Shallow Stratigraphy, Structure, and Modern Depositional Processes along Margins of Small Detached Carbonate Platforms in an Active Tectonic Setting

活跃构造环境中小型独立碳酸盐台地边缘的浅层地层、结构和现代沉积过程

• 批准号: 8900040
• 负责人: Albert Hine
• 金额: $ 16.22万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-01 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900040&HistoricalAwards=false
• 关键词: Shallow; Stratigraphy; Structure; Modern; Depositional

The Nicaraguan Rise is a major structural/tectonic feature, consisting of detached carbonate platforms, that separates the southwestern and northwestern basins of the Caribbean Sea. During research cruises in March-April 1987 and May 1988, a large data set was collected that includes single-channel seismic reflection profiling data, bottom samples, SCUBA diver observations, remote operated vehicle and bottom camera pigment data. In their first two years of research, Hine and Hallock- Muller have discovered corresponding east-west gradients in platform depth (average bank top depth increases east to west), sediment facies (gradients from chlorozoan to chloralgal sediment types), benthic communities (algal-sponge dominance increases to the west), and biotic pigment concentrations (doubling east to west). Documentation of these gradients has important implications for understanding carbonate platform drownings in the geologic record. In addition, their seismic reflection data have provided new insights concerning the infilling of seaways, erosion/deposition on carbonate slopes, and tectonic influences on carbonate bank development. They have also discovered the first Halimeda bioherms to be described from the Caribbean. About two thirds of the data remain to be analyzed. This renewal grant will enable completion of this project examining processes controlling deposition on an important, but poorly known system of modern carbonate platforms.

鲁关隆起是一个主要的构造/构造特征， 由分离的碳酸盐台地组成， 加勒比海的西南和西北盆地。 在1987年3月至4月和1988年5月的研究航行中， 收集了一组数据，包括单道地震 反射剖面数据，海底样品，潜水员 观察、遥控飞行器和底部摄像机颜料 数据 在他们最初两年的研究中，海因和哈洛克- 穆勒发现了相应的东西梯度， 台地深度（平均岸顶深度由东向西增加）， 沉积相（从绿藻到绿藻沉积物的梯度 类型）、底栖生物群落（藻类-海绵优势增加， 西部）和生物色素浓度（东部加倍， 西）。 这些梯度的文档具有重要的 对了解碳酸盐岩台地淹没的影响 地质记录。 此外，他们的地震反射数据 提供了有关航道填充的新见解， 碳酸盐岩斜坡上的侵蚀/沉积和构造影响 对碳酸盐岩岸发育的影响 他们还发现， 第一个在加勒比海被描述的Halimeda生物礁。 大约三分之二的数据仍有待分析。 此续订 赠款将使该项目的审查过程完成 控制沉积在一个重要的，但鲜为人知的系统 现代碳酸盐岩台地。