Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc
Abstract Exhumation of plutonic systems is driven by a range of mechanisms including isostatic, tectonic, and erosional processes. Variable rates of plutonic exhumation in active subduction systems may be driven by idiosyncrasies of regional geology or by first‐order tectonic features. We report new...
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| Format: | Article |
| Language: | English |
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Wiley
2019-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2018GL080579 |
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| author | C. J. Spencer M. Danišík H. Ito C. Hoiland S. Tapster H. Jeon B. McDonald N. J. Evans |
| author_facet | C. J. Spencer M. Danišík H. Ito C. Hoiland S. Tapster H. Jeon B. McDonald N. J. Evans |
| author_sort | C. J. Spencer |
| collection | DOAJ |
| description | Abstract Exhumation of plutonic systems is driven by a range of mechanisms including isostatic, tectonic, and erosional processes. Variable rates of plutonic exhumation in active subduction systems may be driven by idiosyncrasies of regional geology or by first‐order tectonic features. We report new age, isotope, and low‐temperature thermochronology constraints of granitoids from the Hida Mountains of central Japan that constrain the highest rates and magnitude of plutonic rock exhumation within the Japan and one of the highest worldwide. This extreme exhumation is centered on the apex of a lithospheric scale anticlinorium associated with the subduction of the Izu‐Bonin oceanic arc. The spatial and temporal relationship between the exhumation of these Pleistocene plutons and the subducting/accreting Izu‐Bonin oceanic arc links the plate‐scale geodynamics and regional exhumation patterns. Identifying thermochronological anomalies within magmatic arcs provides an opportunity to identify ancient asperities previously subducted and responsible for rapid exhumation rates within ancient subduction systems. |
| format | Article |
| id | doaj-art-3debf87494d449a5a702dd9387e4c007 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-3debf87494d449a5a702dd9387e4c0072025-08-20T01:51:45ZengWileyGeophysical Research Letters0094-82761944-80072019-02-014631259126710.1029/2018GL080579Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic ArcC. J. Spencer0M. Danišík1H. Ito2C. Hoiland3S. Tapster4H. Jeon5B. McDonald6N. J. Evans7Earth Dynamics Research Group, The Institute of Geoscience Research, School of Earth and Planetary Sciences Curtin University Perth Western Australia AustraliaJohn de Laeter Centre, The Institute of Geoscience Research Curtin University Perth Western Australia AustraliaGeosphere Science Sector Central Research Institute of Electric Power Industry Chiba JapanDepartment of Geological Sciences Stanford University Stanford CA USANERC Isotope Geosciences Facilities British Geological Survey Nottingham UKCentre for Microscopy, Characterisation and Analysis University of Western Australia Perth Western Australia AustraliaJohn de Laeter Centre, The Institute of Geoscience Research Curtin University Perth Western Australia AustraliaEarth Dynamics Research Group, The Institute of Geoscience Research, School of Earth and Planetary Sciences Curtin University Perth Western Australia AustraliaAbstract Exhumation of plutonic systems is driven by a range of mechanisms including isostatic, tectonic, and erosional processes. Variable rates of plutonic exhumation in active subduction systems may be driven by idiosyncrasies of regional geology or by first‐order tectonic features. We report new age, isotope, and low‐temperature thermochronology constraints of granitoids from the Hida Mountains of central Japan that constrain the highest rates and magnitude of plutonic rock exhumation within the Japan and one of the highest worldwide. This extreme exhumation is centered on the apex of a lithospheric scale anticlinorium associated with the subduction of the Izu‐Bonin oceanic arc. The spatial and temporal relationship between the exhumation of these Pleistocene plutons and the subducting/accreting Izu‐Bonin oceanic arc links the plate‐scale geodynamics and regional exhumation patterns. Identifying thermochronological anomalies within magmatic arcs provides an opportunity to identify ancient asperities previously subducted and responsible for rapid exhumation rates within ancient subduction systems.https://doi.org/10.1029/2018GL080579U‐Pb geochronologythermochronologyJapanexhumationsubduction |
| spellingShingle | C. J. Spencer M. Danišík H. Ito C. Hoiland S. Tapster H. Jeon B. McDonald N. J. Evans Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc Geophysical Research Letters U‐Pb geochronology thermochronology Japan exhumation subduction |
| title | Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc |
| title_full | Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc |
| title_fullStr | Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc |
| title_full_unstemmed | Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc |
| title_short | Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc |
| title_sort | rapid exhumation of earth s youngest exposed granites driven by subduction of an oceanic arc |
| topic | U‐Pb geochronology thermochronology Japan exhumation subduction |
| url | https://doi.org/10.1029/2018GL080579 |
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