Influence of radiation damage on Late Jurassic zircon from southern China: Evidence from in situ measurements of oxygen isotopes, laser Raman, U–Pb ages, and trace elements

Wang, Xiao Lei; Coble, Matthew A.; Valley, John W.; Shu, Xu-Jie; Kitajima, Kouki; Sun, Tao

doi:10.1016/j.chemgeo.2014.09.013

Cited by 109 publications

(51 citation statements)

References 73 publications

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“…Thus, in addition to calculating the total dose, it is desirable to estimate the amount of actual damage in a domain of interest. For zircons below the first percolation point, the amount of preserved radiation damage has been estimated from broadening and shifting toward lower wavenumber of Raman bands as measured in reflectance mode at 1 μm-scale Nasdala et al 2001bNasdala et al , 2003Pidgeon et al 2013;Gao et al 2014;Wang et al 2014).…”

Section: Radiation Damage In Zirconmentioning

confidence: 99%

“…Likewise, SIMS analysis can identify pristine domains that yield concordant ages and low concentrations of non-formula elements such as Ca, Fe, and Al (Krogh and Davis 1975;Geisler and Schleicher 2000;Rayner et al 2005;Cavosie et al 2006;Geisler et al 2007;Bouvier et al 2012), and multiple analyses for different isotope systems can be correlated to zoning patterns (Cavosie et al 2006). One promising new approach is to monitor the molecular ion, 16 O 1 H, during SIMS analysis of 18 O/ 16 O as a guide to water content, which may correlate to radiation damage (Pidgeon et al 2013;Wang et al 2014). It is always good to look at zircons carefully by a range of techniques before analysis, however, the above procedures provide only an indirect measurement of properties that may correlate to alteration.…”

Section: Introductionmentioning

confidence: 98%

“…The increasing use of in situ techniques for spot analysis of sub-domains of a zircon reinforces the importance of evaluating the localized effects of radiation damage, which can facilitate elemental and isotopic exchange and cause erroneous results for measurements of U-Pb age White and Ireland 2012); oxygen isotope ratios (Valley et al 1994;Valley 2003;Cavosie et al 2005;Booth et al 2005; Gao et al 2014; Wang et al 2014), and trace elements Commonly achieved spatial resolution and detection range for microanalysis. APM = atom probe microscopy; APT = atom probe tomography; EDS = energy-dispersive X-ray spectrometry; EELS = electron energy loss spectroscopy; EPMA = electron-probe microanalysis; SEM = scanning electron microscopy; SIMS = secondary ion mass spectrometry; (S)TEM = (scanning) transmission electron microscopy; WDS = wavelength-dispersive X-ray spectrometry.…”

Section: Introductionmentioning

confidence: 98%

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Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

Valley

Reinhard

Cavosie

et al. 2015

American Mineralogist

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116

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Atom-probe tomography (APT) and secondary ion mass spectrometry (SIMS) provide complementary in situ element and isotope data in minerals such as zircon. SIMS measures isotope ratios and trace elements from 1-20 μm spots with excellent accuracy and precision. APT identifies mass/ charge and three-dimensional position of individual atoms (±0.3 nm) in 100 nm-scale samples, volumes up to one million times smaller than SIMS. APT data provide unique information for understanding element and isotope distribution; crystallization and thermal history; and mechanisms of mineral reaction and exchange. This atomistic view enables evaluation of the fidelity of geochemical data for zircon because it provides new understanding of radiation damage, and can test for intracrystalline element mobility. Nano-geochronology is one application of APT in which Pb isotope ratios from sub-micrometer domains of zircon provide model ages of crystallization and identify later magmatic and metamorphic reheating.Based on SEM imaging and SIMS analysis, 11 needle-shaped specimens ~100 nm in diameter were sampled from one Archean and two Hadean zircons by focused ion-beam milling and analyzed with APT. The three-dimensional distribution of Pb and nominally incompatible elements (Y, REEs) differs at the atomic scale in each zircon. Zircon JH4.0 (4.007 Ga, Jack Hills, Western Australia) is homogeneous in Pb, Y, and REEs. In contrast, Pb and Y and REEs are clustered in sub-equant ~10 nm diameter domains, spaced 10-40 nm apart in zircons ARG2.5 (2.542 Ga, Grouse Creek Mountains, Utah) and JH4.4 (4.374 Ga, Jack Hills). Most clusters are flattened parallel to (100) or (010). U and Th are not collocated with Pb in clusters and appear to be homogeneously distributed in all three zircons. The analyzed domains experienced 4 to 8 × 10 15 α-decay events/mg due to U and Th decay and yet all zircons yield U-Pb ages by SIMS that are better than 97% concordant, consistent with annealing of most radiation damage. The 207 Pb/ 206 Pb ratios for the 100 nm-scale specimens measured by APT average 0.17 for ARG2.5, 0.42 for the JH4.0, and 0.52 for JH4.4. These ratios are less precise (±10-18% 2σ) due to the ultra-small sample size, but in excellent agreement with values measured by SIMS (0.1684, 0.4269, and 0.5472, respectively) and the crystallization ages of the zircons. Thus Pb in these clusters is radiogenic, but unsupported, meaning that the Pb is not spatially associated with its parent isotopes of U and Th. For the domain outside of clusters in JH4.4, the 207 Pb/ 206 Pb ratio is 0.3, consistent with the SIMS value of 0.2867 for the zircon overgrowth rim and an age of 3.4 Ga. In ARG2.5, all Pb is concentrated in clusters and there is no detectable Pb remaining outside of the clusters. The Pb-Y-REE-rich clusters and lack of correlation with U in ARG2.5 and JH4.4 are best explained by diffusion of Pb and other elements into ~10 nm amorphous domains formed by α-recoil. Diffusion distances of ~20 nm for these elements in crystalline zircon are consistent with heatin...

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Section: Radiation Damage In Zirconmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

Valley

Reinhard

Cavosie

et al. 2015

American Mineralogist

Self Cite

116

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“…with the methods detailed in Williams (1998) and Wang et al (2014). Isoplot (Ludwig, 2008) and SQUID 2 (Ludwig, 2005) programs were used for reduction and plotting of U-Pb data.…”

Section: Figure 4 Geologic Map Of El Gordo Diapir Indicating Locatimentioning

confidence: 99%

U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

Lawton

Amato

2017

Lithosphere

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Ar cooling ages from a nearby diapir, which are younger than Upper Jurassic strata overlying the salt, combine to suggest that these samples were intruded into salt and exhumed during diapirism. A porphyritic mafic rock with a U-Pb zircon age of 150 Ma (Tithonian) has a crystallization age coeval with marine strata overlying the salt. It is interpreted as a shallow intrusion into salt emplaced after the onset of salt diapirism. Magmatism thus took place from 158 to 150 Ma.

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“…2 and in Appendix C. All of the PDL zircons have a relatively narrow range of δ 18 O zircon values (~5.8‰-6.9‰, n = 159) and enriched relative to zircons in equilibrium with mantle-derived melts (5.3 ± 0.6‰, 2σ; Valley et al, 1998;Cavosie et al, 2009 Cavosie et al, 2006), as these analyses have most likely been affected by secondary alteration (Hoskin, 2005;Wang et al, 2014a;Zeh et al, 2014), or sampled very small LREE-rich mineral or melt inclusions (Claiborne et al, 2010), or are hydrothermal zircons (Hoskin, 2005;Rayner et al, 2005). Analyses with low La concentrations (b0.1 ppm; Appendix E) and low La N /Yb N ratios (b0.003; Appendix D), all of which are indicative of significant heavy REE (HREE) enrichments (Fig.…”

Section: Zircon Oxygen Isotopesmentioning

confidence: 99%

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

Kong

Chen

2016

Chemical Geology

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Influence of radiation damage on Late Jurassic zircon from southern China: Evidence from in situ measurements of oxygen isotopes, laser Raman, U–Pb ages, and trace elements

Cited by 109 publications

References 73 publications

Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

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