Method for testing fourth-stage submarine hydrothermal sulfide age

A test method and technology for sulfides, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of poor age accuracy and repeatability, incomplete sample dissolution, etc., to achieve good data reliability and repeatability, and sample The effect of small dosage and low acid consumption

Inactive Publication Date: 2020-07-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of poor age accuracy and repeatability in the determination of Quaternary seabed sulfide uranium and thorium ages using MC-ICPMS in the prior art, the present invention designs a set of Quaternary seabed sulfide uranium and thorium ages Determination method, the application of this method can solve the problem of incomplete sample dissolution in the dating process, improve the accuracy and repeatability of U, Th isotope and uranium series dating data, and accurately determine the age of Quaternary marine sulfides. Simultaneously expanding the application of uranium series dating technology in Quaternary sulphide dating

Method used

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  • Method for testing fourth-stage submarine hydrothermal sulfide age
  • Method for testing fourth-stage submarine hydrothermal sulfide age
  • Method for testing fourth-stage submarine hydrothermal sulfide age

Examples

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preparation example 1

[0042] After swelling 10g of chloromethylstyrene-divinylbenzene copolymer microspheres with a degree of crosslinking of 8% with 40g of absolute ethanol, 15g of dodecyldimethylamine and 2,8-dimethylamine were added under stirring. A 40wt% methanol solution of mixed amine of aza-spiro[4,5]decane, in which the molar ratio of dodecyldimethylamine to 2,8-diaza-spiro[4,5]decane is 5:1, slowly stir, heat to 45℃ to react for 48h, after the reaction, rinse with 5wt% NaOH, rinse with a large amount of deionization until it is neutral, and vacuum dry to obtain strong basic anion exchange resin, hereinafter referred to as For anion exchange resin 1.

preparation example 2

[0044] The preparation method and conditions are the same as those in Preparation Example 1, except that the molar ratio of dodecyldimethylamine and 2,8-diaza-spiro[4,5]decane is 8: 1. Finally, anion exchange resin 2 is prepared.

preparation example 3

[0046] The preparation method and conditions are the same as those of Preparation Example 1, except that in the mixed amine solution added, the molar ratio of dodecyldimethylamine and 2,8-diaza-spiro[4,5]decane is 3: 1. Finally, anion exchange resin 3 is prepared.

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Abstract

The invention provides a method for testing the fourth-stage submarine hydrothermal sulfide age. The method comprises the steps of testing the U / Th isotope ratio of the submarine hydrothermal sulfideby adopting MC-ICPMS; and calculating the age of the 230Th uranium system. The method is characterized in that modified strongly basic anion exchange resin containing quaternary ammonium salt groups is adopted in U-Th separation and purification, and the modified strongly basic anion exchange resin is obtained after chloromethyl styrene-divinyl benzene copolymer microspheres react with long-chaintertiary amine and spiro-cyclic tertiary amine. According to the detection method disclosed by the invention, the seabed polymetallic sulfide dating sample is smaller in dosage and smaller in acid consumption; the operation is simple; sample dissolution is more complete; age test data are more accurate; and data reliability and repeatability are better. The technology is simple to operate. The uranium and thorium age of the fourth-stage seabed sulfide can be determined. The sample amount only needs tens of milligrams, and the precision of the determined isotope ratio of U to Th can be superior to 0.5%.

Description

Technical field [0001] The invention belongs to the field of geochemistry, and specifically relates to a method for testing the age of hydrothermal sulfide on the seabed of the Quaternary. Background technique [0002] The age of hydrothermal sulfides in the Quaternary period can provide important information for the formation and transformation mechanism of sulfide deposits, the history of submarine hydrothermal activities, and the growth rate of large-scale sulfide deposits. At present, the development and application of MC-ICPMS high-precision mass spectrometry technology has made dating technology more accurate and wider. MC-ICPMS uranium dating is considered to be the most reliable Quaternary dating method (Cheng et al. .,2000,2013; Shen et al.,2008,2013). At present, uranium-based dating technology is mainly applied to Quaternary carbonate samples, and seldom applied to Quaternary seabed hydrothermal sulfides, mainly because carbonate samples are easy to digest and contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/96
CPCG01N30/02G01N30/06G01N30/96G01N2030/065
Inventor 王立胜马志邦王学锋
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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