Diluent-free dating method for measuring phosphorite (U-Th)/He

A technology of apatite and diluent, which is applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as limited acquisition channels, expensive diluents, and restrictions on the application of apatite, and achieve the goal of reducing costs Effect

Inactive Publication Date: 2018-08-28
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

At present, in the field of apatite (U-Th)/He isotopic dating, domestic and foreign technicians mainly use the isotope dilution method to test the isotopes of uranium and thorium. Sourced from abroad, the acquisition of radioisotopes is restricted by various conditions
In recent years, many (U-Th)/He dating laboratories have been established in Ch

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  • Diluent-free dating method for measuring phosphorite (U-Th)/He

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0030] The present invention will be further described below in conjunction with the accompanying drawings and ...

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Abstract

The invention provides a diluent-free dating method for measuring phosphorite (U-Th)/He. The method comprises the following steps: firstly measuring and calculating the dimensions, volume and weight of to-be-tested phosphorite particles, then testing the content of 4He on a gas mass spectrograph, then using a nitric acid dissolution sample to prepare a solution, configuring a standard solution ofuranium and thorium with different concentrations, testing on an inductive coupling plasma mass spectrum and drawing a working curve, combining the working curve to calculate the concentrations of U and Th in the solution, and finally using the concentrations of uranium and thorium and the weight of the particles to calculate the content of uranium and thorium, so as to obtain the age of mineralsto be measured together with the content of 4He. Compared with an original dating year, the restricted problem of a diluent is solved; and through the calculation in the method, the age of the minerals to be measured is obtained, so that the method is applied to the research of geological process.

Description

technical field [0001] The invention belongs to the technical field of mineral isotope chronology, in particular to a method for determining apatite (U-Th) / He dating without a diluent. Background technique [0002] Apatite (U-Th) / He geochronology is a low-temperature (thermo) geochronology method developed rapidly in recent decades. Extended medium and low temperature thermochronology (such as 40 Ar / 39 The lower temperature limit of Ar, FT, etc.) makes it have broad application prospects in the study of major geological and geographical issues such as neotectonics, landform evolution, and environmental changes. The determination of the age of apatite (U-Th) / He needs to test the daughter isotopes ( 4 He) and parent isotope ( 238 U, 232 Th). At present, in the field of apatite (U-Th) / He isotopic dating, domestic and foreign technicians mainly use the isotope dilution method to test the isotopes of uranium and thorium. Sourced from abroad, the acquisition of radioisotop...

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Application Information

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IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 吴林
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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