A dataset on U–Pb dating and stable isotope results of Mesoproterozoic Carbonates in North China Craton

Table_raw shows the raw data of LA-ICP-MS U-Pb dating results in this study. Table_summary presents the summary of U-Pb dating, carbon and oxygen isotope results of dolomites. Eight matrix dolomites produced isochrons characterized by limited scatter in data points (MSWD average 2.5) and relative minor uncertainties (average 4.6%). Five of these analyzes produced U-Pb dates that are within error of the estimated stratigraphic ages, while the other three yielded significantly younger dates, offset by approximately 200 to 500 Ma. Eight U-Pb analyses of fracture-filling dolomites yielded isochrons with MSWD average 1.3, characterized by low uncertainties (average 2.5%) and slightly younger ages (ca. 1558-1295 Ma, average 1406 Ma). Four fracture-filling dolomites produced relative poor-quality isochrons, with significantly younger U-Pb dates ranging from ~1328 to 1045 Ma and larger associated uncertainties (average 11.8%). Eight samples yielded U-Pb dates clustering in the Mesozoic (median ca. 102 Ma), with relatively large uncertainties (average 20.7%). Three fracturing samples exhibit syn-stratigraphic initial 207Pb/206Pb values, one matrix sample yielded elevated 207Pb/206Pb, value while the remainder plot well below the terrestrial lead isotope evolution curve. The majority of dolomites exhibit a relatively narrow δ13C range, between –2.0 and 1.0 ‰ (VPDB), except for a few instances of slightly more negative δ13C values reaching approximately –5.0 ‰. In contrast, dolomites exhibit a relatively wide δ18O range from –13.3 to –5.26 ‰.