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The Genesis of Cyclic Limestones and Unconformities in the Northern Bahamas: Recent Processes and Ancient Analogs

巴哈马北部循环石灰岩和不整合面的成因：近期过程和古代类似物

基本信息

批准号：
8812492
负责人：
A. Conrad Neumann
金额：
$ 9.04万
依托单位：
University of North Carolina at Chapel Hill
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-10-15 至 1991-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8812492&HistoricalAwards=false
关键词：
Genesis Cyclic Limestones Unconformities Northern

项目摘要

The shallow limestones of the Bahamas accumulate in pulses. Each rise of the interglacial sea floods the banktops and superimposes another sediment cycle upon the remains of the former. To understand the geologic record of the last few sealevel rises, and more importantly, to contribute to the understanding of cyclic limestones worldwide, this project is focussed on the latest Bahamian depositional cycles and the erosional surfaces that separate them in both dished interior and ramped margin lagoonal study sites. The present phase of the study will concentrate on (1) the carbon isotopic signal of the organic fraction as a function of the depositional environment, (2) the spectrum of paleoecological information imprinted upon banktop discontinuity surfaces as they are modified by sealevel encroachment, (3) the geological/ geochemical nature of the present sediment cycle and the subjacent rock cycles, and (4) the geological/geochemical criteria derived from the cyclic deposition/erosion couplet that can be applied to ancient analogs. %%% The shallow limestones of the Bahamas accumulate in pulses. Each rise of the interglacial sea floods the banktops and superimposes another sediment cycle upon the remains of the former. To understand the geologic record of the last few sealevel rises, and more importantly, to contribute to the understanding of cyclic limestones worldwide, this project is focussed on the latest Bahamian depositional cycles and the erosional surfaces that separate them in both dished interior and ramped margin lagoonal study sites.

巴哈马群岛的浅层石灰岩呈脉冲状堆积。间冰期海的每次上升都会淹没河岸，又一个沉积物循环叠加在前者为了了解过去几年的地质记录更重要的是，了解全球循环石灰岩，该项目是重点关注巴哈马最新的沉积旋回和侵蚀面将它们分隔成两个碟形内部和斜坡边缘泻湖研究地点。的目前阶段本研究将集中在（1）碳同位素信号的有机组分作为沉积物的函数古生态信息谱印在半刚性不连续表面上，受海平面侵蚀的影响，（3）地质/ 地球化学性质的现代沉积物循环和次级岩石旋回;（4）地质/地球化学循环沉积/侵蚀对偶准则可以应用于古代的类似物。 %%% 巴哈马群岛的浅层石灰岩呈脉冲状堆积。间冰期海的每次上升都会淹没河岸，又一个沉积物循环叠加在前者为了了解过去几年的地质记录更重要的是，了解全球循环石灰岩，该项目是重点关注巴哈马最新的沉积旋回和侵蚀面将它们分隔成两个碟形内部和斜坡边缘泻湖研究地点。