Biogeochemical Cycling and Authigenic Mineral Formation in Suboxic Tropical Mobile Mud Belts

法属圭亚那Sinnamary的沿海泥石波和巴布亚海湾的床状泥浆是发生大规模亚氧成岩作用的系统，代表了有效地重新矿化陆地和海洋有机质的场所。纽约州立大学石溪分校的两名科学家计划继续他们在这些热带流动泥质带的研究工作，以完善他们对这些地点的生物地球化学过程的解释，确定活动泥质带与周围沉积环境之间的相互作用，完成关于自生和微生物代谢活动的实验室实验，并开发这两个区域的比较模型。在法属圭亚那，PI希望评估沉积物质的性质，这些物质在波浪迁移和红树林侵蚀期间被带入亚氧活动区。在巴布亚海湾，这组科学家将在西北季风和东南贸易期间，在60米水深的从红树林边缘到前海区域的大陆架上进行采样。该项目作为该地点的目标如下：(1)量化和模拟1-3m表层的循环速率、反应途径、活性物质来源、生物碎片的沉积储存和营养物质再矿化；(2)确定非稳定和稳定的沉积过程在维持整个区域的生物地球化学性质方面的相对作用；(3)描述底栖生物群落与特定的生物地球化学/物理系统的联系和相互作用；以及(4)获得环境重建所需的沉积自生矿物群和生物成因痕迹记录。科学家团队将与华盛顿大学的科学家以及澳大利亚科学家合作，后者将研究巴布亚海湾的沉积物动力学。

ABSTRACTOCE-0219919The coastal mud wave at Sinnamary, French Guiana and the clinoform muds in the Gulf of Papua are systems wherein massive suboxic diagenesis takes place and represent sites that effectively remineralize terrestrial and marine organic matter. Two scientists from the State University of New York at Stony Brook plan to continue their research efforts in these tropical mobile mud belts to refine their interpretations of the biogeochemical processes at these sites, determine the interaction between the mobile mud belts and surrounding sedimentary environments, complete laboratory experiments on authigenesis and microbial metabolic activity and develop comparative models of these two regions. In French Guiana, the PIs hope to assess the properties of sedimentary material which becomes entrained into the suboxic mobile zone during wave migration and mangrove erosion. In the Gulf of Papua, this team of scientists will sample across the shelf from the mangrove fringe to the foreset region at 60m water depth during the NW Monsoon and SE Trade Period. The goals of the project as this site are the following: (1) quantify and model cycling rates, reaction pathways, reactive material source, sedimentary storage of biogenic debris and nutrient remineralization in the top 1-3m; (2) determine relative role of unsteady versus steady sedimentation processes in maintaining the biogeochemical properties across the region: (3) characterize the associations and interactions of benthic biological communities with particular biogeochemical/physical regimes; and (4) obtain sedimentary authigenic mineral suites and biogenic trace records for environmental reconstruction. The team of scientists will collaborate with scientists from the University of Washington whom will be looking at the sediment dynamics of the Gulf of Papua, as well as Australian scientists.