Coral-based rare earth element proxy for hydrothermal fluid on the Yongxing Island, South China Sea

Explanation: A systematic research on chronology, mineral compositions, geochemistry, particularly the rare earth elements of the SSZK1 well suggests that the YX-2300 coral bone formed at 114 ka have obvious positive Eu anomalies (A), and the model calculations suggest that at least 0.1% of hydrothermal fluids were added to the surrounding seawater during its growth (B and C).