A Multi-Disciplinary Amazon Shelf Sediment Study (AmasSeds)

该项目是早期项目的延续， 调查了细颗粒沉积物在 亚马逊河河口附近的大陆架。 的 最早的研究证明， 后来的研究发现， 控制积累的过程。 该项目将研究 详细介绍了这些过程的运作以及它们如何影响 沉积地层的形成 这项新研究将 作为AmasSeds的沉积学和地层学部分完成 （多学科亚马逊大陆架沉积物研究），这是一个 美国和巴西科学家的合作项目。 的 该项目涉及物理，化学， 生物和地质科学。 %%% 该项目将研究全新世地层的机制 在一系列的时间和垂直长度尺度上形成。 将使用几种放射化学方法评价时间尺度 技术（Th-234，Pb-210，Cs-137，C-14）和长度尺度将 使用一系列取芯（盒式岩心，卡斯滕岩心， 活塞岩心、钻孔）和高分辨率地震技术 （3.5 kHz系统，低频系统）。 合作 其他AmasSeds小组将提供有关 控制地层形成的沉积作用， 由此产生的地层学特征将是一系列的 观察技术（SEM，光学显微镜，x- 射线照相术、地震地层学）。 该研究源于 从它对一个主要水下三角洲的评价来看， 这是典型的最大的河流扩散系统 世界上最大的沉积物 这些大型系统具有深刻的 对现代海洋的影响，并有很好的潜力， 达到地质记录。 研究区域是 亚马逊河河口附近的大陆架， 与此相关的先前研究允许 建立和检验先进的假设， 地层形成

This project is a continuation of an earlier project that investigated the accumulation of fine-grained sediment on the continental shelf near the mouth of the Amazon River. The earliest research proved that sediment was actively accumulating, and later research identified the sedimentary processes controlling accumulation. This project will examine in detail the operation of the processes and how they affect the formation of sedimentary strata. This new research will be done as the Sedimentology and Stratigraphy portion of AmasSeds (A Multi-disciplinary Amazon Shelf SEDiment Study), which is a cooperative project between US and Brazilian scientists. The project involves collaboration of Physical, Chemical, Biological, and Geological Sciences. %%% The project will examine mechanisms of Holocene strata formation over a range of time and vertical-length scales. Time scales will be evaluated using several radiochemical techniques (Th-234,Pb-210, Cs-137, C-14) and length scales will be examined using a range of coring (box cores, kasten cores, piston cores, borings) and high-resolution seismic techniques (3.5-kHz system, lower-frequency system). Cooperation with the other groups of AmasSeds will provide much information about the sedimentary processes controlling strata formation, and the resulting stratigraphy will be characterized by a range of observational techniques (SEM, optical microscopy, x- radiography, seismic stratigraphy). The research derives importance from its evaluation of a major subaqueous delta, which is typical of the largest dispersal systems for fluvial sediment in the world. These large systems have a profound influence on modern oceans, and have a good potential for reaching the geological record. The study area is the continental shelf near the mouth of the Amazon River, where the previous research associated with this grant allows establishment and testing of advanced hypotheses regarding strata formation.