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Author Morano, Sandra ♦ Cordenons, Pablo ♦ Alves, Adriana ♦ Azzone, Rogério Guitarrari ♦ Sproesser, Walter ♦ Souza, Solange De ♦ Munoz, Patricio Montecinos
Source Directory of Open Access Journals (DOAJ)
Content type Text
Publisher Sociedade Brasileira de Geologia
File Format HTM / HTML
Date Created 2017-02-11
Language English ♦ French ♦ Portuguese ♦ Spanish
Subject Domain (in LCC) QE1-996.5
Subject Keyword Science ♦ Determinações isotópicas de Sr ♦ Geology ♦ Spectrometria de massa acoplada a ICP ♦ Ablação a laser ♦ Interferências isobáricas
Abstract ABSTRACT: This contribution describes the successful implementation of in situ Sr isotope analyses by LA-MC-ICP-MS at the CPGeo-USP. The choice for an analytical configuration using measurements of half-masses allows the accurate assessment of lanthanide interferences, permitting the determination of Sr isotopes in important REE-rich accessory phases, such as apatite. Likewise, the on-peak-zero method effectively corrects the background contribution (both from Kr and residual Sr contributions from previous ablations) to the signals of the unknown samples. The analytical campaigns resulted in an accuracy, in respect to reference TIMS values, better than 57 ppm (~ ±0.000057 2σ SD) for a modern coral and the Batjberg clinopyroxene which impart significant quality to our data. Similarly, the majority of the stable Sr isotope ratios are close to the accepted values, which also confirms the effectiveness of the method. The achieved accuracy allows the identification and investigation of spatially-controlled isotopic heterogeneities on the micrometric scale in several Sr-rich minerals (apatite, carbonates, plagioclase, and clinopyroxene) with important implications to the understanding of relevant geochemical processes, particularly AFC, source geochemical heterogeneities and magma-mixing.
ISSN 23174692
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
e-ISSN 23174889
Journal Brazilian Journal of Geology
Volume Number 46
Issue Number suppl 1
Page Count 17
Starting Page 227
Ending Page 243

Source: Directory of Open Access Journals (DOAJ)