Fig. 4: Age and geochemistry of calcite-filled amygdules and fracture.
From: Paleozoic ocean plate stratigraphy unraveled by calcite U-Pb dating of basalt and biostratigraphy
A, C Shale-normalized REY patterns (rare earth elements and yttrium, REE + Y). Post-Archean Australian Shale (PAAS) after ref. 68, seawater after ref. 39, and low-temperature (low-T, <12 °C) hydrothermal fluid after ref. 38. B, D Tera-Wasserburg concordia plots showing 238U/ 206Pb vs. 207Pb/206Pb. MSWD mean squared weighted deviates.
