Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales
Fault rock low-temperature thermochronometry can inform the timing, temperature, and significance of hydrothermal fluid circulation in fault systems. We demonstrate this with combined hematite (U-Th)/He (He) dating, and sandstone apatite fission-track (AFT) and apatite and zircon (U-Th)/He (He) ther...
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ftutahsudc:oai:digitalcommons.usu.edu:geology_facpub-1478 2023-05-15T17:34:32+02:00 Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales Ault, Alexis K. Frenzel, Max Reiners, Peter W. Woodcock, Nigel H. Thomson, Stuart N. Geological Society of America 2016-05-12T07:00:00Z text/html https://digitalcommons.usu.edu/geology_facpub/479 https://digitalcommons.usu.edu/context/geology_facpub/article/1478/type/native/viewcontent unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/geology_facpub/479 https://digitalcommons.usu.edu/context/geology_facpub/article/1478/type/native/viewcontent Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM Geosciences Faculty Publications Earth Sciences Geology Physical Sciences and Mathematics text 2016 ftutahsudc 2022-03-07T22:18:15Z Fault rock low-temperature thermochronometry can inform the timing, temperature, and significance of hydrothermal fluid circulation in fault systems. We demonstrate this with combined hematite (U-Th)/He (He) dating, and sandstone apatite fission-track (AFT) and apatite and zircon (U-Th)/He (He) thermochronometry from fault-related fissures on the Gower Peninsula, Wales. Hematite He dates from 141 ± 5.1 Ma to 120 ± 5.0 Ma overlap with a 131 ± 20 Ma sandstone infill AFT date. Individual zircon He dates are 402–260 Ma, reflecting source material erosion, and imply a maximum Late Permian infill depositional age. Burial history reconstruction reveals modern exposures were not buried sufficiently in the Triassic–Early Cretaceous to have caused reheating to temperatures necessary to reset the AFT or hematite He systems, and thus these dates cannot reflect cooling due to erosion alone. Hot fluids circulating through fissures in the Early Cretaceous reset the AFT system. Hematite was either also reset by fluids or precipitated from these fluids. Similar hematite He dates from fault-related mineralization in south Glamorgan (Wales) and Cumbria (England) imply concomitant regional hot groundwater flow along faults. In this example, hydrothermal fluid circulation, coeval with North Atlantic rifting, occurred in higher-permeability fissures and fault veins long after they initially formed, directly influencing local and regional geothermal gradients. Text North Atlantic Utah State University: DigitalCommons@USU |
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Utah State University: DigitalCommons@USU |
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Earth Sciences Geology Physical Sciences and Mathematics |
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Earth Sciences Geology Physical Sciences and Mathematics Ault, Alexis K. Frenzel, Max Reiners, Peter W. Woodcock, Nigel H. Thomson, Stuart N. Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
topic_facet |
Earth Sciences Geology Physical Sciences and Mathematics |
description |
Fault rock low-temperature thermochronometry can inform the timing, temperature, and significance of hydrothermal fluid circulation in fault systems. We demonstrate this with combined hematite (U-Th)/He (He) dating, and sandstone apatite fission-track (AFT) and apatite and zircon (U-Th)/He (He) thermochronometry from fault-related fissures on the Gower Peninsula, Wales. Hematite He dates from 141 ± 5.1 Ma to 120 ± 5.0 Ma overlap with a 131 ± 20 Ma sandstone infill AFT date. Individual zircon He dates are 402–260 Ma, reflecting source material erosion, and imply a maximum Late Permian infill depositional age. Burial history reconstruction reveals modern exposures were not buried sufficiently in the Triassic–Early Cretaceous to have caused reheating to temperatures necessary to reset the AFT or hematite He systems, and thus these dates cannot reflect cooling due to erosion alone. Hot fluids circulating through fissures in the Early Cretaceous reset the AFT system. Hematite was either also reset by fluids or precipitated from these fluids. Similar hematite He dates from fault-related mineralization in south Glamorgan (Wales) and Cumbria (England) imply concomitant regional hot groundwater flow along faults. In this example, hydrothermal fluid circulation, coeval with North Atlantic rifting, occurred in higher-permeability fissures and fault veins long after they initially formed, directly influencing local and regional geothermal gradients. |
author2 |
Geological Society of America |
format |
Text |
author |
Ault, Alexis K. Frenzel, Max Reiners, Peter W. Woodcock, Nigel H. Thomson, Stuart N. |
author_facet |
Ault, Alexis K. Frenzel, Max Reiners, Peter W. Woodcock, Nigel H. Thomson, Stuart N. |
author_sort |
Ault, Alexis K. |
title |
Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
title_short |
Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
title_full |
Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
title_fullStr |
Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
title_full_unstemmed |
Record of paleofluid circulation in faults revealed by hematite (U-TH)/He and apatite fission-track dating: an example from Gower Peninsula Fault Fissures, Wales |
title_sort |
record of paleofluid circulation in faults revealed by hematite (u-th)/he and apatite fission-track dating: an example from gower peninsula fault fissures, wales |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2016 |
url |
https://digitalcommons.usu.edu/geology_facpub/479 https://digitalcommons.usu.edu/context/geology_facpub/article/1478/type/native/viewcontent |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Geosciences Faculty Publications |
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https://digitalcommons.usu.edu/geology_facpub/479 https://digitalcommons.usu.edu/context/geology_facpub/article/1478/type/native/viewcontent |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
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