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Apatite U-Pb Thermochronology: A Review
Article

Zircon (U-Th)/He Closure Temperature Lower Than Apatite Thermochronometric Systems: Reconciliation of a Paradox

1
Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France
2
GET, Université de Toulouse, CNRS, IRD, UPS, 31400 Toulouse, France
3
Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS B3H 4R2, Canada
4
Université Paris-Saclay, CNRS, GEOPS, 91405 Orsay, France
*
Author to whom correspondence should be addressed.
Academic Editor: Jim Lee
Minerals 2022, 12(2), 145; https://doi.org/10.3390/min12020145
Received: 12 December 2021 / Revised: 19 January 2022 / Accepted: 23 January 2022 / Published: 25 January 2022
(This article belongs to the Special Issue Thermochronology at Temperatures Higher than 150 °C)
Here, we present seven new zircon (U-Th)/He (ZHe) ages and three new zircon fission track (ZFT) ages analyzed from an age-elevation profile (Machu Picchu, Peru). ZFT data present ages older than those obtained with other thermochronological data, whereas the ZHe data interestingly present ages similar to those obtained with apatite (U-Th)/He (AHe). It has been proposed that He retention in zircon is linked to the damage dose, with an evolution of the closure temperature from low values associated with a low α-dose (<1016 α/g), subsequently increasing before decreasing again at a very high α-dose (>1018 α/g). Studies have focused on He diffusion behavior at high α-dose, but little is known at low doses. We propose that the ZHe closure temperature at α-dose ranging from 6 × 1015 to 4 × 1016 α/g is in the range of ~60–80 °C. This value is lower than that proposed in the current damage model ZRDAAM and demonstrates that the ZHe and AHe methods could have similar closure temperatures at low α-dose (i.e., similar ages). These new data strengthen our previous geological conclusions and even highlight a cooling rate approximately twice as important as that deduced from AHe and apatite fission track data alone at Machu Picchu. View Full-Text
Keywords: zircon thermochronometry; α-dose; (U-Th)/He; Andes; Machu Picchu zircon thermochronometry; α-dose; (U-Th)/He; Andes; Machu Picchu
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MDPI and ACS Style

Gérard, B.; Robert, X.; Grujic, D.; Gautheron, C.; Audin, L.; Bernet, M.; Balvay, M. Zircon (U-Th)/He Closure Temperature Lower Than Apatite Thermochronometric Systems: Reconciliation of a Paradox. Minerals 2022, 12, 145. https://doi.org/10.3390/min12020145

AMA Style

Gérard B, Robert X, Grujic D, Gautheron C, Audin L, Bernet M, Balvay M. Zircon (U-Th)/He Closure Temperature Lower Than Apatite Thermochronometric Systems: Reconciliation of a Paradox. Minerals. 2022; 12(2):145. https://doi.org/10.3390/min12020145

Chicago/Turabian Style

Gérard, Benjamin, Xavier Robert, Djordje Grujic, Cécile Gautheron, Laurence Audin, Matthias Bernet, and Mélanie Balvay. 2022. "Zircon (U-Th)/He Closure Temperature Lower Than Apatite Thermochronometric Systems: Reconciliation of a Paradox" Minerals 12, no. 2: 145. https://doi.org/10.3390/min12020145

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