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In search of lost time: raman thermochronology of FC-1 zircon

Translating thermochronological ages to geological models requires knowledge of the thermal sensitivity of the applied thermochronometer, i.e. the closure temperature or the partial annealing/retention zone. Zircon Raman dating is a thermochronometer that uses radiation-damage measurements and match...

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Hauptverfasser: Härtel, Birk (VerfasserIn) , Enkelmann, Eva (VerfasserIn) , Jonckheere, Raymond (VerfasserIn) , Ludwig, Thomas (VerfasserIn) , Krause, Joachim (VerfasserIn) , Ratschbacher, Lothar (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: January 2024
In: Contributions to mineralogy and petrology
Year: 2024, Jahrgang: 179, Heft: 1, Pages: 1-15
ISSN:1432-0967
DOI:10.1007/s00410-023-02083-z
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s00410-023-02083-z
Verlag, lizenzpflichtig, Volltext: https://link.springer.com/article/10.1007/s00410-023-02083-z
Volltext
Verfasserangaben:Birk Hartel, Eva Enkelmann, Raymond Jonckheere, Thomas Ludwig, Joachim Krause & Lothar Ratschbacher

MARC

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520 |a Translating thermochronological ages to geological models requires knowledge of the thermal sensitivity of the applied thermochronometer, i.e. the closure temperature or the partial annealing/retention zone. Zircon Raman dating is a thermochronometer that uses radiation-damage measurements and matched analyses of actinide contents in zircon. Experimental work placed its closure temperature at 330-370 degrees C for the internal nu(2)(SiO4) and nu(3)(SiO4) Raman bands at 439 and 1008 cm(-1), and 260-310 degrees C for the external rotation (ER) band at 356 cm(-1). However, experimental annealing models also predict partial radiation-damage annealing over a broad temperature range (> 500 degrees C). We test these closure temperatures by dating zircon from the U-Pb reference material FC-1. We matched Raman-based radiation-damage measurements with U and Th concentrations measured with a secondary ion mass spectrometer. The zircon Raman ages for the nu(2), nu(3), and ER bands are 942 +/- 23 Ma (2 s), 978 +/- 38 Ma, and 1033 +/- 32 Ma. This is lower than the expected range of 1040-1080 Ma, between the apatite U-Pb (similar to 490 degrees C) and zircon (U-Th)/He (ZHe; similar to 200 degrees C) ages. We discuss long-term, low-temperature annealing of radiation damage during protracted cooling of the sample as a cause of age reduction. This explanation fits both, experimental annealing models and zircon Raman data from other geological settings. Long-term, low-temperature annealing complicates the interpretation of standalone zircon Raman data. However, exploiting this effect by combining zircon Raman and ZHe dating on the same sample provides thermal-history information beyond that revealed by either of them. 
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650 4 |a (U-TH)/HE THERMOCHRONOMETRY 
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650 4 |a Closure temperature 
650 4 |a HE DIFFUSION 
650 4 |a HELIUM DIFFUSION 
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650 4 |a PARTIALLY METAMICT ZIRCON 
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650 4 |a Radiation-damage annealing 
650 4 |a RADIOACTIVITY-INDUCED DAMAGE 
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