Interaction Between the Iceland Mantle-Plume and the Hydrosphere: Tectonic and Climatic Effects on Hydrothermal Solutions

9506469伯德该研究计划将调查位于格陵兰岛中部的Kap Gustav Holm、Imilik、Kialineq和Nualik的55 Ma至35 Ma浅层深成杂岩的热液年代学。目的是确定始新世陨石水稳定同位素组成的时间变化，这些变化是由于与冰岛地幔热柱的形成和格陵兰与欧亚大陆之间的地壳裂谷有关的气候和地理变化造成的。在丹麦岩石圈中心的支持下，这项研究的样品于1994年夏天从Kap Gustav Holm杂岩中收集，其馀的深成岩中心的样品将在1995年夏天收集。这项研究是基于对深成岩中心角闪石和钾云母的放射性(40Ar/39Ar)年龄和氧、氢同位素组成的测定。实验室研究最初将集中在热液矿物的相关系、组成和共生方面，并将在大约1.5年内完成。该项目的其余部分将涉及数据的综合和分析，以及对我们在伴随北大西洋盆地和门户古地理演变而产生的气候变化方面的研究结果进行评估。

9506469 Bird The research program will investigate hydrothermal chronology of the 55 Ma to 35 Ma epizonal plutonic complexes at Kap Gustav Holm, Imilik, Kialineq, and Nualik in central East Greenland. The objective is to determine temporal variations in the stable isotope composition of Eocene meteoritic water caused by climatic and geographic changes related to initiation of the Iceland mantle plume and crustal rifting between Greenland and Eurasia. With support from the Danish Lithosphere Center samples for this study were collected from the Kap Gustav Holm complex in the summer of 1994 and samples from the remaining plutonic centers will be collected during the summer of 1995. The research is based on determinations of radiometric (40Ar/39Ar) ages and oxygen and hydrogen isotope compositions of amphiboles and K-micas from the plutonic centers. Laboratory studies will initially focus on phase relations, compositions, and parageneses of hydrothermal minerals and will be completed in approximately 1.5 years. The remainder of the project will involve synthesis and analysis of the data, and evaluation of our findings in terms of climate changes that accompanied the paleogeographic evolution of the North Atlantic Ocean basins and gateways.