In situ S isotopic analysis in apatite using laser ablation-multiple collector-inductively coupled plasma mass spectrometry

被引:2
作者
Li, Qinglin [1 ]
Zhang, Wen [1 ]
Hu, Zhaochu [1 ]
Feng, Yantong [2 ]
Hu, Hao [1 ]
Luo, Tao [1 ]
Huang, Jing [1 ]
Zeng, Xianli [1 ]
机构
[1] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
[2] Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China
基金
中国国家自然科学基金;
关键词
S isotope analysis; Apatite; LA-MC-ICP-MS; Reference materials; MC-ICP-MS; SULFUR ISOTOPES; ELEMENTAL SULFUR; FRACTIONATION; FLUORAPATITE; DELTA-S-34; EVOLUTION; MINERALS; SULFIDES; BEHAVIOR;
D O I
10.1016/j.chemgeo.2023.121651
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The S isotope composition (S-34/S-32) in apatite has been considered as a new powerful tool to trace S source reservoirs and to evaluate redox state and dynamic sulfur behavior in magmatic systems. This study presents the first in situ method to analyze S isotope compositions in apatite using laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). The sulfur isotope analysis of low-S apatite suffered the problem of high background interference, resulting in a low ratio of signal to noise (S/N). A detailed investigation found that similar to 50% background of S isotopes originated from memory effect in the aerosol particles transformation system and can be removed through careful cleaning or replacement. A linear regression calculation method was proposed instead of the traditional data reduction method to improve the performance of correcting the S background signal. Femtosecond laser ablation system (fs-LA) was used to reduce the thermal effect and suppress the potential fractionation of S isotopes during the laser ablation process, significantly improving the stability of delta S-34(V-CDT) values at different laser ablation parameters. Seven natural apatite samples with a large S concentration range were measured by the presented method. A good agreement of delta S-34(V-CDT) values between fs-LA-MC-ICP-MS and IR-MS was obtained. The reproducibility of delta S-34(V-CDT) obtained from fs-LA-MC-ICP-MS was similar to that in SIMS. These results confirm that the presented method can provide high-quality S isotopic compositions in natural apatites. Four apatite samples (Sly-1, Sly-2, MG, and OL-1) with various concentrations of SO3 (0.21% to 1.26%) show the homogeneous S isotope compositions based on the large amounts of repeated analyses using fs-LA-MC-ICP-MS. They are suggested as the high-quality external reference materials for in situ S isotope analysis for LA-MC-ICP-MS and SIMS.
引用
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页数:11
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