A method for determining the age of high common lead zircons and the initial lead isotopic composition of the source region
A lead zircon and isotope technology, which is applied in the field of zircon age determination and source area tracing, can solve the loss of high common lead zircon trace information, unavailable high common lead age data, metallogenic age, metallogenic material Problems such as the inability to obtain key geological information of the source, etc., to achieve the effect of enriching source area information and reliable scientific basis
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0025] The zircon secondary ion mass spectrum age data in sub-alkaline rocks were selected as the research object. Secondary ion mass spectrometry has high mass resolution, so for low content 204 The detection of Pb is unique. In addition, the high spatial resolution of secondary mass spectrometry is helpful for obtaining multiple sets of data. Secondary ion mass spectrometry data can obtain harmonic age, isochron age and 207 Pb corrects age, and the three can be compared with each other to judge the rationality of isochron age.
[0026] A method for determining the age of high common lead zircons and the initial lead isotope composition of the source area, the method includes the following steps:
[0027] Step 1, high common lead zircon age data selection.
[0028] Select high common lead zircon age data 206 Pb / 204 The data with Pb204...
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