Cenozoic Deep Water History on Ceara Rise: An Integrated Geophysical and Sedimentological Survey

塞阿拉隆起的新生代深水历史：综合地球物理和沉积学调查

• 批准号: 9116303
• 负责人: William Curry
• 金额: $ 34.2万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116303&HistoricalAwards=false
• 关键词: Cenozoic; Deep; Water; History; Ceara

During the last few years, the Ocean Drilling Program has employed a sampling strategy in which bathymetric transects are drilled on aseismic ridges in order to reconstruct the Cenozoic history of carbonate production and dissolution, and deep water chemistry and circulation. This strategy has evolved from similar shallow coring programs examining late Quaternary oceanographic history. Carbonate accumulation in the shallowest sites of the depth transect approximates carbonate productivity in the overlying waters. If the sites are close together and only vary in depth, the accumulation rates will record carbonate dissolution which will be controlled by changes in bottom water chemistry. The objective of the present project is to acquire seismic data and core samples from the Ceara Rise in the western equatorial Atlantic. The Ceara Rise is capped by a thick section of Cenozoic sediments and should be an ideal site for a depth transect study. Additionally, the data to be acquired will form the basis for a detailed ODP drilling program which has been proposed for this area.

在过去的几年中，海洋钻井计划采用了采样策略，在该策略中，在无性脊脊上钻了测深的样带，以重建碳酸盐生产和溶解的新生代历史，以及深水化学和循环。该策略是从研究晚期海洋历史的类似浅芯计划演变而来的。在深度样带的最浅的位置碳酸盐积累近似于上覆水中的碳酸盐生产力。如果这些地点靠近并且只有深度变化，则积累速率将记录碳酸盐溶解，这将由底部水化学的变化控制。 本项目的目的是从西赤道大西洋的CEARA崛起中获取地震数据和核心样本。 CEARA的上升由厚的新生代沉积物限制，应该是深度横切研究的理想位置。 此外，要获取的数据将构成为该领域提出的详细ODP钻井程序的基础。