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- W1992299833 abstract "Understanding of the thermal and geophysical evolution of the lower continental crust is limited by the resolution of conventional thermochronology. Intracrystalline daughter nuclide distribution profiles preserve a rich and underutilized record of thermal history. Using Laser Ablation Inductively Coupled Plasma Mass Spectrometry, we outline here a method to simultaneously acquire 206Pb/238U age and trace element profiles from U-bearing accessory phases. Inversion of 206Pb/238U age depth profiles yields thermal history information from an extended temperature range compared to inversion of age versus grain size relationships. Thermally-activated volume diffusion of Pb and Zr in rutile is sensitive to the thermal evolution of the mid- to lower-lithosphere. We document the ability of Laser Ablation depth-profiling to simultaneously resolve 206Pb/238U age and Zr diffusion profiles in the outer ∼35μm of lower-crustal rutile euhedra from the Ivrea Zone, Southern Alps, with <1.2μm depth resolution. Inversion of the age profiles reveals a continuous cooling history characterized by initially rapid cooling from >600°C at ∼180Ma followed by a period of slower cooling from ∼525°C to ∼450°C. Combined with the topology of Zr diffusion profiles, these data indicate that the Ivrea Zone underwent a brief thermal pulse in the early Jurassic, plausibly associated with hyperextension of the Adriatic margin. Inversion of near-surface 206Pb/238U age distributions can be employed to resolve otherwise inaccessible thermal history information from the lower lithosphere." @default.
- W1992299833 created "2016-06-24" @default.
- W1992299833 creator A5025296095 @default.
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- W1992299833 date "2014-12-01" @default.
- W1992299833 modified "2023-10-16" @default.
- W1992299833 title "Rutile U–Pb age depth profiling: A continuous record of lithospheric thermal evolution" @default.
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- W1992299833 doi "https://doi.org/10.1016/j.epsl.2014.10.013" @default.
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