Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology
The Haughton Dome located on Devon Island, in the Canadian Archipelago represents a well-preserved, moderate-sized, complex impact crater. Previous age constraints for the 24 km-diameter impact structure have ranged from ca. 21 Ma to ca. 39 Ma. Herein, we present a coordinated microstructural and in...
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| Format: | Journal Article |
| Language: | English |
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PERGAMON-ELSEVIER SCIENCE LTD
2021
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| Online Access: | http://hdl.handle.net/20.500.11937/90162 |
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| author | Erickson, Timmons Kirkland, Chris Jourdan, Fred Schmieder, M. Hartnady, Michael Cox, Morgan A. Timms, Nick |
| author_facet | Erickson, Timmons Kirkland, Chris Jourdan, Fred Schmieder, M. Hartnady, Michael Cox, Morgan A. Timms, Nick |
| author_sort | Erickson, Timmons |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Haughton Dome located on Devon Island, in the Canadian Archipelago represents a well-preserved, moderate-sized, complex impact crater. Previous age constraints for the 24 km-diameter impact structure have ranged from ca. 21 Ma to ca. 39 Ma. Herein, we present a coordinated microstructural and in situ U-Pb study of zircon and monazite coupled with 40Ar/39Ar laser step heating of shock-melted K-feldspar clasts from shock metamorphosed gneissic fragments collected from the allochthonous impact breccia at Haughton. Moderately shocked zircon and monazite grains yield an age distribution consistent with an Archean protolith metamorphosed at ca. 1.9 Ga, whereas shock recrystallized zircon and monazite yield a lower intercept age of 31.8 ± 1.7 Ma (n = 48, MSWD = 0.58, P = 0.99). Four inverse isochron 40Ar/39Ar ages of shocked feldspar clasts yield a weighted mean age of 31.04 ± 0.37 Ma (MSWD = 0.98, P = 0.40), within uncertainty of the U-Pb lower concordia intercept. Ar diffusion modelling supports the interpretation of the impact age and helps resolve impact-driven age resetting. These results highlight the power of coupling multiple geochronologic techniques for determining impact ages, especially from targets with complex geologic histories. Furthermore, they resolve previous discrepancies in the age of the Haughton Dome and the interpretation of the post impact stratigraphy of the crater fill. |
| first_indexed | 2025-11-14T11:33:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-90162 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:43Z |
| publishDate | 2021 |
| publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-901622023-02-13T05:46:16Z Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology Erickson, Timmons Kirkland, Chris Jourdan, Fred Schmieder, M. Hartnady, Michael Cox, Morgan A. Timms, Nick Science & Technology Physical Sciences Geochemistry & Geophysics Shock metamorphism Zircon Monazite U-Pb 40Ar/39Ar INDUCED HYDROTHERMAL ACTIVITY CANYON SANIDINE STANDARD SHOCK-WAVE METAMORPHISM K-40 DECAY CONSTANTS DEVON-ISLAND ISOTOPIC COMPOSITION JOINT DETERMINATION IMPROVED ACCURACY ARGON DIFFUSION K-AR The Haughton Dome located on Devon Island, in the Canadian Archipelago represents a well-preserved, moderate-sized, complex impact crater. Previous age constraints for the 24 km-diameter impact structure have ranged from ca. 21 Ma to ca. 39 Ma. Herein, we present a coordinated microstructural and in situ U-Pb study of zircon and monazite coupled with 40Ar/39Ar laser step heating of shock-melted K-feldspar clasts from shock metamorphosed gneissic fragments collected from the allochthonous impact breccia at Haughton. Moderately shocked zircon and monazite grains yield an age distribution consistent with an Archean protolith metamorphosed at ca. 1.9 Ga, whereas shock recrystallized zircon and monazite yield a lower intercept age of 31.8 ± 1.7 Ma (n = 48, MSWD = 0.58, P = 0.99). Four inverse isochron 40Ar/39Ar ages of shocked feldspar clasts yield a weighted mean age of 31.04 ± 0.37 Ma (MSWD = 0.98, P = 0.40), within uncertainty of the U-Pb lower concordia intercept. Ar diffusion modelling supports the interpretation of the impact age and helps resolve impact-driven age resetting. These results highlight the power of coupling multiple geochronologic techniques for determining impact ages, especially from targets with complex geologic histories. Furthermore, they resolve previous discrepancies in the age of the Haughton Dome and the interpretation of the post impact stratigraphy of the crater fill. 2021 Journal Article http://hdl.handle.net/20.500.11937/90162 10.1016/j.gca.2021.04.008 English PERGAMON-ELSEVIER SCIENCE LTD restricted |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics Shock metamorphism Zircon Monazite U-Pb 40Ar/39Ar INDUCED HYDROTHERMAL ACTIVITY CANYON SANIDINE STANDARD SHOCK-WAVE METAMORPHISM K-40 DECAY CONSTANTS DEVON-ISLAND ISOTOPIC COMPOSITION JOINT DETERMINATION IMPROVED ACCURACY ARGON DIFFUSION K-AR Erickson, Timmons Kirkland, Chris Jourdan, Fred Schmieder, M. Hartnady, Michael Cox, Morgan A. Timms, Nick Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title | Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title_full | Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title_fullStr | Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title_full_unstemmed | Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title_short | Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology |
| title_sort | resolving the age of the haughton impact structure using coupled 40ar/39ar and u-pb geochronology |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics Shock metamorphism Zircon Monazite U-Pb 40Ar/39Ar INDUCED HYDROTHERMAL ACTIVITY CANYON SANIDINE STANDARD SHOCK-WAVE METAMORPHISM K-40 DECAY CONSTANTS DEVON-ISLAND ISOTOPIC COMPOSITION JOINT DETERMINATION IMPROVED ACCURACY ARGON DIFFUSION K-AR |
| url | http://hdl.handle.net/20.500.11937/90162 |