Deep-Tow Surveys of Atlantic Diapirs and Carbonate Escarpments: Geomorphology, Geochemical Processes and Geological Consequences

大西洋底辟和碳酸盐悬崖的深拖调查：地貌、地球化学过程和地质后果

• 批准号: 8911430
• 负责人: Charles Paull
• 金额: $ 8.73万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911430&HistoricalAwards=false
• 关键词: Deep; Tow; Surveys; Atlantic; Diapirs

"Deep-Tow Surveys of Atlantic Diapirs and Carbonate Escarpments: Geomorpholgy, Geochemical Processes and Geological Consequences" Earlier work by Paull and others along the West Florida Escarpment discovered cold water brine seeps that (1) support chemosynthesis in isolated biologic communities; and (2) contribute to erosion at the base of the carbonate platform. Evidence is mounting that the spectacular discharge of hot vent waters along spreading ridges may be volumetrically dwarfed by discharge along continental margins. In this proposal the PI plans to use Deep-Tow to extend investigations of suspected brine seeps to the eastern side of Florida. Two regions will be surveyed: a diapir on the continental rise off Georgia, and the base of the Blake-Bahama Escarpment. The diapir breaches the seafloor, and will be examined (1) to establish the chemistry of pore fluids and sediments brought to the seafloor, and (2) to determine the effects of this discharge on local erosion and biology. The nature of erosion will be examined along the precipitous Blake-Bahama Escarpment, and the possible contributions of tectonic, bottom current, and chemical destruction will be evaluated.

“大西洋底辟和碳酸盐悬崖的深拖调查：地貌、地球化学过程和地质后果”Paull 和其他人在西佛罗里达悬崖沿线的早期工作发现了冷水盐水渗漏，这些渗漏（1）支持孤立生物群落中的化学合成； (2) 导致碳酸盐台地底部的侵蚀。 越来越多的证据表明，热喷口水沿扩张脊的壮观排放在体积上可能比沿大陆边缘的排放相形见绌。在该提案中，PI 计划使用 Deep-Tow 将疑似盐水渗漏的调查范围扩大到佛罗里达州东部。将调查两个区域：乔治亚州大陆隆起的底辟，以及布莱克-巴哈马悬崖的底部。底辟突破海底，将进行检查（1）以确定带入海底的孔隙流体和沉积物的化学性质，以及（2）确定这种排放对当地侵蚀和生物的影响。 将沿着陡峭的布莱克-巴哈马悬崖研究侵蚀的性质，并评估构造、底部水流和化学破坏的可能贡献。