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: 9116500
• 负责人: Gregory Mountain
• 金额: $ 35.66万
• 依托单位: Columbia University
• 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 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116500&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，海洋钻探计划采用了一种采样策略，即在地震脊上钻测深横断面，以重建新生代碳酸盐的产生和溶解以及深水化学和循环的历史。该策略是从检查第四纪晚期海洋学历史的类似浅层取芯计划演变而来的。深度样线最浅处的碳酸盐积累量近似于上覆水域的碳酸盐生产力。如果这些地点靠近并且仅深度不同，则积累速率将记录碳酸盐溶解，这将受到底层水化学变化的控制。 本项目的目标是获取西赤道大西洋塞阿拉海隆的地震数据和岩心样本。塞阿拉海隆覆盖着厚厚的新生代沉积物，应该是深度横断面研究的理想地点。 此外，要获取的数据将构成针对该地区提出的详细 ODP 钻探计划的基础。