U-Pb dating data correction method for sphene, storage medium and correction equipment

Abstract

The invention belongs to the technical field of laser denudation testing, and discloses a U-Pb dating data correction method for sphene, a storage medium and correction equipment. The method comprisesthe steps: firstly debugging an analysis instrument ICP-MS to an optimal state, and then loading a to-be-tested sample into a denudation sample pool; secondly, performing denudation and analysis on the to-be-detected sample by utilizing laser connection ICP-MS to obtain an isotope ratio of the to-be-detected sample; and then, according to a power function curve fitting equation, taking the isotope ratio at the initial moment as the isotope ratio of the sample, and performing final analysis and calculation by utilizing a Titan-Cal calculation principle to finally obtain the U-Pb age of the sphene. According to the invention, the problem that the test cannot be accurately completed without a sphene standard sample is solved. The method focuses on being applied to auxiliary minerals capableof detecting the age of a medium-high temperature geologic body, the auxiliary minerals become complex in component due to the fact that the auxiliary minerals are easy to be affected by the surrounding environment, the common lead content of the auxiliary minerals is high, later correction is difficult, and few research exists at present.

Description

technical field [0001] The invention belongs to the technical field of laser ablation testing, in particular to a correction method for LA-ICP-MS titanite U-Pb dating data. Background technique [0002] At present, the commonly used existing technology in the industry is as follows: in the work of LA-ICP-(Q)MS titanite U-Pb dating, the common test method is to make titanite particles into a sample target, put the sample target into the sample In Chi, a laser ablation system was used to ablate the titanite, and finally a plasma mass spectrometer was used to analyze the U-Pb dating of the titanite. During the laser ablation process, helium was used as carrier gas and argon as compensation gas to adjust the sensitivity, and the two were mixed through a T-junction before entering the ICP-MS. Insert a set of standard sample points for each analysis of 5 unknown sample points, and the standard samples are sphene BLR-1, zircon 91500 or zircon GJ-1. After the experiment process is...

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Problems solved by technology

[0004] In summary, the existing problems in the prior art are: the titanite standard sample used in the prior art is purchased from abroad, and the test cost is high; The error of the result is relatively large, the main reason is that the premise of the application of the traditional calibration method is that the sample to be tested and the standard sample must have the same fractionation behavior. It is bound to be impossible to obtain accurate age data

[0005] Difficulty in solving the above technical problems: The difficulty in solving this problem lies in that not all titanite found in nature can be used as standard samples. If a mineral wants to be used as a standard sample, the composition must first be very uniform and can be well The test results can be calibrated accurately, and it can guarantee a steady stream of output, otherwise the standard sample found after a lot of hard work will not be available for a long time, just like a zircon standard sample GJ-1 commonly used in testing now, it is A gem-quality zircon of natural origin, which has been used as a standard sample for only a few years, is no longer available, but many researchers in the industry have developed the habit of using it as a standard sample in the analysis process, and finally have to change it. Other standard samples, or continue to search for new standard samples, this is a very painful and not necessarily fruitful process

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