Publication Date:
2022-06-01
Description:
Allanite is a common accessory mineral that generally incorporates considerable amounts of Th, U and light rare Earth elements in its structure, making it a useful mineral for in situ U-Th-Pb geochronology and Sm-Nd isotope measurements. Here, we present in situ U-Th-Pb ages and Sm-Nd isotopic compositions for nine allanite samples considered as potential reference materials (CAPb, Tara, Daibosatsu, LE40010, LE2808, A007, A011, A012 and SQ-51), with ages ranging from ~ 2650 Ma to ~ 12 Ma. Our study indicates that Daibosatsu and LE40010 have relatively homogeneous 147Sm/144Nd and 143Nd/144Nd isotopic compositions (147Sm/144Nd ratio variation is less than 2%) and, thus, can serve as primary reference materials for Sm-Nd microanalysis. In contrast, CAPb, Tara, LE2808, A007, A011 and A012 all show homogeneous calculated initial 143Nd/144Nd isotopic compositions, but with variable 147Sm/144Nd compositions, and thus can be used only as secondary reference materials for Sm-Nd microanalysis. Of these materials, LE40010 allanite can serve as a suitable primary reference material for in situ U-Pb dating, CAPb allanite can serve as a suitable primary reference material for in situ Th-Pb dating, and LE2808, LE40010, A007, A011 and A012 can serve as suitable secondary reference materials for in situ U-Pb geochronology. In addition, Daibosatsu is suitable as a secondary reference material for Cenozoic Th-Pb dating to monitor data reproducibility.
Language:
English
Type:
info:eu-repo/semantics/article
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