RPG: An Investigation of the Effects of Recrystallization Processes on the Metasomatism of Mantle Peridotites

这项研究将探讨同位素的机制， 交代流体与上地幔的化学作用 集会。 南非金伯利岩捕虏体样品和 美国西南部的碱性玄武岩 为了学习 新变晶、碎斑和非重结晶 将分析REE、LILE（Ba、Sr、Rb、Na、K）和HFSE相 (Ti，Nb，Zr，Hf，Ta）的电子探针和 西姆斯法鉴别不相容微量元素的关系 地球化学重结晶 而言发生的变动 与织构变化相关的氧化态也将 研究了 同位素测量（87 Sr/86 Sr和143 Nd/144 ND） 将在分离的碎斑岩和新成斑岩上形成， 橄榄石和斜方辉石来确定是否 组成随晶粒尺寸系统地变化。 此外，本发明还提供了一种方法， 石榴石、单斜辉石的同位素测量，如果可能， 次要相（即氧化物或云母）将被确定， 总的数据集可以与石榴石和尖晶石的数据相结合 来自玄武岩的陨石 这项调查将增加 对上地幔过程的理解， 交代作用

The proposed research will investigate the mechanism of isotopic and chemical interaction between metasomatic fluid and upper mantle assemblages. Xenolith samples from South African kimberlites and alkali basalts for the southwestern United States have been chosen for study. Neoblasts, porphyroclasts, and non-recrystallized phases will be analyzed for REE, LILE (Ba, Sr, Rb, Na, K) and HFSE (Ti, Nb, Zr, Hf, Ta) by a combination of electron microprobe and SIMS to discern the relationship of incompatible trace element geochemistry to recrystallization. Possible variations in oxidation state associated with textural variations will also be investigated. Isotopic measurements (87Sr/86Sr, and 143Nd/144ND) will be made on separates of porphyrocalsts and neoblasts of olivine and orthopyroxene to determine whether isotopic compositions vary systematically with grain size. In addition, isotopic measurements for garnet, clinopyroxene, and when possible minor phases (i.e. oxides or mica) will be determined so that the total data set can be combined with data for garnet and spinel lherzolites from basalts. This investigation will add to the understanding of the upper mantle processes which result in metasomatism.