Collaborative Research: The Flux of Carbon from a Modern Accretionary Prism; In-Situ Measurements of Hydrocarbon Sequestration as Gas Hydrates and Diagenetic Carbonate

在增生边缘，随着孔隙水从压实的沉积物中被挤压，沉积碳被循环利用。这些孔隙水以自然渗漏的形式排出，其中一些碳以厚厚的表层和次表层沉积，额外的碳可能被封存在天然气水合物中，而一些碳则以气态形式损失到水柱中。然而，人们对这些过程的相对比例和规模却知之甚少。本项目将开始一种原位的实验方法，以检查和量化俄勒冈州边缘的这些过程。采样室将安装在海洋钻探计划所钻的密封钻孔上，用于收集沉积剖面的沉淀物和流体。随后将对为期一年的实验样品进行分析，以提供有关流体排出过程中碳固存动力学的信息。这项研究不仅定义了流体和相关的成因沉积物的化学性质，还将随着时间的推移将沉积的质量与已知的流体体积联系起来，并测量沉积对沉积物渗透率的影响。微生物研究将探讨生物在控制碳分配中的潜在作用和重要性。＊＊＊

9712135 Kastner At accretionary margins sedimentary carbon is recycled as pore waters are squeezed from the compacting sediments. These pore waters are discharged at natural seeps where some of the carbon is deposited as thick surface and subsurface layers, additional carbon may be sequestered in gas hydrates, and some of the carbon is lost to the water column in gaseous form. The relative proportions and magnitude of these processes, however, are poorly understood. The present project will begin an in situ , experimental approach to examining and quantifying these processes on the Oregon margin. Sampling chambers will be fitted to sealed borehole drilled by the Ocean Drilling Program and will be used to collect precipitate and fluid flow out of the sedimentary section. Samples from the year long experiment will be subsequently analyzed to provide information on the kinetics of carbon sequestration during fluid expulsion. Not only will the research define chemistry of the fluids and associated digenetic deposits, it also will relate the mass deposited over time to a known volume of fluid, and measure the affect of that deposition on sediment permeability. Microbial research will examine the potential role and importance of organisms in controlling the carbon partitioning. ***