Late Pennsylvanian, Middle Permian, and Middle Jurassic to Early Cretaceous times. Several lines of evidence indicate a close relationship between low‐angle late‐to‐post‐Caledonian extensional shear zones (CESZs) and younger rift structure: (i) reorientation of rift fault strike to conform with CESZs, (ii) spatial coincidence of rift‐scale transfer zones with CESZs, and (iii) close temporal coincidence between the latest activity (late Devonian) on the preexisting network of CESZs and the earliest rift faulting (latest Devonian to earliest Carboniferous). Late‐ to post‐Caledonian extensional detachments therefore likely acted as a template for the establishment of the EGR. We also conclude that the EGR established its near‐full length rapidly, i.e., within 4–20% of rift life. The “constant‐length model” for normal fault growth may therefore be applicable at rift scale, but tip propagation, relay breaching, and linkage may dominate border fault systems during rapid lengthening. Key Points Geochronological and structural evidence suggest close temporal and spatial relationship between basement grain and younger rift structure Rapid establishment of rift length (within 4–20% of rift life) suggests “constant‐length model” for fault growth may apply also at rift scale Tip propagation, relay breaching, and linkage may, however, dominate border fault systems during early rapid lengthening Funder: Norges Forskningsråd ... |
author2 |
Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. |
format |
Article in Journal/Newspaper |
author |
Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. |
spellingShingle |
Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
author_facet |
Rotevatn, A. Kristensen, T. B. Ksienzyk, A. K. Wemmer, K. Henstra, G. A. Midtkandal, I. Grundvåg, S.‐A. Andresen, A. |
author_sort |
Rotevatn, A. |
title |
Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
title_short |
Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
title_full |
Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
title_fullStr |
Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
title_full_unstemmed |
Structural Inheritance and Rapid Rift‐Length Establishment in a Multiphase Rift: The East Greenland Rift System and its Caledonian Orogenic Ancestry |
title_sort |
structural inheritance and rapid rift‐length establishment in a multiphase rift: the east greenland rift system and its caledonian orogenic ancestry |
publishDate |
2018 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133779 https://doi.org/10.1029/2018TC005018 |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133779 doi:10.1029/2018TC005018 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2018TC005018 |
container_title |
Tectonics |
container_volume |
37 |
container_issue |
6 |
container_start_page |
1858 |
op_container_end_page |
1875 |
_version_ |
1781698141374906368 |