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

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。

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.