Rutile U-Pb age depth profiling: A continuous record of lithospheric thermal evolution

Andrew J. Smye, Daniel F. Stockli

Research output: Contribution to journalArticle

47 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)171-182
Number of pages12
JournalEarth and Planetary Science Letters
Volume408
DOIs
StatePublished - Dec 5 2014

Fingerprint

Depth profiling
thermal evolution
rutile
profiles
ablation
histories
lithosphere
inversions
history
laser
laser ablation
Laser ablation
thermochronology
Bearings (structural)
age structure
accessories
inductively coupled plasma mass spectrometry
lower crust
topology
continental crust

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

@article{16eed6987c4141fba247005b4ca2f0fb,
title = "Rutile U-Pb age depth profiling: A continuous record of lithospheric thermal evolution",
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.",
author = "Smye, {Andrew J.} and Stockli, {Daniel F.}",
year = "2014",
month = "12",
day = "5",
doi = "10.1016/j.epsl.2014.10.013",
language = "English (US)",
volume = "408",
pages = "171--182",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

Rutile U-Pb age depth profiling : A continuous record of lithospheric thermal evolution. / Smye, Andrew J.; Stockli, Daniel F.

In: Earth and Planetary Science Letters, Vol. 408, 05.12.2014, p. 171-182.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Rutile U-Pb age depth profiling

T2 - A continuous record of lithospheric thermal evolution

AU - Smye, Andrew J.

AU - Stockli, Daniel F.

PY - 2014/12/5

Y1 - 2014/12/5

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84908577459&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84908577459&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2014.10.013

DO - 10.1016/j.epsl.2014.10.013

M3 - Article

AN - SCOPUS:84908577459

VL - 408

SP - 171

EP - 182

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -