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

法属圭亚那Sinnamary的海岸泥波和巴布亚湾的斜坡状泥是发生大规模亚氧成岩作用的系统，代表了有效地使陆地和海洋有机物矿化的地点。 来自斯托尼布鲁克的纽约州立大学的两名科学家计划继续在这些热带移动的泥带进行研究，以完善他们对这些地点的地球化学过程的解释，确定移动的泥带与周围沉积环境之间的相互作用，完成关于自生作用和微生物代谢活动的实验室实验，并开发这两个地区的比较模型。 在法属圭亚那，专业人员希望评估在波浪迁移和红树林侵蚀过程中被带入亚氧移动的带的沉积物的性质。 在巴布亚湾，这个科学家小组将在西北季风和东南贸易期从红树林边缘到60米水深的前积区的大陆架上取样。 该项目的目标如下：（1）量化和模拟循环速率、反应途径、活性物质来源、生物碎屑的沉积储存和顶部1- 3米的营养物质矿化;（2）确定不稳定与稳定沉积过程在维持整个区域生物地球化学性质方面的相对作用：（3）确定底栖生物群落与特定地球化学/物理状况的联系和相互作用;（4）获得沉积自生矿物组合和生物痕迹记录，用于环境重建。 科学家小组将与来自华盛顿大学的科学家合作，他们将研究巴布亚湾的沉积动力学，以及澳大利亚科学家。

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.