喜马拉雅黑色页岩铜锌同位素数据

通过分析下马岭组黑色页岩中的Zn和Cu同位素数据，探讨中元古代海洋中Zn和Cu的生物地球化学循环。研究的样品来自华北板块的下马岭组，该组形成于中元古代。样品主要为黑色页岩，研究方法包括：使用热分析元素分析仪和稳定同位素质谱仪分析有机碳含量和碳同位素；通过感应耦合等离子体发射光谱（ICP-OES）和感应耦合等离子体质谱（ICP-MS）分析主要元素和微量元素；使用MC-ICP-MS进行Cu和Zn同位素分析。实验结果显示，Cu和Zn的浓度有很好的相关性，但Cu的富集程度低于Zn，Cu和Zn的同位素变化范围与现代海洋沉积物相似。基于Zn和Mo同位素质量平衡，中元古代有机Zn的埋藏比例约为现代海洋的一半。广泛分布的富含有机质的黑色页岩可能表明，中元古代的初级生产力增加，导致有机碳埋藏量增加，从而引发了大气-海洋的氧化。这一发现支持了中元古代时期生物生产力变化和有机碳埋藏增加推动了显著的氧气升高的假设。

By analyzing Zn and Cu isotope data from the black shales of the Xiamaling Formation, this study investigates the biogeochemical cycles of Zn and Cu in the Mesoproterozoic oceans. The studied samples are collected from the Xiamaling Formation of the North China Craton, which was formed during the Mesoproterozoic era. The samples are predominantly black shales. The research methods include: analyzing organic carbon content and carbon isotopes using a thermal analysis elemental analyzer and a stable isotope mass spectrometer; determining major and trace element concentrations via inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS); and conducting Cu and Zn isotope analysis with multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The experimental results show that the concentrations of Cu and Zn exhibit a strong positive correlation, but the enrichment degree of Cu is lower than that of Zn. The isotopic variation ranges of Cu and Zn are similar to those of modern marine sediments. Based on the mass balance of Zn and Mo isotopes, the burial ratio of organic Zn in the Mesoproterozoic oceans is approximately half of that in modern oceans. Widely distributed organic-rich black shales may indicate an increase in primary productivity during the Mesoproterozoic, which led to enhanced organic carbon burial and subsequently triggered atmospheric-oceanic oxidation. This finding supports the hypothesis that changes in biological productivity and increased organic carbon burial during the Mesoproterozoic drove a significant rise in atmospheric oxygen levels.