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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Geological Society of America
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Online Access: | http://eprints.esc.cam.ac.uk/3778/ http://eprints.esc.cam.ac.uk/3778/1/379.full.pdf https://doi.org/10.1130/L522.1 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:3778 2023-05-15T17:34:11+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. 2016-08 text http://eprints.esc.cam.ac.uk/3778/ http://eprints.esc.cam.ac.uk/3778/1/379.full.pdf https://doi.org/10.1130/L522.1 en eng Geological Society of America http://eprints.esc.cam.ac.uk/3778/1/379.full.pdf Ault, Alexis K. and Frenzel, Max and Reiners, Peter W. and Woodcock, Nigel H. and Thomson, Stuart N. (2016) 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. Lithosphere, 8 (4). pp. 379-385. ISSN 1941-8264, 1947-4253 DOI https://doi.org/10.1130/L522.1 <https://doi.org/10.1130/L522.1> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2016 ftucambridgeesc https://doi.org/10.1130/L522.1 2020-08-27T18:09:47Z 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. Article in Journal/Newspaper North Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications Lithosphere 8 4 379 385 |
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Open Polar |
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University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics 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 |
02 - Geodynamics Geophysics and Tectonics |
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. |
format |
Article in Journal/Newspaper |
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 |
Geological Society of America |
publishDate |
2016 |
url |
http://eprints.esc.cam.ac.uk/3778/ http://eprints.esc.cam.ac.uk/3778/1/379.full.pdf https://doi.org/10.1130/L522.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/3778/1/379.full.pdf Ault, Alexis K. and Frenzel, Max and Reiners, Peter W. and Woodcock, Nigel H. and Thomson, Stuart N. (2016) 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. Lithosphere, 8 (4). pp. 379-385. ISSN 1941-8264, 1947-4253 DOI https://doi.org/10.1130/L522.1 <https://doi.org/10.1130/L522.1> |
op_doi |
https://doi.org/10.1130/L522.1 |
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Lithosphere |
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8 |
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4 |
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379 |
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385 |
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1766132939745132544 |