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Dynamic multi-acceptance zircon id-tims Pb isotope determination method with multiple ion counters

A measurement method and counter technology, applied in the method of using particle spectrometer, ion source/gun, parts of particle separator tube, etc., can solve the problem of time-consuming and laborious, differential stability, precision and accuracy are not ideal and other problems, to achieve the effect of improving the measurement accuracy and improving the utilization efficiency.

Inactive Publication Date: 2020-08-11
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the gains (Gain) of different ion counters of the multi-ion counter system are different and the stability is poor, after each sample is measured by the multi-ion counter static method, it is necessary to measure a standard such as NIST981 or NIST982 Pb to calibrate the multi-ion counter. The gain difference between them is still relatively time-consuming
Moreover, even so, due to the poor stability of the ion counter gain, the precision and accuracy of the Pb isotope determination results are still not ideal when using a multi-ion counter to determine Pb isotopes in a static multi-receiving manner
Therefore, the application of the current multi-ion counter system in the actual isotope determination work is limited

Method used

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  • Dynamic multi-acceptance zircon id-tims Pb isotope determination method with multiple ion counters
  • Dynamic multi-acceptance zircon id-tims Pb isotope determination method with multiple ion counters
  • Dynamic multi-acceptance zircon id-tims Pb isotope determination method with multiple ion counters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 205 Pb Isotope Analysis of Pb-NIST981 Mixed Standard

[0058] The present invention first to NSIT981 standard solution and 205 Pb isotope determination was carried out on the mixed solution of Pb diluent, and the precision and accuracy of the test method were investigated. And the Pb isotope determination result of the multi-ion counter dynamic multi-receiving method of the present invention is compared with other methods, including: the multi-ion counter static multi-reception method and the Pb isotope determination result of the single-ion counter skipping method.

[0059] 205 Pb-NSIT981 mixed solution is prepared as follows: take 205 Pb- 235 U Thinner ( 205 Pb concentration 9.223pmol / g; 204 Pb, 205 Pb, 206 Pb, 207 Pb, 208 Pb abundances are 0.0046%, 99.85%, 0.0384%, 0.0308%, 0.0731%) 500μL and 290ng / g NBS981 standard solution 50μL, put into a 3mL Teflon PFA cup, mix well, place on an electric heating plate at 80°C and seal Reflux for at least a week to ensu...

Embodiment 2

[0069] ID-TIMS U-Pb Age Determination of Qinghu Zircon Standard Sample

[0070] The Qinghu zircon standard sample is a monitoring standard sample for SIMS and LA-ICP-MS age determination. The ID-TIMS method has been used to determine the U-Pb age. 206 Pb / 238 The U-weighted mean age was 159.45±0.16Ma (±2SE) (see literature 2). Recently, the ID-TIMS U-Pb laboratory of the Massachusetts Institute of Technology also carried out ID-TIMS age determination on this zircon. 206 Pb / 238 The U-weighted mean age is 159.36±0.06Ma (±2SE).

[0071] This disclosure carried out ID-TIMS U-Pb age determination on this standard zircon, using 205 For Pb diluent, see reference 1 for sample processing methods. In the process of mass spectrometry, the Pb isotope is measured by the multi-ion counter dynamic method of the present disclosure, and U is measured by the central channel SEM skip scan. 206 Pb / 204 The Pb measurement results are between 360 and 2560, and the age measurement results ar...

Embodiment 3

[0074] TEMORA Zircon Standard ID-TIMS U-Pb Age Determination

[0075] TEMORA zircon is the international zircon age standard sample. The ID-TIMS method has been used to determine the U-Pb age of it before, and the obtained 206 Pb / 238 The U-weighted mean age was 416.78±0.33Ma (±2SE) (see literature 3). Recently, we also carried out ID-TIMS age determination on this zircon in the ID-TIMS U-Pb laboratory of the Massachusetts Institute of Technology, USA. 206 Pb / 238 The U-weighted mean age was 417.71±0.12Ma (±2SE).

[0076] The present disclosure carried out ID-TIMS U-Pb age determination on the standard zircon, similar to Example 2, using 205 For Pb diluent, see reference 1 for sample processing methods. In the process of mass spectrometry, the Pb isotope is measured by the multi-ion counter dynamic method of the present disclosure, and U is measured by the central channel SEM skip scan. 206 Pb / 204 The results of Pb determination are between 300 and 2630, and the result...

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Abstract

The invention discloses a dynamic multi-receiving zircon ID-TIMS Pb isotope determination method of a multi-ion counter. Compared with the general multi-ion counter static measurement method, this method completely eliminates the influence of the multi-ion counter gain difference on the Pb isotope determination results; compared with the traditional single-ion counter five-time peak-jump measurement method, this method is sufficient for two peak-jumps All the Pb isotope ratios are obtained, which improves the receiving efficiency of the Pb isotope ion flow and reduces the influence of the ion flow stability on the Pb isotope analysis results. Therefore, the inventive method can improve the single particle zircon isotope dilution thermal ionization mass spectrometry (ID-TIMS) U-Pb dating method (using 205 Pb diluent) Pb isotope analysis accuracy, has application potential.

Description

technical field [0001] The invention belongs to the technical field of isotope mass spectrometry analysis, and in particular relates to a dynamic multi-receiving Pb isotope determination method of a multi-ion counter applied to a single particle zircon ID-TIMS U-Pb dating technology. Background technique [0002] The zircon U-Pb method is the most important isotope geochronology method, which is widely used in the dating of various geological bodies, such as the formation age of granite and the determination of stratigraphic age, etc. At present, zircon U-Pb methods mainly include: secondary ion mass spectrometry (SIMS), laser ablation plasma mass spectrometry (LA-ICP-MS) micro-area in situ method, and isotope dilution thermal ionization mass spectrometry (ID-TIMS) method. Among them, the ID-TIMS method has the characteristics of high precision and is the benchmark method for zircon U-Pb age determination. In recent years, with the continuous improvement of analysis technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/626H01J49/16H01J49/28H01J49/025H01J49/0027G01N30/72G01N2030/8868H01J49/0036
Inventor 储著银王伟李潮峰刘文贵许俊杰郭敬辉
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI