LA-MC-ICP

Zircon grain LA-MC-ICP-MS (Neptune) NewWave 2D , 206 0.22 geology Bouman et al.152... [Pg.236]

Further applications of LA-MC-ICP-MS using the Plasma 54 by Zr isotope ratio measurements in zircon and baddeleyite samples are described by Hirata.147 The isotope ratios 92Zr/90Zr = 0.333 94 0.000 02 and 96Zr/90Zr = 0.054 63 0.000 01 have been determined on a Merck reagent with a precision of 0.01-0.02% and 0.03-0.04%, respectively. Neither isotopic variation in the... [Pg.238]

W reagent standard solutions, metallic W ribbon W Laser ablation [DA] Measure with multicollector MC-ICP-MSr and UV Laser Microprobe system w Nd YAG laser 266 nm [TRA-LA-MC-ICP-MS] [DA-TRA-LA- MC-ICP-MS] Hirata (2002)... [Pg.1601]

Hirata T (2002) In-situ precise isotopic analysis of tungsten using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) with time resolved data acquisition. J Anal Atom Spectrom 17 204-210. [Pg.1622]

LA-MC-ICP-MS Laser ablation multicollector inductively coupled plasma mass spectrometry... [Pg.1687]

Lloyd, N.S., et al. (2009) Precise and accurate isotopic analysis of microscopic uranium-oxide grains using LA-MC-ICP-MS. Journal of Analytical Atomic Spectrometry, 24,752-758. [Pg.471]

The protocol applied to collect raw data and calculate the associated mean age using LA-MC-ICP-MS and an MIC system will be developed below. Before using the laser system for geochronological purposes, the sensitivity and the precision that can be achieved using such MC-ICP-MS (MIC) instrument was evaluated for determining Pb/Pb ratios on natural water [9]. [Pg.675]

These measurements on solutions will fix the best precision that cannot at present be exceeded using a laser for sample introduction in the MC-ICP-MS. After preliminary remarks about the U-Pb system in a zircon mineral phase, the first section describes the method to achieve convenient preparation of the samples. In the second section, the laser conditions to achieve isotope measurements on zircon are listed, and some reference zircon samples, already dated by using other techniques, are dated to check the precision and accuracy of the LA-MC-ICP-MS protocol. Finally, an example of an investigation of very young zircons, which are the most difficult samples because they contain very little amounts of radiogenic Pb, is discussed. [Pg.676]

FIGURE 31.2 Backscattered electron image of a zircon grain showing botryoidal alteration (dark area) and fractures. The lighter domains are suitable for LA-MC-ICP-MS (scale bar 100 um). [Pg.677]

LA-MC-ICP-MS APPLIED TO U-PB ZIRCON GEOCHRONOLOGY TABLE 31.3 ICP-MS Instrumentation and Operational Settings ... [Pg.686]

The critical point of this method, applied after LA-MC-ICP-MS measurements, is to achieve the best estimate of from the sample (if any) despite the significant amount of... [Pg.690]

L53 LA-MC-ICP-MS Results Compared with SHRIMP and TIMS... [Pg.690]

FIGURE 31.12 U-Pb age determination on zircon from Cinque Frati granite (Corsica, France). (A) Common-Pb uncorrected Tera and Wasserburg diagram for data obtained with LA-MC-ICP-MS (290.7 2.4 Ma [2o] MSWD = 2.7 [n = 20]). (B) Conventional Concordia diagram data corrected for common-Pb using Pb (ID-TIMS) (286.4 + 1.7 Ma [2oj MSWD = 1.2 [n = 7]). [Pg.691]

TABLE 31.4 LA-MC-ICP-MS Zircon Data for Cinque Frati Sample Using "Pb Method for Common-Pb Correction... [Pg.692]

To summarize, the common procedure, including 16-20 spot analyses on zircon grains from reference rocks of known origin and age, has demonstrated the abUity of LA-MC-ICP-MS to determine reliable ages of these zircon populations. Furthermore, the selected... [Pg.696]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...