Diagenetic Processes and Authigenic Mineral Formation in Amazon Shelf Sediments

本研究将：(1)对季节性采集的样品和活塞岩心进行全面分析，旨在记录控制陆架相成岩反应优势和反应速率的物理、生物和化学因素；(2)利用C1和氟利昂剖面定量分析成岩输运机制和平均盐度边界条件；(3)开发含铁矿物形成和转化的广泛带；(4)结合水柱研究，确定陆架底部沉积物中富铁红土碎屑大量减少对微量溶质（如U、Se、As）向内陆海洋输送的影响；(5)记录这些环境的地球化学和相关底栖生物指标可能记录在岩石记录中；(6)研究和评价亚马逊陆架与古代铁矿物沉积环境之间可能存在的相似性。将强调多学科综合。

This study will: (1) complete analysis of seasonally collected samples and piston cores, designed to document physical, biological, and chemical factors controlling diagenetic reaction dominance and rates of reactions in shelf facies, (2) utilize C1 and freon profiles to quantify diagenetic transport mechanisms and mean salinity boundary conditions, (3) exploit the extensive zones of Fe-mineral formation and transformation; (4) determine, in conjunction with water column studies, the influence of extensive reduction of Fe-rich lateritic debris in shelf bottom sediments on the transport of minor solutes (e.g. U, Se, As) to the interior ocean; (5) document the geochemical and associated benthic biological indicators of these environments likely to be recorded in the rock record; and (6) examine and evaluate possible similarities between the Amazon shelf and ancient environments of iron mineral deposition. Multidisciplinary integration will be emphasized.