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Baddeleyite U-Pd dating method based on LA-ICP-(Q)MS (Laser Ablation-Inductively Coupled Plasma-(Quadrupole) Mass Spectrometer)

A technology of baddeleyite zircon and calculation method, which is applied to measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of difficulty in collecting baddeleyite zircon samples, low calibration accuracy, and poor effective control of element fractionation effects.

Inactive Publication Date: 2017-03-08
XIAN CENT OF GEOLOGICAL SURVEY CGS
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Problems solved by technology

[0004] The purpose of the present invention is to provide a LA-ICP-(Q)MS-based baddeleyite U-Pb dating method, which aims to solve the existing difficulties in baddeleyite sample collection, poor effective control of element fractionation effect, and correction The problem of low accuracy

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  • Baddeleyite U-Pd dating method based on LA-ICP-(Q)MS (Laser Ablation-Inductively Coupled Plasma-(Quadrupole) Mass Spectrometer)
  • Baddeleyite U-Pd dating method based on LA-ICP-(Q)MS (Laser Ablation-Inductively Coupled Plasma-(Quadrupole) Mass Spectrometer)
  • Baddeleyite U-Pd dating method based on LA-ICP-(Q)MS (Laser Ablation-Inductively Coupled Plasma-(Quadrupole) Mass Spectrometer)

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[0021] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the baddeleyite U-Pb dating method based on LA-ICP-(Q)MS of the embodiment of the present invention comprises the following steps:

[0024] S101: Lock the sampling target to the basic or ultrabasic rock area with coarse mineral crystal grain size, and then carry out on-site testing of the candidate area with a hand-held X-ray fluorescence instrument, and select the area where the Zr element content display value is greater than 50 μg / g. sampling;

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Abstract

The invention discloses a baddeleyite U-Pd dating method based on a LA-ICP-(Q)MS (Laser Ablation-Inductively Coupled Plasma-(Quadrupole) Mass Spectrometer). A region of which the displayed value of the content of an element Zr is more than 50 mu g / g is selected to carry out sampling; laser ablation is carried out on baddeleyite by adopting a laser ablation system, and baddeleyite U-Pd dating analysis is carried out by adopting a plasma mass spectrometer; helium is adopted as a carrier gas and argon is adopted as a compensation gas to regulate sensitivity in a laser ablation process; a sample and a blank signal are selected, the sensitivity drift of an instrument is corrected, the U-Th-Pb isotope specific value and age are calculated, the zircon standard Phalaborwa is adopted as an external standard to carry out isotope fractionation correction, and the correction is carried out by utilizing the change of the Phalaborwa and by adopting a linear interpolation way. By using the baddeleyite U-Pd dating method based on the LA-ICP-(Q)MS, the effective collection on a baddeleyite sample and the effective control and the accurate correction on an elemental fractionation effect are realized.

Description

technical field [0001] The invention belongs to the technical field of isotope geochronology, and in particular relates to a baddeleyite U-Pb dating method based on LA-ICP-(Q)MS. Background technique [0002] The accurate determination of the age of basic and ultrabasic rocks is of great significance for earth science research. Xu Yigang (2013) made statistics. During the five-year period from 2008 to 2012, among the articles published in Nature, 118 were related to the study of mantle plumes, and 197 were related to plate tectonics. Its importance in scientific research is comparable to that of classical plate tectonic theory. In other words, the theory that the mantle plume is in place at the bottom of the lithosphere, accompanied by a large number of basic and ultrabasic magmatic events, is becoming more and more well-founded. Thermal perturbations brought about by mantle plume activities are triggers for supercontinent disintegration. Determining the exact time and glo...

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Application Information

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IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 李艳广汪双双靳梦琪
Owner XIAN CENT OF GEOLOGICAL SURVEY CGS
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