The Role of Eclogites in the Growth of Archean Cratons: A Case Study From West Africa

榴辉岩在太古代克拉通生长中的作用：西非案例研究

• 批准号: 9804677
• 负责人: Paul Hoffman
• 金额: $ 14.6万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9804677&HistoricalAwards=false
• 关键词: Role; Eclogites; Growth; Archean; Cratons

9804677RudnickThis project addresses the origin of xenolithic eclogites and their role in the formation of Archean continents. The work is undertaken collaboratively with Prof. S. Haggerty (UMass), J. Valley (Univ. Wisconsin), R. Carlson (DTM) and H. Rollinson (Cheltenham) and will focus on eclogites and tonalite-trondhjemite-granodiorites (TTGs) from the Archean Man shield, west Africa. Laser ablation trace element data, stable isotope data and Re-Os and U-Pb zircon geochronology will be employed to 1) test the hypothetical connection between eclogites in mantle roots and Archean TTGs in the overlying crust, 2) produce a comprehensive chemical and isotopic database with which to evaluate the origin of xenolithic eclogites, 3) evaluate the importance of mantle metasomatism in producing the observed eclogite compositions and, 4) place better constraints on the processes of Archean continental growth and evolution.

9804677 Rudnick该项目致力于研究捕虏体榴辉岩的起源及其在太古代大陆形成中的作用。这项工作是与S教授合作进行的。哈格蒂（马萨诸塞大学），J谷（威斯康星州大学），R。Carlson（DTM）和H.罗林森（切尔滕纳姆），并将重点对榴辉岩和英云闪长岩-奥长花岗岩-花岗闪长岩（TTG）从太古代人盾，西非。 激光烧蚀微量元素数据、稳定同位素数据和Re-Os和U-Pb锆石年代学将用于1）检验地幔根部榴辉岩与上覆地壳中太古代TTG之间的假设联系，2）产生综合的化学和同位素数据库，以评估捕虏体榴辉岩的起源，3）评估地幔交代作用在产生所观察到的榴辉岩成分中的重要性，（4）对太古代大陆生长和演化过程有更好的制约作用。