Radiation damage and alteration of zircon from a 3.3 Ga porphyritic granite from the Jack Hills, Western Australia

Utsunomiya, Satoshi; Valley, John W.; Cavosie, Aaron J.; Wilde, Simon A.; Ewing, Rodney C.

doi:10.1016/j.chemgeo.2006.09.003

Cited by 55 publications

(27 citation statements)

References 68 publications

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“…Ca and P contents correlate with dose, ranging up to *4,000 and 25,000 ppm, respectively, in the most altered domains. A number of studies have shown that an increase in [Ca] in zircons is correlated with higher a-decay doses, suggesting late hydration of the radiation-damaged (higher [U] and [Th]) areas (Aines and Rossman 1986;Geisler et al 2003b;Geisler and Schleicher 2000b;Rayner et al 2005;Utsunomiya et al 2007;Woodhead et al 1991). The effects of radiation damage on [Li] and d 7 Li are not known.…”

Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 96%

“…Radiation damage increases the susceptibility of zircon to elemental exchange and alteration (e.g., Geisler and Schleicher 2000a;Silver and Deutsch 1963;Utsunomiya et al 2007). Geisler et al (2003a) demonstrated that alteration can lower the Zr, Si, Hf, REE, U, Th, Th/U, and radiogenic Pb contents of zircons and increase the concentration of other cations (Ca 2?…”

Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 99%

“…). Utsunomiya et al (2007) studied radiation-damaged zircons from a 3.3-Ga granite adjacent to the Jack Hills metasedimentary belt in order to examine the effects of radiation damage as a function of dose. In spite of very high doses within localized domains (0.21-1.0 9 10 17 a-decay events/mg), damage is partially annealed and none of the zircons are fully amorphous.…”

Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 99%

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Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Bouvier

Ushikubo

Kita

et al. 2011

Contrib Mineral Petrol

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We report d 7 Li, Li abundance ([Li]), and other trace elements measured by ion probe in igneous zircons from TTG (tonalite, trondhjemite, and granodiorite) and sanukitoid plutons from the Superior Province (Canada) in order to characterize Li in zircons from typical Archean continental crust. These data are compared with detrital zircons from the Jack Hills (Western Australia) with U-Pb ages greater than 3.9 Ga for which parent rock type is not known. Most of the TTG and sanukitoid zircon domains preserve typical igneous REE patterns and CL zoning.[Li] ranges from 0.5 to 79 ppm, typical of [Li] in continental zircons. Atomic ratios of (Y ? REE)/(Li ? P) average 1.0 ± 0.7 (2SD) for zircons with magmatic composition preserved, supporting the hypothesis that Li is interstitial and charge compensates substitution of trivalent cations. This substitution results in a relatively slow rate of Li diffusion. The d 7 Li and trace element data constrain the genesis of TTGs and sanukitoids. [Li] in zircons from granitoids is significantly higher than from zircons in primitive magmas in oceanic crust. TTG zircons have d 7 Li (3 ± 8%) and d 18 O in the range of primitive mantlederived magmas. Sanukitoid zircons have average d 7 Li (7 ± 8%) and d 18 O higher than those of TTGs supporting genesis by melting of fluid-metasomatized mantle wedge. The Li systematics in sanukitoid and TTG zircons indicate that high [Li] in pre-3.9-Ga Jack Hills detrital zircons is a primary igneous composition and suggests the growth in proto-continental crust in magmas similar to Archean granitoids.

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Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 96%

Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 99%

Section: Effects Of Radiation Damage On Trace Element Compositionsmentioning

confidence: 99%

See 1 more Smart Citation

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Bouvier

Ushikubo

Kita

et al. 2011

Contrib Mineral Petrol

Self Cite

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“…With such high concentrations of radioactive elements, the zircons are prone to structural damage, metamictization and consequently disturbance of the U-Pb isotopic system. Utsunomiya et al (2007) have shown that heavily metamictized high U and Th zones in zircons also have higher concentrations of trace element impurities (e.g. Ca, Al) and secondary alteration nano-phases.…”

Section: Discussionmentioning

confidence: 99%

Chemical abrasion applied to SHRIMP zircon geochronology: An example from the Variscan Karkonosze Granite (Sudetes, SW Poland)

et al. 2012

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Thermal annealing followed by acid etching of zircon (chemical abrasion or CA) can be successfully utilised to minimize or eliminate the effects of major and cryptic Pb-loss for SIMS UPb zircon dating. The procedure is demonstrated by applying the U-Pb SIMS technique to both untreated and chemically abraded zircons from the Karkonosze Granite, Sudetes, SW Poland.Conventional U-Pb SIMS dating of untreated zircons yields an apparently coherent age population (n=9) For the analysed sample, U-Pb ages determined from chemically abraded zircons are c. 5 % older than those from untreated zircons. This is attributed to effective removal of metamict domains susceptible to Pb-loss. The CA technique also removes micro-inclusions thus lowering common Pb and reducing matrix effects. A cryptic Pb-loss in untreated zircons is only recognised when compared with chemically abraded counterparts or ages determined using other isotope techniques.This clearly demonstrates the utility of CA to high-spatial resolution methods and stresses that Pbloss is detectable at a range of scales, regardless of the analytical technique used.

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“…In addition to cathodoluminescence (CL) and backscattered electron (BSE) imaging, recent studies have shown that the trace element compositions of zircon are *Corresponding author (email: yshliu@vip.sina.com or yshliu@hotmail.com) helpful in interpreting the geological significance of U-Pb ages [4−13]. For example, because the diffusion rates of rare earth elements (REE) in zircon are slower than Pb by at least one order of magnitude, REE in zircon is hardly affected by solid-state recrystallization during metamorphism unless this occurs at very high temperatures [1−3] or the zircon developed a radiation-damaged structure [14,15]. Thus zircon REE compositions can provide information about the chemical/physical environments of zircon formation [16].…”

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confidence: 99%

Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS

et al. 2010

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A protocol was established for simultaneous measurements of zircon U-Pb ages and trace elements by LA-ICP-MS at spot sizes of 16−32 μm. This was accomplished by introducing N 2 into ICP to increase the sensitivity. The obtained U-Pb ages for zircon standards GJ-1, TEMORA and SK10-2 are consistent with the preferred values within about 1% uncertainty (2σ) by simple external calibration against zircon standard 91500. Different data reduction softwares could yield different uncertainties for calculation of U-Pb ages. The commercially available program GLITTER4.4 could apply an improper uncertainty calculation strategy, but it may yield artificial high precisions for single analyses. Our trace element analyses indicate that Si is not an ideal internal standard for zircon when calibrated against the NIST glasses. Calibration against the NIST glasses using Si as an internal standard, a systematic deviation of 10%−30% was found for most trace elements including Zr. However, the trace element compositions of zircon can be accurately measured by calibration against multiple reference materials with natural compositions (e.g., BCR-2G, BHVO-2G and BIR-1G), or calibration against NIST SRM 610 and using Zr as an internal standard. Analyses of two pieces of GJ-1 demonstrate that it is relatively homogenous for most trace elements (except for Ti). Zircon, U-Pb age, trace element, uncertainty, LA-ICP-MS Citation: Liu Y S, Hu Z C, Zong K Q, et al. Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS.

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Radiation damage and alteration of zircon from a 3.3 Ga porphyritic granite from the Jack Hills, Western Australia

Cited by 55 publications

References 68 publications

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Chemical abrasion applied to SHRIMP zircon geochronology: An example from the Variscan Karkonosze Granite (Sudetes, SW Poland)

Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS

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