LA-MC-ICPMS Pb–Pb dating of rutile from slowly cooled granulites: Confirmation of the high closure temperature for Pb diffusion in rutile

Vry, J. K.; Baker, Joel A.

doi:10.1016/j.gca.2005.12.006

Cited by 160 publications

(84 citation statements)

References 53 publications

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“…Rutile has been shown to be capable of robustly preserving Zr-in-rutile temperatures from granulite facies or ultrahigh-temperature conditions (e.g. Baldwin and Brown 2008;Ewing et al 2013;Kooijman et al 2012;Luvizotto and Zack 2009), but the U-Pb system in rutile is expected to record cooling through significantly lower temperatures of 500-650 °C (Cherniak 2000;Kooijman et al 2010;Vry and Baker 2006). The common occurrence of rutile in some lower crustal lithologies combined with its moderate closure temperature for Pb make U-Pb geochronology of rutile ideally placed to investigate the post-peak thermal evolution of the lower crust during cooling and exhumation.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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documented along the western margin of the Adriatic plate. The ~160 Ma age population postdates the activity of all known rift-related structures within the Adriatic margin, but coincides with extensive gabbroic magmatism and exhumation of sub-continental mantle to the floor of the Alpine Tethys, west of the Ivrea Zone. We propose that this ~160 Ma early post-rift age population records regional cooling following episodic heating of the distal Adriatic margin, likely related to extreme lithospheric thinning and associated advection of the asthenosphere to shallow levels. The partial preservation of the ~175 Ma age cluster suggests that the post-rift (~160 Ma) heating pulse was of short duration. The regional consistency of the data presented here, which is in contrast to many other thermochronometers in the IVZ, demonstrates the value of the rutile U-Pb technique for probing the thermal evolution of high-grade metamorphic terrains. In the IVZ, a significant decoupling between Zr-in-rutile temperatures and U-Pb ages of rutile is observed, with the two systems recording events ~120 Ma apart.

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Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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“…Zack et al (2004a) constrain concentration ranges for Nb and Cr, which discriminate rutile deriving from pelitic or mafic source rocks. High U contents provide the opportunity to apply U/Pb-or (U-Th)/ He dating techniques (e.g., Mezger et al 1989;Vry et al 2003;Vry and Baker 2006;Stockli et al 2007). Further work addresses the applicability of the rutile thermometer (Spear et al 2006;Zack and Luvizotto 2006;Triebold et al 2007;) and lithology discrimination using Nb and Cr contents (Triebold et al 2007;Meinhold et al 2008;).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Discrimination of TiO2 polymorphs in sedimentary and metamorphic rocks

Triebold¹,

Luvizotto

Tolosana‐Delgado

et al. 2010

Contrib Mineral Petrol

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Investigation by Raman spectroscopy of samples from different geological settings shows that the occurrence of TiO 2 polymorphs other than rutile can hardly be predicted, and furthermore, the occurrence of anatase is more widespread than previously thought. Metamorphic pressure and temperature, together with whole rock chemistry, control the occurrence of anatase, whereas variation of mineral assemblage characteristics and/or fluid occurrence or composition takes influence on anatase trace element characteristics and re-equilibration of relict rutiles.Evaluation of trace element contents obtained by electron microprobe in anatase, brookite, and rutile shows that these vary significantly between the three TiO 2 phases. Therefore, on the one hand, an appropriation to source rock type according to Nb and Cr contents, but as well application of thermometry on the basis of Zr contents, would lead to erroneous results if no phase specification is done beforehand. For the elements Cr, V, Fe, and Nb, variation between the polymorphs is systematic and can be used for discrimination on the basis of a linear discriminant analysis. Using phase group means and coefficients of linear discriminants obtained from a compilation of analyses from samples with well-defined phase information together with prior probabilities of groupings from a natural sample compilation, one is able to calculate phase grouping probabilities of any TiO 2 analysis containing at least the critical elements Cr, V, Fe, and Nb. An application of this calculation shows that for the appropriation to the phase rutile, a correct-classification rate of 99.5% is obtained. Hence, phase specification by trace elements proves to be a valuable tool besides Raman spectroscopy.

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“…However, this oxide does not necessarily contain enough uranium -and no Th -and thus its radiogenic signal may be too weak to be measured accurately. The concentration of U in rutile is particularly low in mafic rocks (i.e., eclogites), whereas rutile in metasediments and granitoids can be richer in U, especially if metamorphosed at high temperature (Vry and Baker 2006;Kooijman et al 2010;Ewing et al 2013). Because rutile does not seem to preserve metamorphic growth stages, it is suitable for bulk dating by isotope dilution thermal ionization mass spectrometer (TIMS) that can achieve better precision.…”

Section: Methodsmentioning

confidence: 99%

Uranium-Lead, Metamorphic Rocks

Rubatto

2013

Encyclopedia of Scientific Dating Methods

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Definition: The word metamorphism derives from the Greek word "metamorphosis," meaning change of form. Metamorphism is the process by which the mineralogy of rocks is changed as the result of pressure and temperature according to their composition and with the aid of fluid and deformation. Metamorphism is mainly concerned with the changes that take place when rocks are in the solid state, even though melt can be one of the phases present.

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LA-MC-ICPMS Pb–Pb dating of rutile from slowly cooled granulites: Confirmation of the high closure temperature for Pb diffusion in rutile

Cited by 160 publications

References 53 publications

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Discrimination of TiO2 polymorphs in sedimentary and metamorphic rocks

Uranium-Lead, Metamorphic Rocks

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