Petrogenesis of Early Tertiary Rift-Related Basalts of the East Greenland Passive Margin

详细绘制和采样的最低火山岩的 由PI和学生承担了奥瑟维尔海岸的继承工作 1989年 这份材料补充了来自 哥本哈根大学和格陵兰地质调查局 收集，提供了这些详细的地球化学框架 和实验研究。 我们的计划是进行少校和追踪 全岩样品的元素分析， 矿物相组成和Sr、Nd、Pb同位素分析 整个岩石和辉石分离，建立时间变化 在大陆裂谷过渡期的岩浆成分中 到海洋扩张 建议进行补充实验， 表征“潮湿”熔融的组成关系 地幔二辉橄榄岩和定义液体下降线 是阿尔兹维尔海岸玄武岩的母岩浆。 这些地球化学 实验结果将构成模拟东 格陵兰岛玄武岩成因和评估建议 北大西洋早期裂谷作用的物理模型

Detailed mapping and sampling of the lowermost volcanics of the Blosseville Coast succession were undertaken by the PI and student in 1989. This material, supplemented by samples from the University of Copenhagen and Greenland Geological Survey collections, provides the framework for these detailed geochemical and experimental studies. The plan is to conduct major and trace element analyses of whole rock samples, microprobe studies of mineral phases, and Sr, Nd and Pb isotope analyses of selected whole rocks and pyroxene separates to establish temporal changes in magma composition during the transition from continental rifting to oceanic spreading. Complementary experiments are proposed to characterize the compositional relations for "damp" melting of mantle lherzolite and to define the liquid line-of-descent of parental magmas for Blosseville Coast basalts. These geochemical and experimental results will form the basis for modelling East Greenland basalt petrogenesis and for an evaluation of proposed physical models of early rifting in the North Atlantic.