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

该研究项目将研究格陵兰东部中部Kap Gustav Holm、Imilik、Kialineq和Nualik地区55 Ma至35 Ma层向深部岩浆复合体的热液年代学。目的是确定始新世陨石水稳定同位素组成的时间变化，这些变化是由冰岛地幔柱的形成和格陵兰与欧亚大陆之间的地壳裂陷引起的气候和地理变化引起的。在丹麦岩石圈中心的支持下，这项研究的样品已于1994年夏天从卡普古斯塔夫霍尔姆杂岩收集，并将于1995年夏天从其余的深凹中心收集样品。该研究基于深凹中心角闪石和k -云母的放射性（40Ar/39Ar）年龄和氧、氢同位素组成的测定。实验室研究将首先关注热液矿物的相关系、组成和共生，并将在大约1.5年内完成。项目的其余部分将包括对数据的综合和分析，以及对我们在气候变化方面的发现进行评估，这些变化伴随着北大西洋盆地和门户的古地理演化。

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.