Three Dimensional Chronostratigraphy and Regional Sea Level History in Bahamian Carbonate Platforms

巴哈马碳酸盐台地的三维年代地层学和区域海平面历史

• 批准号: 9005354
• 负责人: Donald McNeill
• 金额: $ 11.79万
• 依托单位: University of Miami
• 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: 1990-11-15 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005354&HistoricalAwards=false
• 关键词: Three; Dimensional; Chronostratigraphy; Regional; Sea

This research will further develop a three-dimensional chronostratigraphic framework of a carbonate platform, and, secondly, to extract a platform flooding history (relative sea level curve) from a high energy, windward bank margin. The extremely successful magnetostratigraphic dating of four 60-m cores from Little Bahama Bank is beginning to unravel the nature of platform deposition. This dating technique has renewed interest and understanding of carbonate platform depositional models and has extended age control beyond the Late Pleistocene and Holocene. The new Little Bahama Bank chronostratigraphy reveals a considerably different depositional sequence than proposed from just lithostratigraphy. This project will complete the remaining cores from the platform and extend downward the existing reversal stratigraphy to achieve the first three-dimensional platform history. The second part of this project will consist of dating three cores from the eastern side of Great Bahama Bank, part of a high-energy/bank interior facies that preserves a record of platform flooding (regional sea level curve) events.

这项研究将进一步建立碳酸盐台地的三维年代地层格架，其次，从高能、迎风的岸边提取台地泛滥历史(相对海平面曲线)。来自小巴哈马浅滩的四个60米岩心的磁性地层测年非常成功，开始揭开台地沉积的本质。这种测年技术重新引起了人们对碳酸盐台地沉积模式的兴趣和认识，并将年龄控制延伸到了晚更新世和全新世。新的小巴哈马海岸年代地层学揭示了一个与仅从岩石地层学提出的相当不同的沉积序列。该项目将完成从平台上剩余的岩心，并向下延伸现有的反转地层，实现第一个三维平台历史。该项目的第二部分将包括来自大巴哈马浅滩东侧的三个岩芯的年代测定，这是保存平台洪水(区域海平面曲线)记录的高能/岸内相的一部分。