In:
Journal of Analytical Atomic Spectrometry, Royal Society of Chemistry (RSC), Vol. 37, No. 9 ( 2022), p. 1776-1786
Kurzfassung:
In this study, we developed a method for measuring Sm–Nd isotopic ratios in samples with low Nd contents ( 〈 100 μg g −1 ) by LA-MC-ICP-MS. The use of jet sample and X skimmer cones, with the addition of a small water vapour flow (∼5 mL min −1 ) significantly improved the instrumental sensitivity by a factor of 1.9–3.6, and has little effect on Nd instrumental mass bias. The accuracy and precision of our analytical method is demonstrated by analysis of eight geological reference glasses (Nd = 21.4–60.9 μg g −1 ). The obtained Sm–Nd isotope data are consistent with their recommended values. The measurement of a clinopyroxene megacryst (JLM-1) indicates that matrix effects on 147 Sm/ 144 Nd calibration between clinopyroxene and the measured geological reference glasses are insignificant. The inverse correlation between the analytical precision and the Nd signal intensity shows that the 143 Nd/ 144 Nd internal precision is 〈 120 ppm (2s) for a 146 Nd signal 〉 0.15 V, whereas the 143 Nd/ 144 Nd internal precision is 〈 80 ppm (2s) for a 146 Nd signal 〉 0.3 V. The addition of water vapour did not suppress the matrix effects for 147 Sm/ 144 Nd calibration. The Sm–Nd isotopic compositions of the Panzhihua clinopyroxene measured with our method indicate that the Panzhihua layered intrusion behaved as a closed magmatic system that experienced limited crustal contamination. The method presented in this study is a rapid and accurate technique for in situ analysis of Sm–Nd isotopes of low-Nd samples, such as volcanic glass, clinopyroxene and hornblende.
Materialart:
Online-Ressource
ISSN:
0267-9477
,
1364-5544
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2022
ZDB Id:
1484654-8
ZDB Id:
54176-X
SSG:
11
