High-precision Pb isotope analysis by multicollector-ICP-mass-spectrometry using 205Tl/203Tl normalization: Optimization and calibration of the method for the studies of Pb isotope variations

Чернышев, И. В.; Чугаев, А. В.; Шатагин, К. Н.

doi:10.1134/s0016702907110018

Cited by 104 publications

(25 citation statements)

References 11 publications

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“…Duplicated sample of BCR-2 also yielded consistent results with 87 Sr/ 86 Sr ratios of 0.705050 AE 0.000012(2σ), 143 Nd/ 144 Nd ratios of 0.512633 AE 0.000007(2σ), and 176 Hf/ 177 Hf ratios of 0.282852 AE 0.000005(2σ). Detailed analytical procedures for Sr, Nd, and Hf and Pb isotopic measurements are as described in Wei et al [2002], Li et al [2004], and Chernyshev et al [2007], respectively.…”

Section: Methodsmentioning

confidence: 99%

Isotopically enriched N‐MORB: A new geochemical signature of off‐axis plume‐ridge interaction—A case study at 50°28′E, Southwest Indian Ridge

et al. 2017

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Interaction between the Southwest Indian Ridge (46°E and 52°20′E) and Crozet hotspot has been proposed by geophysical studies but remains controversial mostly due to the lack of E‐MORB (enriched mid‐ocean ridge basalts). Forty‐seven new samples collected from this region, including 15 from segment 27 centered at 50°28′E with a 10 km thick crust, are all N‐MORB (normal MORB) and can be classified into two groups: a high‐Al group only at 50°28′E and a Main group widespread. The former, with higher Al2O3 and lower TiO2 and SiO2, have slightly enriched Sr‐Nd‐Hf‐Pb isotopic compositions. We propose that their major and trace elemental signatures were modified by reaction with primitive cumulate in the crust, whereas the enriched isotopic compositions indicate the contribution of Crozet plume materials. During upslope flow of the Crozet plume to the ridge, decompression melting would occur along the path, which would deplete the plume in incompatible elements but not significantly change the isotopic compositions. Thus, when they finally reach the ridge, the depleted residue would remelt due to further decompression at MOR and produce isotopically enriched N‐MORB at segment 27. Isotopically enriched N‐MORB are known elsewhere, mostly at slower‐spreading ridges possibly influenced by plumes with large plume‐ridge distances. In particular, the constant Nd isotopic compositions with decreasing (La/Sm)N ratios for off‐axis magmatism between the Réunion hotspot toward the CIR perfectly match such a plume‐ridge interaction model. Therefore, aside from E‐MORB, isotopically enriched N‐MORB can also be considered as the geochemical signature for off‐axis plume‐ridge interaction.

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Section: Methodsmentioning

confidence: 99%

Isotopically enriched N‐MORB: A new geochemical signature of off‐axis plume‐ridge interaction—A case study at 50°28′E, Southwest Indian Ridge

et al. 2017

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“…One strategy is to aspirate a Tl tracer solution during laser analysis to monitor Pb fractionation. 26,27 Another strategy is to use standard materials to make external corrections.…”

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confidence: 99%

Lead isotope analysis of melt inclusions by LA-MC-ICP-MS

Zhang

Ren

Nichols

et al. 2014

J. Anal. At. Spectrom.

102

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Pb isotope compositions of melt inclusions provide unique information about the composition of primary magmas and their source. In this study, we have developed a method for measuring Pb isotopes in small olivine-hosted melt inclusions (>40 mm) from young and old volcanoes by LA-MC-ICP-MS. We used a new interface cone assemblage consisting of a Jet sample cone and X skimmer cone. A small flow of N 2 gas was added to the carrier gas and passed through the assemblage to enhance the signal intensity. In addition the energy and repetition rate of the laser conditions were reduced and the signal integration time was shortened in order to lengthen the laser ablation time and to collect enough data. Mass bias and instrument drift were corrected using a standard-sample-standard bracketing method. The analysis routine employed eight ion counters to receive 238 basalts, but also from old samples that require correction for U-Th decay.

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“…Lead isotope ratios were measured on the MC-ICP-MS and the mass fractionation internally corrected after the addition of thallium isotopic reference material NBS-997. The detailed protocols are similar to those described by Chernyshev et al (2007). The accuracy of the results was confirmed by repeated analyses of lead isotopic reference material NBS-981.…”

Section: Lead Isotope Analysismentioning

confidence: 77%

The first metallurgy in the Pityusic Islands (Balearic archipelago, Mediterranean Sea)

Sureda

2018

Archaeol Anthropol Sci

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The islands of Ibiza and Formentera (the Pityusic Islands in the Balearic archipelago, Spain) were one of the last insular contexts to be colonised in the Mediterranean. The first settlement occurred during the second millennium cal BCE, probably by continental Bronze Age communities. During the first centuries of occupation (ca. 2100-1400 cal BCE), local material culture is defined in terms of the Bell-Beaker/Dolmenic and First Naviform periods. The Pityusic Islands have no mineral resources for producing copper or bronze objects locally, so the presence of metal objects dated to these periods necessarily indicates exogenous contact. Seven metal objects have been found in five archaeological sites located in both islands. Archaeometallurgical research conducted on these objects reveals the economic behaviour of these first settlers in acquiring these resources. In this respect, aspects of this behaviour, such as technological patterns and trade dynamics, are analysed.

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High-precision Pb isotope analysis by multicollector-ICP-mass-spectrometry using 205Tl/203Tl normalization: Optimization and calibration of the method for the studies of Pb isotope variations

Cited by 104 publications

References 11 publications

Isotopically enriched N‐MORB: A new geochemical signature of off‐axis plume‐ridge interaction—A case study at 50°28′E, Southwest Indian Ridge

Isotopically enriched N‐MORB: A new geochemical signature of off‐axis plume‐ridge interaction—A case study at 50°28′E, Southwest Indian Ridge

Lead isotope analysis of melt inclusions by LA-MC-ICP-MS

The first metallurgy in the Pityusic Islands (Balearic archipelago, Mediterranean Sea)

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