Closing in on the carbonate uranium isotopes as a paleo-redox proxy based on continuous records from Late Oligocene to Holocene island carbonates

Carbonate diagenesis; Redox proxy; Uranium isotopes; Vanadium-uranium sequential enrichment; South China Sea碳酸盐成岩作用（Carbonate diagenesis）；氧化还原代用指标（Redox proxy）；铀同位素（Uranium isotopes）；钒铀顺序富集（Vanadium-uranium sequential enrichment）；南海（South China Sea）