Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians
The Lloyds River Fault Zone is a 10–15 km wide amphibolite-grade shear zone that formed during the Ordovician Taconic Orogeny. It separates ophiolites and arc–back-arc complexes formed in Iapetus from a peri-Laurentian microcontinent (Dashwoods microcontinent). The Lloyds River Fault Zone comprises...
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American Geophysical Union
2006
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:9912 2023-05-15T17:22:39+02:00 Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians Lissenberg, Cornelis Johan van Staal, Cees R. 2006 application/pdf https://orca.cardiff.ac.uk/id/eprint/9912/ https://doi.org/10.1029/2005TC001789 https://orca.cardiff.ac.uk/id/eprint/9912/1/Lissenberg%202006.pdf en eng American Geophysical Union https://orca.cardiff.ac.uk/id/eprint/9912/1/Lissenberg%202006.pdf Lissenberg, Cornelis Johan https://orca.cardiff.ac.uk/view/cardiffauthors/A127612F.html orcid:0000-0001-7774-2297 orcid:0000-0001-7774-2297 and van Staal, Cees R. 2006. Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians. Tectonics 25 (4) , TC4004. 10.1029/2005TC001789 https://doi.org/10.1029/2005TC001789 file https://orca.cardiff.ac.uk/9912/1/Lissenberg%202006.pdf doi:10.1029/2005TC001789 GC Oceanography QE Geology Article PeerReviewed 2006 ftunivcardiff https://doi.org/10.1029/2005TC001789 2022-10-20T22:34:10Z The Lloyds River Fault Zone is a 10–15 km wide amphibolite-grade shear zone that formed during the Ordovician Taconic Orogeny. It separates ophiolites and arc–back-arc complexes formed in Iapetus from a peri-Laurentian microcontinent (Dashwoods microcontinent). The Lloyds River Fault Zone comprises three high-strain zones, dominantly composed of mylonitic amphibolites, separated by less deformed plutonic rocks. Structural, age and metamorphic data suggest the Lloyds River Fault Zone accommodated sinistral-oblique underthrusting of ophiolites underneath the Dashwoods microcontinent prior to 471 ± 5 Ma at 800°C and 6 kbar. Plutonic rocks within the Lloyds River Fault Zone comprise two suites dated at 464 ± 2 plus 462 ± 2 and 459 ± 3 Ma, respectively. The younger age of the plutons with respect to some of the amphibolites, evidence for magmatic deformation, and the elongate nature of the plutons parallel to the Lloyds River Fault Zone suggest they were emplaced within the fault zone during deformation. Both intrusive episodes triggered renewed deformation at high temperatures (770–750°C), illustrating the positive feedback between deformation and magmatism. Offshoots of the plutons intruded undeformed ophiolitic gabbros outside the Lloyds River Fault Zone. Deformation localized within the intrusive sheets, coeval with static contact metamorphism of the host gabbros, leading to the development of new, small-scale shear zones. This illustrates that channeling of plutons into shear zones and nucleation of shear zones in melt-rich zones may occur simultaneously within the same fault system. Article in Journal/Newspaper Newfoundland Cardiff University: ORCA (Online Research @ Cardiff) Tectonics 25 4 n/a n/a |
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Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Lissenberg, Cornelis Johan van Staal, Cees R. Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
topic_facet |
GC Oceanography QE Geology |
description |
The Lloyds River Fault Zone is a 10–15 km wide amphibolite-grade shear zone that formed during the Ordovician Taconic Orogeny. It separates ophiolites and arc–back-arc complexes formed in Iapetus from a peri-Laurentian microcontinent (Dashwoods microcontinent). The Lloyds River Fault Zone comprises three high-strain zones, dominantly composed of mylonitic amphibolites, separated by less deformed plutonic rocks. Structural, age and metamorphic data suggest the Lloyds River Fault Zone accommodated sinistral-oblique underthrusting of ophiolites underneath the Dashwoods microcontinent prior to 471 ± 5 Ma at 800°C and 6 kbar. Plutonic rocks within the Lloyds River Fault Zone comprise two suites dated at 464 ± 2 plus 462 ± 2 and 459 ± 3 Ma, respectively. The younger age of the plutons with respect to some of the amphibolites, evidence for magmatic deformation, and the elongate nature of the plutons parallel to the Lloyds River Fault Zone suggest they were emplaced within the fault zone during deformation. Both intrusive episodes triggered renewed deformation at high temperatures (770–750°C), illustrating the positive feedback between deformation and magmatism. Offshoots of the plutons intruded undeformed ophiolitic gabbros outside the Lloyds River Fault Zone. Deformation localized within the intrusive sheets, coeval with static contact metamorphism of the host gabbros, leading to the development of new, small-scale shear zones. This illustrates that channeling of plutons into shear zones and nucleation of shear zones in melt-rich zones may occur simultaneously within the same fault system. |
format |
Article in Journal/Newspaper |
author |
Lissenberg, Cornelis Johan van Staal, Cees R. |
author_facet |
Lissenberg, Cornelis Johan van Staal, Cees R. |
author_sort |
Lissenberg, Cornelis Johan |
title |
Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
title_short |
Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
title_full |
Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
title_fullStr |
Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
title_full_unstemmed |
Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians |
title_sort |
feedback between deformation and magmatism in the lloyds river fault zone: an example of episodic fault reactivation in an accretionary setting, newfoundland appalachians |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://orca.cardiff.ac.uk/id/eprint/9912/ https://doi.org/10.1029/2005TC001789 https://orca.cardiff.ac.uk/id/eprint/9912/1/Lissenberg%202006.pdf |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/9912/1/Lissenberg%202006.pdf Lissenberg, Cornelis Johan https://orca.cardiff.ac.uk/view/cardiffauthors/A127612F.html orcid:0000-0001-7774-2297 orcid:0000-0001-7774-2297 and van Staal, Cees R. 2006. Feedback between deformation and magmatism in the Lloyds River Fault Zone: An example of episodic fault reactivation in an accretionary setting, Newfoundland Appalachians. Tectonics 25 (4) , TC4004. 10.1029/2005TC001789 https://doi.org/10.1029/2005TC001789 file https://orca.cardiff.ac.uk/9912/1/Lissenberg%202006.pdf doi:10.1029/2005TC001789 |
op_doi |
https://doi.org/10.1029/2005TC001789 |
container_title |
Tectonics |
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25 |
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4 |
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1766109438055284736 |