Evaluation of a202Pb-205Pb Double Spike for High - Precision Lead Isotope Analysis.*

Todt, W.; Cliff, R. A.; Hanser, Α.; Hofmann, Albrecht W.

doi:10.1029/gm095p0429

Cited by 323 publications

(147 citation statements)

References 12 publications

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“…The element chromatography followed ARTICLE established standard procedures 53 . Isotopic ratios were analysed in static multicollection mode on a TRITON (Nd) and MAT262 RPQ 54 . Total chemistry were o100 ng Sr-Nd-Pb and thus considered neglible relative to the amount of sample.…”

Section: Resultsmentioning

confidence: 99%

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

et al. 2014

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Large igneous province subduction is a rare process on Earth. A modern example is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of B32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together with increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi Plateau-Kermadec arc collision B250 km north of its present position. The combined data set indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java Nui piece) than previously believed has already been subducted. Oblique plate convergence caused southward migration of the thickened and buoyant oceanic plateau crust, creating a buoyant 'Hikurangi' mélange beneath the Moho that interacts with ascending arc melts.

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Section: Resultsmentioning

confidence: 99%

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

et al. 2014

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“…Pb isotope ratios were corrected for instrumental fractionation by a factor of 0.1% per amu based on more than 100 measurements of the SRM981 standard and using the standard values of Todt et al (1996). Procedural blanks were <200 pg.…”

Section: Sediment Digestion Procedure Element Separation and Isotopementioning

confidence: 99%

Radiogenic isotopes for deciphering terrigenous input provenance in the western Mediterranean

et al. 2015

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“…As shown in the result section, a precision better than 100 ppm for all three ratios is attainable when averaging individual analyses. To be directly comparable with previously published data on lavas (Vlastélic et al, 2009a), the data already corrected for mass bias and instrumental drift were renormalized to the NBS981 values of Todt et al (1996). Total Pb procedural blanks (HNO 3 dissolution) were measured using the 206 Pb-enriched NBS983 spike and range between 7 and 13 pg (n = 3).…”

Section: Pb Purification and Pb Isotope Analysismentioning

confidence: 99%

“…It is possible that less fractionation occurs when using the specific Sr-spec resin (Smet et al, 2010) or in the case of batch chemistry. Addition of a 202 Pb-205 Pb spike (Todt et al, 1996) at the dissolution step could be a simple way to correct for both chemical and instrumental Pb isotope fractionation.…”

Section: Pb Isotope Measurements: Error Arising From Chemical Separationmentioning

confidence: 99%

Lead isotopes behavior in the fumarolic environment of the Piton de la Fournaise volcano (Réunion Island)

Vlastelić

Staudacher

Deniel

et al. 2013

Geochimica et Cosmochimica Acta

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The recent activity of the Piton de la Fournaise volcano offers a rare opportunity to address the issue of Pb isotope behavior in volcanic fumaroles, as the composition of the degassing source is accurately and precisely known. Gas sublimates formed between 2007 and 2011 at temperature ranging from 400 to ca. 100°C include Na-K sulfate (aphthitalite), Ca-Cu sulfate (e.g., gypsum), Na sulfate (thenardite), Ca-Mg-Al-Fe fluoride (e.g., ralstonite) and native sulfur. The high-temperature deposits show trace element patterns typical of volcanic gas (with Pb concentration up to 836 ppm) while the lowtemperature deposits are depleted in most volatile elements (Pb <1 ppm) with the exception of Pd and Tl (in fluorides) and Se (in native sulfur).Only for low-temperature fluoride samples do Pb isotope compositions plot significantly outside the field of lavas. The isotopic shift is ascribed to leaching ubiquitous unradiogenic phases (e.g., sulfides) by acidic gas condensates. The similarity in Pb isotope signature between lavas and sublimate samples more representative of the gas phase (sulfates) indicates that the net fractionation of Pb isotopes resulting from volatilization and condensation processes is smaller than the precision of Pb isotope measurements (better than 60 ppm/a.m.u.). The absence of net fractionation could result from negligible isotope fractionation during Pb volatilization followed by extensive condensation of gaseous Pb, with possibly significant isotopic fractionation at this stage. Although this scenario has to be refined by more direct measurement of the gas phase, and its general applicability tested, it suggests that a small fraction (<10%) of initially volatilized Pb ultimately escapes to the atmosphere, while the remaining dominant fraction is trapped in sublimates. As sublimates are rapidly dissolved and entrained by runoff, the fumarolic environment appears as a factory efficiently transferring isotopically unfractionated Pb from magmas towards the hydrological system and seawater.Resolving very small isotopic differences between magmas and their gaseous products remains an analytical challenge. High-precision Pb isotope measurements rest not only on instrumental performance but also on high-yield chemistry, as Pb isotopes drastically fractionate (800 ppm/a.m.u.) upon elution on anionic resin. For 50% Pb recovery, the estimated isotopic bias is plus or minus 60-80 ppm/a.m.u., depending on which of the early (isotopically light) or late (isotopically heavy) Pb fraction is lost.

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Evaluation of a²⁰²Pb-²⁰⁵Pb Double Spike for High - Precision Lead Isotope Analysis.^*

Cited by 323 publications

References 12 publications

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

Radiogenic isotopes for deciphering terrigenous input provenance in the western Mediterranean

Lead isotopes behavior in the fumarolic environment of the Piton de la Fournaise volcano (Réunion Island)

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