Zircon (U-Th)/He closure temperature lower than apatite thermochronometric systems : reconciliation of a paradox

Gerard, B.; /Robert, Xavier; Grujic, D.; Gautheron, C.; /Audin, Laurence; Bernet, M.; Balvay, M.

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dc.creator	Gerard, B.
dc.creator	/Robert, Xavier
dc.creator	Grujic, D.
dc.creator	Gautheron, C.
dc.creator	/Audin, Laurence
dc.creator	Bernet, M.
dc.creator	Balvay, M.
dc.date	2022
dc.date.accessioned	2022-04-27T17:37:47Z
dc.date.available	2022-04-27T17:37:47Z
dc.identifier	https://www.documentation.ird.fr/hor/fdi:010084512
dc.identifier	oai:ird.fr:fdi:010084512
dc.identifier	Gerard B., Robert Xavier, Grujic D., Gautheron C., Audin Laurence, Bernet M., Balvay M.. Zircon (U-Th)/He closure temperature lower than apatite thermochronometric systems : reconciliation of a paradox. 2022, 12 (2), 145 [14 p.]
dc.identifier.uri	http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/169089
dc.description	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 alpha-dose (< 10(16) alpha/g), subsequently increasing before decreasing again at a very high alpha-dose (> 10(18) alpha/g). Studies have focused on He diffusion behavior at high alpha-dose, but little is known at low doses. We propose that the ZHe closure temperature at alpha-dose ranging from 6 x 10(15) to 4 x 10(16) alpha/g is in the range of ~60-80 & DEG;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 alpha-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.
dc.language	EN
dc.subject	zircon thermochronometry
dc.subject	a-dose
dc.subject	(U-Th)/He
dc.subject	Andes
dc.subject	Machu Picchu
dc.title	Zircon (U-Th)/He closure temperature lower than apatite thermochronometric systems : reconciliation of a paradox
dc.type	text
dc.coverage	PEROU
dc.coverage	ANDES