A method for determining the age of micron-sized titanite with high precision
A high-precision, micron-level technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as inaccurate methods, and achieve the effect of improving accuracy, significant application value, and wide application prospects
Active Publication Date: 2021-11-16
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
This may be caused by the inaccuracy of the ion probe method for titanite (Reference 6: Rigby et al., 2011)
Method used
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[0059] Specific embodiments of the present invention will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.
[0060] In this paper, sample and standard are used to distinguish the sample to be tested from the standard sample, which is marked on the lower right of the ratio; measure and calibration are used to distinguish the directly measured value from the corrected value, which is marked on the upper right.
[0061] The meanings of the symbols, formulas and representatives involved in this application are as follows in Table 1:
[0062] Table 1
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[0065]
[0066] An embodiment of the present invention is a method for determining the high-precision age of micron-sized titanite, which uses titanite ...
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Abstract
The invention relates to the field of determining the age of titanite, and provides a method for determining the age of titanite with high precision. 56 Fe 16 o + The correlation between the measured lead-uranium ion ratio is corrected to obtain the corrected lead-uranium ion ratio; then according to the positive correlation between the corrected lead-uranium ion ratio and the measured uranium ion ratio, the corrected lead-uranium isotope of titanite is calculated Ratio; Finally, the lead-uranium age of titanite is obtained according to the corrected lead-uranium isotope ratio. The invention prepares titanite standard sample thin slices and unknown rock sample thin slices respectively, and combines the two into a combined sample target. Plating the sample target with conductive material, using electron microscope and energy spectrum to find the position of the titanite mineral; cleaning the sample target, plating the conductive material, using the secondary ion mass spectrometer to test the relevant ion signal of the titanite, and finally using the above method to determine the titanite mineral. stone age. The invention can solve the problem that the micron-sized titanite is difficult to be accurately dated, and has great application value.
Description
technical field [0001] The invention relates to the field of titanite age determination, in particular to a method for determining the high-precision age of micron-sized titanite. Background technique [0002] Isotope geochronology is a basic tool for exploring the temporal and spatial evolution of geological bodies and continental dynamics. Accurate isotope chronology research is of great significance in inverting geological historical events, exploring the dynamic background of diagenesis and mineralization and the genesis of ore deposits, especially for many metamorphic rocks and hydrothermal deposits where the sequence of multi-stage hydrothermal activities is not obvious Indispensable means in research. At present, there are many analytical methods, among which the radioisotope system dating is the basic method to obtain the absolute age in geological research, and the uranium-lead (U-Pb) system dating is the most suitable method in the current solid earth science chro...
Claims
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IPC IPC(8): G16C20/30G01N23/2258
CPCG01N23/2258G16C20/30
Inventor 凌潇潇李秋立刘宇唐国强李娇马红霞
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI