A method for determining geochemistry of at least one geological sample with laser-induced breakdown spectral measurements performed on the geological sample in a time variant manner with spectral acquisitions made after each of a plurality of measurement shots, spectral preprocessing performed as necessary, and subsequent analysis is applied to the collected data to determine at least one geochemistry parameter of the sample. The method can provide a rapid method to estimate thermal maturity of a sample, which does not require sample preparation, and which can be non-destructive with respect to portions of the sample. A system for performing the method also is provided.
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