Geochemical Evolution of the Earth

地球的地球化学演化

• 批准号: 8817082
• 负责人: George Tilton
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-15 至 1991-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817082&HistoricalAwards=false
• 关键词: Geochemical; Evolution; Earth

This is a continuing project on Pb, Sr and Nd tracer studies of carbonatites and alkaline-complex rocks as probes to study the geochemical evolution of the Earth's mantle over the past 3,000,000,000 years. They now plan to study avariety of specific rocks; calcites from Finland and Uganda, C and O in carbonatites from Uganda, O isotopes from ancient syenites, Hf from carbonatites of the Canadian Shield, and Pb, Nd, Sr, O and C isotopes on carbonatites from the Canary Islands provided by LeBas. There will also be an attempt to obtain carbonatites from India, China and Greenland. A new thrust will be a measurement of age and isotope patterns of coesite- and almandine-bearing rocks from Dora Maira, Italy. The reasearch will be done in collaboration with other workers from Germany, Canada, Italy and Switzerland.

这是一个继续进行的项目，以碳酸盐岩和碱性杂岩为探针进行铅、锶和钕示踪研究，以研究过去30亿年来地幔的地球化学演化。他们现在计划研究各种特定的岩石：来自芬兰和乌干达的方解石，来自乌干达的碳酸盐岩中的碳和氧，来自古代正长岩的氧同位素，来自加拿大地盾碳酸盐岩的Hf，以及由LeBas提供的加那利群岛碳酸盐岩的铅、钕、锶、氧和碳同位素。还将尝试从印度、中国和格陵兰获得碳酸盐岩。一个新的推动力将是测量来自意大利多拉迈拉的柯石英和铁铝榴石岩石的年龄和同位素模式。这项研究将与来自德国、加拿大、意大利和瑞士的其他工作人员合作完成。