Influence of radiation damage on titanite He diffusion kinetics

Baughman, Jaclyn S.; Flowers, Rebecca M.; Metcalf, James R.; Dhansay, Taufeeq

doi:10.1016/j.gca.2017.01.049

Cited by 41 publications

(59 citation statements)

References 64 publications

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“…Radiation damage impacts He diffusivity in apatite (Flowers et al, ; Gautheron et al, ; Gerin et al, ; Recanati et al, ; Shuster et al, ; Shuster & Farley, ; Willett et al, ), titanite (Baughman et al, ; Guenthner et al, ), and zircon (Ginster et al, ; Guenthner et al, ; Hurley, ; Reiners, ). Provided grains experience the same thermal history, the measured effective U concentration (eU, where eU is calculated as [U] + 0.234 * [Th] + 0.0046 * [Sm]; Gastil et al, ) corresponds to relative radiation damage.…”

Section: Advances In Thermochronometry Systematicsmentioning

confidence: 99%

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Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

2019

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A transformative advance in Earth science is the development of low‐temperature thermochronometry to date Earth surface processes or quantify the thermal evolution of rocks through time. Grand challenges and new directions in low‐temperature thermochronometry involve pushing the boundaries of these techniques to decipher thermal histories operative over seconds to hundreds of millions of years, in recent or deep geologic time and from the perspective of atoms to mountain belts. Here we highlight innovation in bedrock and detrital fission track, (U–Th)/He, and trapped charge thermochronometry, as well as thermal history modeling that enable fresh perspectives on Earth science problems. These developments connect low‐temperature thermochronometry tools with new users across Earth science disciplines to enable transdisciplinary research. Method advances include radiation damage and crystal chemistry influences on fission track and (U–Th)/He systematics, atomistic calculations of He diffusion, measurement protocols and numerical modeling routines in trapped charge systematics, development of 4He/3He and new (U–Th)/He thermochronometers, and multimethod approaches. New applications leverage method developments and include quantifying landscape evolution at variable temporal scales, changes to Earth's surface in deep geologic time and connections to mantle processes, the spectrum of fault processes from paleoearthquakes to slow slip and fluid flow, and paleoclimate and past critical zone evolution. These research avenues have societal implications for modern climate change, groundwater flow paths, mineral resource and petroleum systems science, and earthquake hazards.

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Section: Advances In Thermochronometry Systematicsmentioning

confidence: 99%

“…High eU zircon He dates can be younger than apatite He dates reflecting low T c . Titanite He dates similarly yield an inverse date‐eU relationship and older dates owing to lower eU values and higher T c (Baughman et al, ; Guenthner et al, ).…”

Section: Advances In Thermochronometry Systematicsmentioning

confidence: 99%

Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

2019

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“…Advances in (U‐Th)/He thermochronology provide new potential to address this problem. The strong influence of radiation damage on the He retentivity of apatite, zircon, and titanite means that (U‐Th)/He data for these phases can be used to decipher cooling through wide temperature ranges (e.g., Baughman et al, ; Flowers et al, ; Gautheron et al, ; Guenthner et al, ; Orme et al, ; Powell et al, ; Shuster et al, ). For example, zircon and titanite (U‐Th)/He (ZHe, THe) closure temperatures (T c ) can vary by up to 180°C owing to this effect (Guenthner et al, ; Baughman et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…In zircon, the addition of damage causes the T c to initially increase from 150 to 200°C until a percolation threshold is reached at which point the T c can drop to <50°C (Guenthner et al, ; Ketcham et al, ). The radiation damage effect on titanite is similar to zircon, with a T c of ∼180°C at low damage and a dramatic reduction in He retentivity above a damage percolation threshold (Baughman et al, ). Radiation damage can be annealed by heating, which can partly or fully reverse the effects of radiation damage on He retentivity (e.g., Ketcham et al, ; Shuster & Farley, ).…”

Section: Introductionmentioning

confidence: 99%

“…Thermochronologic constraints on the tT history in the intervening time are limited. These data include five Neoproterozoic titanite fission‐track dates from the southeastern craton (Jacobs & Thomas, ), a suite of 1,200 to 20 Ma THe dates negatively correlated with eU from Archean basement samples across the central, eastern and northern craton (Baughman et al, ; Flowers & Schoene, ), and plagioclase 40 Ar/ 39 Ar data for a single sample from the Bushveld complex interpreted to record initially rapid cooling to < 300°C followed by protracted cooling to temperatures of 150–200°C by ∼1.4 Ga (Cassata et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Deciphering a 2 Gyr‐Long Thermal History From a Multichronometer (U‐Th)/He Study of the Phalaborwa Carbonatite, Kaapvaal Craton, South Africa

Baughman

Flowers

2018

Geochem Geophys Geosyst

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(U‐Th)/He data were obtained for four minerals (baddeleyite‐BHe, titanite‐THe, zircon‐ZHe, apatite‐AHe) from the 2.06 Ga Phalaborwa carbonatite complex and nearby Archean basement of the Kaapvaal craton, South Africa. Our goals are to evaluate the relative He temperature sensitivities of these phases, better understand how radiation damage and other factors affect them, and inform aspects of the craton's thermal history. BHe dates overlap with Phalaborwa emplacement and record the highest temperatures of the dated phases. THe dates are 700–1,100 Ma and display a limited negative date‐eU correlation. ZHe dates are negatively correlated with eU, are younger (561–32 Ma) and have higher eU than the THe data, with the highest‐eU grains younger than the AHe dates. AHe dates are reproducible with a mean of 107 ± 7 Ma. The THe and ZHe data show radiation damage reduction of their He retentivities manifested as the negative date‐eU correlations. Alpha dose estimates for zircon are several orders of magnitude higher than for titanite, consistent with the ZHe dates recording lower temperatures and a younger portion of the history than the THe dates. Thermal history modeling yields time‐temperature paths that (1) explain the AHe, ZHe, and THe data while honoring existing geologic constraints, thus demonstrating the internal consistency of the data set, (2) imply possible reheating during Namaqua‐Natal orogenesis, and (3) limit maximum probable temperatures to ∼180°C during 300–183 Ma Karoo basin burial. The results show that exploiting multiple (U‐Th)/He thermochronometers and radiation damage effects can provide new insights into long‐term craton evolution.

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Zircon, titanite, and apatite (U‐Th)/He ages and age‐eU correlations from the Fennoscandian Shield, southern Sweden

et al. 2017

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Craton cores far from plate boundaries have traditionally been viewed as stable features that experience minimal vertical motion over 100–1000 Ma time scales. Here we show that the Fennoscandian Shield in southeastern Sweden experienced several episodes of burial and exhumation from ~1800 Ma to the present. Apatite, titanite, and zircon (U‐Th)/He ages from surface samples and drill cores constrain the long‐term, low‐temperature history of the Laxemar region. Single grain titanite and zircon (U‐Th)/He ages are negatively correlated (104–838 Ma for zircon and 160–945 Ma for titanite) with effective uranium (eU = U + 0.235 × Th), a measurement proportional to radiation damage. Apatite ages are 102–258 Ma and are positively correlated with eU. These correlations are interpreted with damage‐diffusivity models, and the modeled zircon He age‐eU correlations constrain multiple episodes of heating and cooling from 1800 Ma to the present, which we interpret in the context of foreland basin systems related to the Neoproterozoic Sveconorwegian and Paleozoic Caledonian orogens. Inverse time‐temperature models constrain an average burial temperature of ~217°C during the Sveconorwegian, achieved between 944 Ma and 851 Ma, and ~154°C during the Caledonian, achieved between 366 Ma and 224 Ma. Subsequent cooling to near‐surface temperatures in both cases could be related to long‐term exhumation caused by either postorogenic collapse or mantle dynamics related to the final assembly of Rodinia and Pangaea. Our titanite He age‐eU correlations cannot currently be interpreted in the same fashion; however, this study represents one of the first examples of a damage‐diffusivity relationship in this system, which deserves further research attention.

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Influence of radiation damage on titanite He diffusion kinetics

Cited by 41 publications

References 64 publications

Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

Deciphering a 2 Gyr‐Long Thermal History From a Multichronometer (U‐Th)/He Study of the Phalaborwa Carbonatite, Kaapvaal Craton, South Africa

Zircon, titanite, and apatite (U‐Th)/He ages and age‐eU correlations from the Fennoscandian Shield, southern Sweden

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