Supporting information for "Magnesium isotopes archive the initial carbonate abundances of metasedimentary rocks prior to thermal decarbonation"

The supporting information contains five supplementary texts, five figures, and seven tables.In this revised version, we added a new supplementary text (Text S5) that provided details of the bootstrap resampling method used in this study. We also added a new figure (Fig. S5) which indicated the Mg isotopic variations along with Mg/Ca ratios of compiled global carbonatesalso, and updated the Fig. S4 with considering the errors from bulk δ²⁶Mg, ICAs and the uncertainty arising from the scattering of dataset. In the revised Table S5, δ²⁶Mg for initial carbonates and their errors were listed. In addition to the changes noted above, other typos and editorial errors have been corrected.

本补充材料包含5篇补充文本、5幅附图及7张附表。在本次修订版本中，我们新增了一篇补充文本（Text S5），详述了本研究采用的自助重采样法（bootstrap resampling）。此外，我们还新增了一幅附图（Fig. S5），用于展示汇编全球碳酸盐的镁同位素变化与镁钙比值；同时对图S4（Fig. S4）进行了更新，纳入了全样δ²⁶Mg、ICAs的误差以及数据集离散性带来的不确定性。在修订后的附表S5（Table S5）中，列出了原始碳酸盐的δ²⁶Mg值及其误差范围。除上述修订内容外，本次修订还修正了其余排版笔误与编校差错。