REU: Deep Water Carbonate Sedimentation in the Lesser Antilles Arc, Eastern Caribbean

拟议的研究将确定模式、过程和 小南海深水碳酸盐沉积的控制 安的列斯群岛弧。 本次研究将以全新世分析为基础 到晚更新世沉积物中的现有活塞和重力 丹 以下问题将得到解决：1。是什么 深水碳酸盐的来源和运移机制 弧中的沉积物，2.深水沉积物是否记录了 碳酸盐含量的周期性变化，碳酸盐矿物学， 与海平面对应的浊积岩的频率 波动？和3.如何影响碳酸盐沉积 受弧火山作用和南方陆源碎屑的输入 美国来源？ 岩心的地层框架将使用 有孔虫生物地层学、火山灰年代学和氧 同位素地层学 详细核心说明，共计 碳酸盐岩分析，薄片岩相学，扫描电镜 显微镜、X射线衍射和锶测定将 建立碳酸盐的分布， 远洋和浅海碳酸盐组分的贡献， 火山碎屑和陆源碎屑的比例。 这项研究是第一次深入分析现代 汇聚边缘的深水碳酸盐沉积。 它将 补充了以前对火山成因和陆源成因的研究 小安的列斯群岛的沉积物，以显示深水 火山弧的沉积作用与台地边缘的沉积作用相比 被动边缘环境中的沉积。 其成果将 有助于解释其他火山弧序列，包括现代 古装

The proposed research will identify patterns, processes and controls of deep-water carbonate sedimentation in the Lesser Antilles arc. The study will be based on analysis of Holocene to late Pleistocene sediments in existing piston and gravity cores. The following questions will be addressed: 1. what are the sources and transport mechanisms of deep-water carbonate sediments in the arc?, 2. do the deep-water sediments record cyclic variations in carbonate content, carbonate mineralogy, and frequency of turbidites that correspond to sea level fluctuations?, and 3. how is carbonate sedimentation affected by arc volcanism and input of terrigenous detritus form South American sources? A stratigraphic framework for the cores will be developed using foraminiferal biostratigraphy, tephrochronology, and oxygen isotope stratigraphy. Detailed core descriptions, total carbonate analyses, thin section petrography, scanning electron microscopy, x-ray diffraction, and strontium determinations will establish the distribution of carbonate, the relative contributions of pelagic and neritic carbonate components, and the proportions of volcanic and terrigenous detritus. The study represents the first in-depth analysis of modern deep-water carbonate sediments in a convergent margin. It will complement previous studies of volcanogenic and terrigenous sediments in the Lesser Antilles to show how deep-water deposition in a volcanic arc compares with periplatform sedimentation in passive margin settings. The findings will aid interpretation of other volcanic arc sequences, both modern ancient.