Investigation of Comagmatic Complexes Using Isotope Systematics

这一提议要求继续提供资金， 一个正在进行的关于同源岩浆成因的研究项目 火成岩组合 本研究的主要目的是 阐明火成岩套的岩石成因， 幔源岩浆与大陆岩浆的相互作用 地壳环境 一个辅助目标是确定 岩浆源区特征和时间性质 岩浆产生事件的记录， 在地球动力学背景下对板内岩浆活动的理解。 研究的地点是新英格兰的碱性复合体， 魁北克南部和津巴布韦。 它们一般都很小， 由连续侵入体组成的浅成体， 混合物.该方法使用岩相学、主要和痕量 元素，稳定同位素和放射性同位素关系， 密切的时间控制，以制定具体的岩石成因 模型 最近的研究工作取得了宝贵的成果 关于公众开放的性质和细节的信息- 这些岩浆杂岩的系统演化和性质 岩浆活动的来源和时间 继续研究 不仅对特定的地区， 以及其他地区的类似物。

This proposal is a request for continued funding to carry out an ongoing research program on the genesis of comagmatic igneous rock associations. The primary aim of this research is to clarify the petrogenesis of igneous suites and to examine modifications of mantle-derived magmas with the continental crust environment. An auxiliary goal is to determine the character of the magma source regions and the temporal nature of the magma production events in order to advance our understanding of intraplate magmatism in a geodynamic context. The localities of study are alkaline complexes in New England, southern Quebec, and Zimbabwe. These are generally small, epizonal bodies composed of successive intrusions of varying composition. The methodology uses petrographic, major and trace element, and stable and radiogenic isotopic relationships with close temporal control to formulate specific petrogenetic models. Recent research efforts have yielded valuable information on the nature and details of the general open- system evolution of these magmatic complexes and on the nature of the sources and the timing of magmatism. Continued research should be highly rewarding not only for the specific localities and provinces under study but also for analogs elsewhere.