铁对有机碳的长期保存及古海洋极端事件响应OA
Long-term preservation of organic carbon by iron and its response to paleo-marine extreme events
海洋表层沉积物有机碳超 20%以铁结合态有机碳(Fe-OC)的形式保存,深入分析 Fe-OC 的长期保存及其对古海洋极端事件的响应对理解全球碳循环和气候变化具有重要意义.本文梳理了海洋沉积物中 Fe-OC 的结合和释放机制及其导致的组成分异、区域分布特征及成岩作用对 Fe-OC 长期稳定性的影响,并探讨了古元古代大氧化事件、新元古代"雪球地球"事件、中生代海洋缺氧事件及第四纪冰期-间冰期旋回对 Fe-OC 形成与长期保存的潜在影响.研究发现,Fe-OC 的富集受沉积环境诸多因素的控制,其中铁的氧化还原过程是关键因素,对 Fe-OC 具有保存和降解的双重作用.古海洋极端事件通过改变铁的氧化还原循环及其与有机碳的相互作用对 Fe-OC 形成及长期保存产生潜在影响.
Over 20%of organic carbon in marine surface sediments is preserved as iron-bound organic carbon(Fe-OC),and comprehensive analysis of its long-term preservation and responses to paleo-oceanic extreme events holds significant implications for understanding global carbon cycling and climate change.We reviewed the binding/release mechanisms of Fe-OC in marine sediments,compositional differentiation,regional distribution patterns,and the influence of diagenesis on the long-term stability of Fe-OC in marine sediments,and explored the potential influences of major geological events—the Great Oxidation Event of the Paleoproterozoic,the Neoproterozoic"Snowball Earth"event,Mesozoic oceanic anoxic events,and Quaternary glacial-interglacial cycles—on the formation and long-term preservation of Fe-OC.in addition,we revealed that the enrichment of Fe-OC was controlled by various factors in sedimentary environments,in which redox processes of iron played a critical role and had dual effects of preservation and degradation on Fe-OC.Paleo-oceanic extreme events likely modulated Fe-OC dynamics by altering iron redox cycling and its interactions with organic carbon.
彭传沼;包锐;朱茂旭
中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛 266100中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛 266100中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛 266100
海洋科学
海洋沉积有机碳活性铁铁结合态有机碳长期埋藏古海洋极端事件
marine sedimentary organic carbonreactive ironiron-bound organic carbonlong-term burialancient marine extreme events
《海洋地质与第四纪地质》 2026 (3)
177-186,10
青年科学基金项目(A类)原国家杰出青年科学基金项目"海洋碳-14有机地球化学"(42525604)国家自然科学基金项目"受河流输入影响的陆架海沉积物中厌氧代谢驱动的总碱度产消机制及输出通量研究"(42476036)
评论