In Situ Sr-Nd Isotopic Measurement of Apatite Using Laser Ablation Multi-Collector Inductively Coupled Plasma-Mass Spectrometry
详细信息
- 责任者：Hou Kejun (Key Laboratory of Metallogeny and Mineral Assessment ; Ministry of Land and Resources ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Qin Yan
- 刊名：Rock and Mineral Analysis
- 出版年：2013
- 卷期：32(4)
- 关键词：ICP—MS ; inductively coupled plasma mass spectroscopy ; 锶同位素 ; strontium isotopes ; 钕同位素 ; neodymium isotopes
- 页码：p.547-554
- 图表：illus., 3 tables, 27 refs.
- 分类号：0900
- issnNo：ISSN0254-5357
- isbnNo：CN11-2131/TD
摘要
Apatite is a common accessory mineral,having a high Sr-Nd content and a low Rb content.The precise determination of micro-area Sr-Nd isotopic composition for apatite will provide important geochemical information for discussing the details of the geological process.Laser Ablation Multi-collector Inductively Coupled Plasma-Mass Spectrometry(LA-MC-ICPMS) technique has the characteristics of rapid analysis,high analytical precision and high spatial resolution,and is particularly suitable for Sr-Nd isotopic analysis of a large quantity of fine-grained apatite samples.The precise deduction of isotopic interference and calibration of instrument mass bias are crucial for in-situ analysis to obtain Sr-Nd isotopic ratio.In this article a method is described,which adopts LA-MC-ICPMS and combines with the newly published method for deduction of interferences,like Kr,Rb,divalent ions of REEs and calcium-containing polymer for Sr isotopes,Sm for Nd isotopes.The calibration of instrument mass bias is carried out,and the in-situ Sr-Nd isotopic analysis approach for apatite is established.The test results of Durango apatite standard,Apatite 1 and PE show that Sr-Nd isotopic composition of apatite sample with high Sr-Nd content can be accurately determined.The specific results are consistent with literature or the measured values by Thermal Ionization Mass Spectrometry(TIMS) within error.The measurement precision of Sr isotopes is <0.015%(2SD),and that of Nd isotopes is <0.005%(2SD).The established method is applied for Sr-Nd isotopic analysis of Durango apatite standard,Apatite 1 and PE(laboratory standard),respectively.The analysis results indicate that the Sr-Nd isotopic compositions of the three apatite samples are basically consistent,and can serve as ideal reference samples for in-situ Sr-Nd isotopic analysis.
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