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

9804677鲁尼克这个项目研究了捕虏体榴辉岩的起源及其在太古宙大陆形成中的作用。这项工作是与S.Haggerty教授(马萨诸塞州大学)，J.山谷(大学)合作进行的。R.Carlson(DTM)和H.Rollinson(切尔滕纳姆)，并将重点研究西非太古宙曼盾的榴辉岩和英云闪长岩-奥长花岗闪长岩(TTGs)。利用激光消融痕量元素数据、稳定同位素数据以及Re-Os和U-Pb锆石年代学，1)验证地幔根部榴辉岩与上覆地壳太古宙TTGs之间的假设联系；2)建立一个综合的化学和同位素数据库，用以评价捕虏期榴辉岩的成因；3)评价地幔交代作用在榴辉岩成分形成中的重要性；4)更好地约束太古代大陆的生长和演化过程。

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.