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Testing models of orogen exhumation using zircon (U–Th)/He thermochronology: Insight from the Ligurian Alps, Northern Italy

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Title: Testing models of orogen exhumation using zircon (U–Th)/He thermochronology: Insight from the Ligurian Alps, Northern Italy
Authors: Maino, Matteo1 matteo.maino@unipv.it, Dallagiovanna, Giorgio1, Dobson, Katherine J.2, Gaggero, Laura3, Persano, Cristina2, Seno, Silvio1, Stuart, Finlay M.4
Source: Tectonophysics. Aug2012, Vol. 560-561, p84-93. 10p.
Subjects: Orogeny, Geological time scales, Helium, Zircon, Plate tectonics
Geographic Terms: Ligurian Alps (Italy), Northern Italy
Abstract: Abstract: Testing models of orogen exhumation requires precise constraint of the time–temperature paths of the exhumed rocks. The zircon (U–Th)/He (ZHe) thermochronometer has a closure temperature of ~140–210°C, and can provide temporal constraints on the exhumation history of rocks through a thermal range which crucially corresponds the onset of brittle behaviour of an exhuming orogen. We performed ZHe analyses to test the existing contradictory models for the exhumation of the Ligurian Alps. The ZHe ages indicate a very rapid (1.3–6.8mm/yr) and southward migrating exhumation of the orogen between ~32 and 25Ma. These high exhumation rates are unique within the Alpine belt and cannot be reconciled with existing geodynamic models of the evolution of the Ligurian Alps. We propose a model of tectonic denudation via detachment accomplished in the shallowest crust (<5km) as a result of the last orogenic phase of extension. [Copyright &y& Elsevier]
Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Abstract: Testing models of orogen exhumation requires precise constraint of the time–temperature paths of the exhumed rocks. The zircon (U–Th)/He (ZHe) thermochronometer has a closure temperature of ~140–210&#176;C, and can provide temporal constraints on the exhumation history of rocks through a thermal range which crucially corresponds the onset of brittle behaviour of an exhuming orogen. We performed ZHe analyses to test the existing contradictory models for the exhumation of the Ligurian Alps. The ZHe ages indicate a very rapid (1.3–6.8mm/yr) and southward migrating exhumation of the orogen between ~32 and 25Ma. These high exhumation rates are unique within the Alpine belt and cannot be reconciled with existing geodynamic models of the evolution of the Ligurian Alps. We propose a model of tectonic denudation via detachment accomplished in the shallowest crust (&lt;5km) as a result of the last orogenic phase of extension. [Copyright &amp;y&amp; Elsevier]
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  Data: &lt;i&gt;Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.tecto.2012.06.045
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 84
    Subjects:
      – SubjectFull: Orogeny
        Type: general
      – SubjectFull: Geological time scales
        Type: general
      – SubjectFull: Helium
        Type: general
      – SubjectFull: Zircon
        Type: general
      – SubjectFull: Plate tectonics
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      – SubjectFull: Ligurian Alps (Italy)
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      – SubjectFull: Northern Italy
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      – TitleFull: Testing models of orogen exhumation using zircon (U–Th)/He thermochronology: Insight from the Ligurian Alps, Northern Italy
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              Text: Aug2012
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              Y: 2012
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              Value: 560-561
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