Fig. 2: The calculated δ³⁰Si_soil values of the residue soil after evaporation.

The effect of escape under different temperatures has been included in the calculation. Two different \({{{{\rm{\alpha }}}}}_{{}^{30}{{{\rm{Si}}}}}\) values are used in the calculation. (A) The ideal value of \({\alpha }_{{}^{30}{SiO}}\) is calculated by \({\alpha }_{{}^{30}{SiO}}\) = \(\sqrt{\frac{{{{\rm{m}}}}{}^{{{{\boldsymbol{28}}}}}{{{\rm{SiO}}}}}{{{{\rm{m}}}}{}^{{{{\boldsymbol{30}}}}}{{{\rm{SiO}}}}}}\), while (B) the measured \({\alpha }_{{}^{30}{Si}O}\) value of 0.98577 from experiment based on partial evaporation from Type B CAI liquids into vacuum⁴⁴. f_melt represents the fraction of the residue soil in the evaporation process. The red line represents the free evaporation process, while the colored area represents the combined effects of free evaporation, partial escape, and full recondensation processes. The sloped gray dotted line indicates a temperature scenario of 4000 K, and the horizontal gray dotted lines denote the mean δ³⁰Si values of CE-5 and CE-6 soils.