Chemical influence on α-recoil damage annealing in apatite: Implications for (U–Th)/He dating

Gautheron, Cécile; Barbarand, Jocelyn; Ketcham, Richard A.; Tassan‐Got, L.; Beek, Peter van der; Pagel, Maurice; Pinna-Jamme, Rosella; Couffignal, Frédéric; Fialin, Michel

doi:10.1016/j.chemgeo.2013.05.027

Cited by 104 publications

(90 citation statements)

References 45 publications

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“…The Ketcham et al (2007) and Gautheron et al (2013b) and He diffusion coefficient of this study, for the same thermal history that the one used in Fig. 9.…”

Section: Conclusion and Implications For The Apatite (U-th)/he Thermomentioning

confidence: 96%

“…Here the eU content or the track density are used as a proxy of the recoil damage, which acts as He traps and modifies He retentivity with the amount of damage (Flowers et al, 2009;Gautheron et al, 2009). Damage anneals according to a law inferred from fission-track annealing in apatite (Ketcham et al, 2007) and for both models we used an annealing rate corresponding to rmr 0 of 0.83 and 0.53 for F-and Cl 0.25 -apatite, respectively (Gautheron et al, 2013b). The results are reported in Fig 10. The difference in damage annealing between the two apatite lattices is not significant for this particular thermal history, as the temperature remains for a long time too low to anneal.…”

Section: Impact On (U-th)/he Agesmentioning

confidence: 99%

“…In addition the apatite chemical composition such as the Cl content may also act by impacting the damage-annealing rate (Ketcham et al, 2007;Gautheron et al, 2013b). This latter effect can impact strongly the AHe ages for typical grain chemistry population by creating dispersion in the 10% order magnitude range for simple slow cooled samples, and up to more than 100% for reheated samples in the He partial retention zone (60-100°C; see Gautheron et al, 2013b). AHe age dispersion coming from the annealing rate occur for sedimentary samples members of a broad population and spanning a large range of chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Impact of apatite chemical composition on (U-Th)/He thermochronometry: An atomistic point of view

Djimbi

Gautheron

Roques

et al. 2015

Geochimica et Cosmochimica Acta

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“…The Ketcham et al (2007) and Gautheron et al (2013b) and He diffusion coefficient of this study, for the same thermal history that the one used in Fig. 9.…”

Section: Conclusion and Implications For The Apatite (U-th)/he Thermomentioning

confidence: 96%

Section: Impact On (U-th)/he Agesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of apatite chemical composition on (U-Th)/He thermochronometry: An atomistic point of view

Djimbi

Gautheron

Roques

et al. 2015

Geochimica et Cosmochimica Acta

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“…More details on He, U, Th, and Sm content determination can been found in Gautheron et al . []. The analysis was calibrated using internal and external age standards.…”

Section: Methodsmentioning

confidence: 99%

Postrift history of the eastern central Atlantic passive margin: Insights from the Saharan region of South Morocco

et al. 2015

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The passive margin of South Morocco is a low-elevated passive margin. It constitutes one of the oldest margins of the Atlantic Ocean, with an Early Jurassic breakup, and little geological data are available concerning its postrift reactivation so far. We investigated the postrift thermal history of the onshore part of the margin with low-temperature thermochronology on apatite crystals. Fission track and (U-Th-Sm)/He ages we obtained are significantly younger than the breakup (~190 Ma). Fission track ages range from 107 ± 8 to 175 ± 16 Ma, with mean track lengths from 10.7 ± 0.3 to 12.5 ± 0.2 μm. (U-Th-Sm)/He ages range from 14 ± 1 to 185 ± 15 Ma. Using inverse modeling of low-temperature thermochronological data, we demonstrate that the South Moroccan continental margin underwent a complex postrift history with at least two burial and exhumation phases. The first exhumation event occurred during Late Jurassic/Early Cretaceous, and we attribute this to mantle dynamics rather than to intrinsic rifting-related processes such as flexural rebound. The second event, from Late Cretaceous to early Paleogene, might record the onset of Africa/Europe convergence. We show a remarkably common behavior of the whole Moroccan passive margin during its early postrift evolution. The present-day differences result from a segmentation of the margin domains due to the Africa/Europe convergence. Finally we propose that varying retained strengths during rifting and also the specific crustal/lithospheric geometry of stretching explain the difference between the topographical expressions on the continental African margin compared to its American counterpart.

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“…Defining a nominal closure temperature for the apatite (U‐Th‐Sm)/He dating system has proven to be challenging [ Fitzgerald et al ., ]. Depending on the size of the apatite crystal (i.e., the diffusion domain) and the amount of accumulated radiation damage, the temperature range between total retention of helium and complete diffusive loss of helium can vary from 40 to 120°C [ Gautheron et al ., ]. Depending on the cooling history through this partial retention zone, variations in closure temperature can result in intrasample single‐grain AHe ages being significantly dispersed [ Brown et al ., ].…”

Section: Apatite Fission Track and (U‐th‐sm)/he Analysismentioning

confidence: 99%

Contrasting Mesozoic evolution across the boundary between on and off craton regions of the South African plateau inferred from apatite fission track and (U‐Th‐Sm)/He thermochronology

et al. 2017

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The timing and mechanisms involved in creating the elevated, low‐relief topography of the South African plateau remain unresolved. Here we constrain the thermal history of the Southwest African plateau since 300 Ma by using apatite fission track (AFT) and (U‐Th‐Sm)/He (AHe) thermochronology. Archean rocks from the center of the Kaapvaal Craton yield AFT ages of 331.0 ± 11.0 and 379.0 ± 23.0 Ma and mean track lengths (MTLs) of 11.9 ± 0.2 and 12.5 ± 0.3 µm. Toward the southwest margin of the craton and in the adjacent Paleozoic mobile belt, AFT ages are significantly younger and range from 58.9 ± 5.9 to 128.7 ± 6.3 Ma and have longer MTLs (>13 µm). The range of sample AHe ages complements the AFT ages, and single‐grain AHe ages for most samples are highly dispersed. Results from joint inverse modeling of these data reveal that the center of the craton has resided at near‐surface temperatures (<60°C) since 300 Ma, whereas the margins of the craton and the off‐craton mobile belt experienced two discrete episodes of cooling during the Cretaceous. An Early Cretaceous cooling episode is ascribed to regional denudation following continental breakup. Late Cretaceous cooling occurs regionally but is locally variable and may be a result of a complex interaction between mantle‐driven uplift and the tectonic setting of the craton margin. Across the entire plateau, samples are predicted to have remained at near‐surface temperatures throughout the Cenozoic, suggesting minimal denudation (<1 km) and relative tectonic stability of the plateau.

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Chemical influence on α-recoil damage annealing in apatite: Implications for (U–Th)/He dating

Cited by 104 publications

References 45 publications

Impact of apatite chemical composition on (U-Th)/He thermochronometry: An atomistic point of view

Impact of apatite chemical composition on (U-Th)/He thermochronometry: An atomistic point of view

Postrift history of the eastern central Atlantic passive margin: Insights from the Saharan region of South Morocco

Contrasting Mesozoic evolution across the boundary between on and off craton regions of the South African plateau inferred from apatite fission track and (U‐Th‐Sm)/He thermochronology

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