Expedition Objective Research (IODP Expedition 340): Diagenesis in tephra-rich marine sediments and the impact of reactive iron on enhanced carbon burial

这是一项远征客观研究计划，将使用从IODP exp. 340到小安的列斯群岛的样本。本研究旨在探讨白垩世沉积和成岩作用对沉积物化学、孔隙流体和海洋化学的影响。具体假说认为，低温沉积和成岩作用促进了有机碳的埋藏。它通过消耗氧化剂来达到这一目的，否则氧化剂会降解有机碳和/或将碳与金属结合。PI建议分析所有样品和孔隙水的主要元素和微量元素以及Sr同位素。PI还建议分析沉积物和孔隙水固体中的有机C、碳酸盐、碳同位素、活性铁和铝。这项工作有可能为海洋碳循环提供重要的约束条件。

This is an expedition objective research proposal that will use samples from IODP exp. 340 to the Lesser Antilles. This proposal seeks to examine the effect of tephra deposition and diagenesis on sediment chemistry, pore fluids, and ocean chemistry. The specific hypothesis is that tephra sedimentation and diagenesis promotes burial of organic carbon. It does this by consuming oxidizers that would otherwise degrade organic carbon and/or binding carbon to metals. The PI proposes to analyze major and trace elements and Sr isotopes, for all samples and pore waters. The PI also proposes to analyze organic C, carbonate, carbon isotopes, reactive Fe and Al for sediments and pore water solids. The work has the potential to provide an important constraint on the oceanic carbon cycle.