Sedimentology and Diagenesis of Phanerozoic Hardgrounds

显生界硬地层的沉积学和成岩作用

• 批准号: 8904905
• 负责人: Philip Sandberg
• 金额: $ 11.9万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-01 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904905&HistoricalAwards=false
• 关键词: Sedimentology; Diagenesis; Phanerozoic; Hardgrounds

This research will gain a better understanding of the depositional setting and post-depositional alteration of hardgrounds (submarine-cemented layers exposed on the sea floor) during the Phanerozoic (the last 600 million years) and to determine the relationship of hardground properties to temporal oscillations in the physical and chemical nature of the oceans. From a large suite of Phanerozoic hardgrounds through field work and from existing collections, samples will be systematically studied using a integrated textural-isotopic-elemental approach. Standard petrographic and microanalytical methods will be augmented by the new technologies of quantitative cathode luminescence spectrometry and synchrotron radiation induced x-ray fluorescence (SRIXE). In addition to providing a new understanding of hardground sedimentology and diagenesis, the project should: 1. yield compositional criteria by which marine calcitic cements may be recognized in ancient limestones; 2. provide new insight on chemical conditions favoring cement precipitation and subsequent diagenesis; 3. advance the understanding of cathodoluminescence in carbonates, and 4. yield new information on the apparent temporal trends in ocean- atmosphere compositions and carbonate cement mineralogy. The combined methodologies to be employed should open new avenues of research in carbonate petrology and sedimentology.

这项研究将更好地了解 沉积环境和沉积后蚀变 硬地（海底水泥层暴露在海底） 在显生宙（过去6亿年）和 确定硬地特性与时间的关系 海洋物理和化学性质的波动。 通过野外工作从一个大型的古生代硬地 从现有的收集中，样本将被系统地 使用综合纹理同位素元素方法进行研究。 标准岩相学和微分析方法将 通过定量阴极的新技术增强 发光光谱和同步辐射感生X射线 荧光（SRIXE）。 除了提供新的 了解硬地沉积学和成岩作用， 项目应：1.产量组成标准， 在古石灰岩中可识别出方解石胶结物; 2. 提供有利于水泥的化学条件的新见解 降水及后续成岩作用; 3.推进 了解碳酸盐中的阴极发光，以及4.产量 关于海洋的明显时间趋势的新资料- 大气成分和碳酸盐胶结物矿物学。 的 将采用的综合方法应开辟新的途径， 碳酸盐岩岩石学和沉积学研究。