Characterization of Herringbone Calcite from an Eocene Carbonate Platform, Egypt

埃及始新世碳酸盐台地人字形方解石的表征

• 批准号: 9972994
• 负责人: Dawn Sumner
• 金额: $ 11万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9972994&HistoricalAwards=false
• 关键词: Characterization; Herringbone; Calcite; Eocene; Carbonate

9972994Sumner Herringbone calcite, a distinctive calcite cement with macroscopic banding and specific crystallographic properties, may derive its distinctive morphology from the presence of Fe2+ or Mn2+ in the precipitating solution. Extremely well preserved herringbone calcite present in fissures and caves in a Middle Eocene carbonate platform, Egypt, will provide the opportunity to test previously proposed models for herringbone calcite precipitation based on Archean marine occurrences. If the conditions promoting herringbone calcite precipitation can be constrained, a better understanding of ancient ocean chemistry can be developed, and results will lead to insights into the fundamental processes controlling calcite crystal morphology. Thus, the research objectives for this project are to morphologically and geochemically characterize the Egyptian herringbonecalcite, and to use the results to constrain conditions promoting development of the herringbone calcite crystal texture.

9972994 Sumner人字形方解石是一种独特的方解石胶结物，具有宏观条带和特定的晶体学性质，其独特的形态可能源于沉淀溶液中存在的Fe 2+或Mn 2+。 保存完好的人字形方解石目前在裂缝和洞穴中始新世中碳酸盐台地，埃及，将提供机会来测试以前提出的人字形方解石沉淀模型的基础上太古代海洋事件。 如果促进人字形方解石沉淀的条件可以限制，可以开发一个更好的了解古代海洋化学，结果将导致对控制方解石晶体形态的基本过程的见解。 因此，本项目的研究目标是从形态学和地球化学方面表征埃及人字形方解石，并利用这些结果来约束促进人字形方解石晶体结构发展的条件。