Oxygen isotopic signature of 4.4–3.9Ga zircons as a monitor of differentiation processes on the Moon

Nemchin, A. A.; Whitehouse, Martin J.; Pidgeon, R. T.; Meyer, C.

doi:10.1016/j.gca.2005.12.009

Cited by 50 publications

(17 citation statements)

References 23 publications

(33 reference statements)

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“…A compilation of age‐indexed pre‐4.0 Ga zircon oxygen data (Table 2) with our new results is presented in Figure 4 [ Mojzsis et al , 2001; Peck et al , 2001; Cavosie et al , 2005; Valley et al , 2005; Nemchin et al , 2006b] along with lunar data for comparison [ Nemchin et al , 2006a]. The compilation includes only those zircon data accepted by various workers on the basis of separately established criteria regarding what constitutes “primary” oxygen isotope values.…”

Section: Discussionmentioning

confidence: 99%

“…The HfO 2 abundance in our primary zircon standard (AS‐3) is similar to JH and MN zircon compositions [ Cavosie et al , 2005; Maas et al , 1992; Crowley et al , 2005]. Nemchin et al [2006b] applied Hf‐related matrix effects corrections which were originally derived for high‐energy‐offset analyses [ Peck et al , 2001], in contrast to their low‐energy‐offsets. In the absence of observable matrix effects on our zircon standards, we applied no additional matrix effects corrections to the data.…”

Section: Samples and Methodsmentioning

confidence: 99%

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Constraints on Hadean zircon protoliths from oxygen isotopes, Ti‐thermometry, and rare earth elements

Trail¹,

Mojzsis

Harrison³

et al. 2007

Geochem Geophys Geosyst

176

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[1] We report zircon oxygen isotope ratios and reconnaissance Ti-in-zircon concentrations, guided by cathodoluminescence image studies, for detrital zircons up to 4.34 Ga from the Narryer Gneiss Complex of Western Australia. Zircon oxygen isotope results bolster the view that some Hadean (>3.85 Ga) zircon source melts were enriched in heavy oxygen, a sensitive proxy for melt contamination by sediments altered in liquid water. Zircon crystallization temperatures calculated from Ti concentration in pre-3.8 Ga zircons yield values around 680°C in all cases except for one lower value in a 4.0 Ga grain. Elevated zircon d 18O values reported here and elsewhere, combined with low minimum-melt crystallization temperatures, and analysis of zircon/melt partitioning of rare earth elements (REEs) provide mutually consistent lines of evidence that the Hadean Earth supported an evolved rock cycle which included formation of granitic water-saturated melts, extensive continental crust, hydrosphere-lithosphere interactions, and sediment recycling within the first 150 million years of planet formation.

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Section: Discussionmentioning

confidence: 99%

Section: Samples and Methodsmentioning

confidence: 99%

Constraints on Hadean zircon protoliths from oxygen isotopes, Ti‐thermometry, and rare earth elements

Trail¹,

Mojzsis

Harrison³

et al. 2007

Geochem Geophys Geosyst

176

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show abstract

“…The runs comprised a 90 second pre-sputter period with a raster of 20 μm, and field aperture centering using the 16 O signal followed by 64 seconds of data acquisition using two Faraday detectors in the multicollector system operating a common mass resolution of ca. 2500. Corrections for instrumental mass fractionation were determined using international reference material NBS-28 (silica sand), with further details given in refs 60 and 61. Full descriptions of all methods employed, including for Sr-, Nd-, and He-isotope analyses, are provided in the Supplementary Information.…”

Section: Methods Summarymentioning

confidence: 99%

Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz

Budd

Troll

Deegan

et al. 2017

Sci Rep

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Quartz is a common phase in high-silica igneous rocks and is resistant to post-eruptive alteration, thus offering a reliable record of magmatic processes in silicic magma systems. Here we employ the 75 ka Toba super-eruption as a case study to show that quartz can resolve late-stage temporal changes in magmatic δ18O values. Overall, Toba quartz crystals exhibit comparatively high δ18O values, up to 10.2‰, due to magma residence within, and assimilation of, local granite basement. However, some 40% of the analysed quartz crystals display a decrease in δ18O values in outermost growth zones compared to their cores, with values as low as 6.7‰ (maximum ∆core−rim = 1.8‰). These lower values are consistent with the limited zircon record available for Toba, and the crystallisation history of Toba quartz traces an influx of a low-δ18O component into the magma reservoir just prior to eruption. Here we argue that this late-stage low-δ18O component is derived from hydrothermally-altered roof material. Our study demonstrates that quartz isotope stratigraphy can resolve magmatic events that may remain undetected by whole-rock or zircon isotope studies, and that assimilation of altered roof material may represent a viable eruption trigger in large Toba-style magmatic systems.

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“…The accessory mineral zircon found within these rocks can be dated using the U-Pb system and provides a temporal record of geochemical information (e.g., Hanchar and Hoskin 2003). Oxygen isotopes in zircon have been used to chronicle the maturation of Earth's crust throughout geologic time , elucidate the origins of granite (Kemp et al 2007), monitor differentiation of lunar crust (Nemchin et al 2006b), and demonstrate the presence of liquid water on the surface of Earth in the earliest Archean (Wilde et al 2001;Mojzsis et al 2001;Cavosie et al 2005). Although the concordance of U-Pb geochronology provides robust tests to evaluate post crystallization alteration, the oxygen isotope system contains no such safeguards and its resistance to chemical and physical alteration must be evaluated by other means.…”

Section: Introductionmentioning

confidence: 99%

High-precision oxygen isotope analysis of picogram samples reveals 2 m gradients and slow diffusion in zircon

Page

Ushikubo

Kita

et al. 2007

American Mineralogist

114

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Ion microprobe analysis with a sub-micrometer diameter spot reveals a sharp, 2 μm gradient in oxygen isotope ratio proving that oxygen diffusion in zircon is slow even under prolonged high-grade metamorphism. The data are consistent with an oxygen diffusion coeffi cient of 10 -23.5±1 cm 2 /s. Furthermore, this gradient is found in a zircon that contains clear textural evidence of recrystallization in nearby regions. This fi nding shows that through careful textural and chemical analysis, primary information can be extracted from a zircon that has also undergone partial recrystallization. The oxygen isotope ratios found in zircon have been used to infer magmatic and pre-magmatic histories, including the presence of liquid water on the surface of earliest Earth. Recently, these interpretations have been questioned with the assertion that zircon may not retain its primary oxygen isotope signature through metamorphism. The slow diffusion confi rmed by these results supports interpretations that assume preservation of magmatic compositions.

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Oxygen isotopic signature of 4.4–3.9Ga zircons as a monitor of differentiation processes on the Moon

Cited by 50 publications

References 23 publications

Constraints on Hadean zircon protoliths from oxygen isotopes, Ti‐thermometry, and rare earth elements

Constraints on Hadean zircon protoliths from oxygen isotopes, Ti‐thermometry, and rare earth elements

Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz

High-precision oxygen isotope analysis of picogram samples reveals 2 m gradients and slow diffusion in zircon

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