Mapping radiation damage zoning in zircon using Raman spectroscopy: Implications for zircon chronology

Anderson, Alyssa J.; Hanchar, John M.; Hodges, Kip; Soest, M. C. van

doi:10.1016/j.chemgeo.2020.119494

Cited by 32 publications

(17 citation statements)

References 65 publications

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“…This loss of damage with temperature and time is a problem for the interpretation of zircon Raman dates as crystallization ages (Nasdala et al, 2001(Nasdala et al, , 2002 but unlocks the potential for determining cooling ages and analyzing the thermal histories of natural zircon samples (Resentini et al, 2020). Annealing of radiation damage also affects He diffusion and is thus a process that needs to be taken into account in the interpretation of (U-Th) / He dates of zircon (Ginster et al, 2019;Anderson et al, 2020). Since the Raman analysis of zircon is non-destructive, there is a high potential for including zircon Raman dating into a multi-method geochronological workflow on zircon.…”

Section: Introductionmentioning

confidence: 99%

The closure temperature(s) of zircon Raman dating

et al. 2021

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Abstract. Zircon Raman dating based on irradiation damage is a debated concept but not an established geo-/thermochronological method. One issue is the temperature range of radiation-damage annealing over geological timescales. We conducted isochronal and isothermal annealing experiments on radiation-damaged zircons between 500 and 1000 ∘C for durations between 10 min and 5 d to describe the annealing kinetics. We measured the widths (Γ) and positions (ω) of the ν1(SiO4), ν2(SiO4), and ν3(SiO4) internal Raman bands, and the external rotation Raman band at ∼974, 438, 1008, and 356 cm−1 after each annealing step. We fitted a Johnson–Mehl–Avrami–Kolmogorov and a distributed activation energy model to the fractional annealing data, calculated from the widths of the ν2(SiO4), ν3(SiO4), and external rotation bands. From the kinetic models, we determined closure temperatures Tc for damage accumulation for each Raman band. Tc ranges from 330 to 370 ∘C for the internal ν2(SiO4) and ν3(SiO4) bands; the external rotation band is more sensitive to thermal annealing (Tc∼260 to 310 ∘C). Our estimates are in general agreement with previous ones, but more geological evidence is needed to validate the results. The Tc difference for the different Raman bands offers the prospect of a multi-closure-temperature zircon Raman thermochronometer.

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Section: Introductionmentioning

confidence: 99%

The closure temperature(s) of zircon Raman dating

et al. 2021

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“…The drop in He retention at high α-doses is corroborated by mapping He concentrations in zoned zircons showing high variation of eU across zones (Danišik et al, 2017). Recent studies on zircon (U-Th)/He dating (Anderson et al, 2020;Hueck et al, 2018) use Raman measurements for monitoring radiation damage for improving the interpretation of (U-Th)/He ages. Ginster (2018) reported that radiation-damage annealing also changes He diffusion parameters compared unannealed zircons.…”

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confidence: 83%

“…Measurements of self-irradiation damage are thus an important part of thermochronologic studies. Such measurements broke ground for: (a) zircon Raman dating, in which the self-irradiation damage itself is a measure of the age of the sample (Härtel, Jonckheere, Wauschkuhn, Hofmann, et al, 2021;Pidgeon, 2014); (b) the refinement of thermochronometers, whose results are influenced by self-irradiation damage, for example, (U-Th)/ He dating (Anderson et al, 2020;Guenthner et al, 2013); and (c) the applicability of provenance studies, using Raman characteristics of detrital zircons to distinguish thermal histories (Garver & Davidson, 2015;Resentini et al, 2020).Zircon (ZrSiO 4 ) substitutes U and Th for Zr in its structure. Disintegration of 238 U, 235 U, 232 Th, and their daughters damages the lattice by the emission of α-particles and the recoil of the daughter nuclei (Bohr, 1948;Joly, 1907;Mügge, 1922).…”

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confidence: 99%

Multi‐Band Raman Analysis of Radiation Damage in Zircon for Thermochronology: Partial Annealing and Mixed Signals

Härtel

Jonckheere

Ratschbacher

2022

Geochem Geophys Geosyst

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Thermochronology studies the timing and rates of geologic phenomena based on the radioactive processes occurring within natural minerals. At the same time, these processes damage the mineral, changing its properties over time. Measurements of self-irradiation damage are thus an important part of thermochronologic studies. Such measurements broke ground for: (a) zircon Raman dating, in which the self-irradiation damage itself is a measure of the age of the sample (Härtel, Jonckheere, Wauschkuhn, Hofmann, et al., 2021;Pidgeon, 2014); (b) the refinement of thermochronometers, whose results are influenced by self-irradiation damage, for example, (U-Th)/ He dating (Anderson et al., 2020;Guenthner et al., 2013); and (c) the applicability of provenance studies, using Raman characteristics of detrital zircons to distinguish thermal histories (Garver & Davidson, 2015;Resentini et al., 2020).Zircon (ZrSiO 4 ) substitutes U and Th for Zr in its structure. Disintegration of 238 U, 235 U, 232 Th, and their daughters damages the lattice by the emission of α-particles and the recoil of the daughter nuclei (Bohr, 1948;Joly, 1907;Mügge, 1922). An α-particle displaces ∼10 2 atoms toward the end of its ∼10-20 μm trajectory through the

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“…The Pb, Hf and O diffusion rates in crystalline zircon were shown to be sluggish under anhydrous conditions [16][17][18][19][20] , whereas O diffuses faster under hydrous conditions 16,21 . In addition, the resetting of U-Pb ages is also controlled by the degree of radiation damage of the zircon lattice 10,22 , which variably resets U-Pb ages when zircon recrystallization without uids 5,13,14 . In contrast, during dissolution-reprecipitation and recrystallization in the presence of metamorphic uids, both U-Pb ages and O isotope system in zircon would be partially or completely reset 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Retrograded Eclogite From Chicheng, North China Craton: New Insights Into the Fidelity of U-Pb-Hf-O Isotopes in Zircon During High-grade Metamorphism

Zou

Zhang

Santosh³

2021

Preprint

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Zircon is the most abundantly used mineral for dating igneous and metamorphic events and for tracing source characteristics. Understanding the geochemical behavior of the U-Pb-Hf-O isotope systems during high-grade metamorphism is therefore important for accurate interpretation of the isotopic information. We report zircon U-Pb-Hf-O isotopes and trace elements of retrograded eclogites and host gneisses from Chicheng, North China Craton, with the aim to obtain new insights into the fidelity of U-Pb-Hf-O isotopes in zircon as recorders of high-grade metamorphism. U-Pb dating suggested that the Chicheng mélange experienced eclogite facies metamorphism at ~1.84 Ga, and then exhumed to amphibolite facies at 320–300 Ma. Zircons with Paleoproterozoic ages formed in metamorphic melts-derived from the gneiss during the eclogite facies metamorphism. Zircons with ages of 300–320 Ma formed by recrystallization of peak metamorphic zircons during fluid-assisted amphibolite-facies retrograde metamorphism. This process led to the near-complete resetting not only of U-Pb ages but also of Hf-O isotopic compositions of the peak metamorphic zircons, while preserve REE patterns. These results contrast with the sluggish Hf diffusion rate predicted from experimental studies, and support findings that isotopic data from metamorphic zircons in retrograded high-grade metamorphic rocks need not be faithful recorders of their sources.

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Mapping radiation damage zoning in zircon using Raman spectroscopy: Implications for zircon chronology

Cited by 32 publications

References 65 publications

The closure temperature(s) of zircon Raman dating

The closure temperature(s) of zircon Raman dating

Multi‐Band Raman Analysis of Radiation Damage in Zircon for Thermochronology: Partial Annealing and Mixed Signals

Retrograded Eclogite From Chicheng, North China Craton: New Insights Into the Fidelity of U-Pb-Hf-O Isotopes in Zircon During High-grade Metamorphism

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