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

1989年，PI和学生对布罗塞维尔海岸演替中最底部的火山进行了详细的测绘和采样。这些材料，加上哥本哈根大学和格陵兰地质调查局收集的样本，为这些详细的地球化学和实验研究提供了框架。计划对整个岩石样品进行主要元素和微量元素分析，对矿物相进行微探针研究，并对选定的整个岩石和辉石分离物进行Sr、Nd和Pb同位素分析，以确定大陆裂谷向海洋扩张过渡期间岩浆组成的时间变化。提出了补充实验，以表征地幔热橄榄岩“湿”熔融的成分关系，并确定布罗塞维尔海岸玄武岩母岩浆的液态下降线。这些地球化学和实验结果将成为模拟东格陵兰玄武岩岩石成因和评价北大西洋早期裂陷的拟议物理模型的基础。

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.