Temporal Variations of Helium Isotopes in and at Gran Canaria, Canary Islands and Significance for Magma Dynamics

本项目旨在研究加那利群岛大加那利岛3He/4He的时间变化。本文将研究大加那利岛整个地层剖面的各种斑晶类型。结果将提供大加那利岛不同岩浆类型的约束条件。将尝试使用(U + Th)/ He对样品进行地质年代学，并与已有的Argon年龄进行比较。氦同位素对岩石圈和上地幔岩浆的来源提供了重要的约束。在大加那利岛的研究特别重要，因为目前可获得的同位素数据与与大加那利热点有关的地球物理数据不一致。

This project is for study of temporal variation of 3He/4He on Gran Canaria, Canary Islands. A variety of phenocrysts types throughout the stratigraphic section at Gran Canaria will be studied. Results will provide constraints of different magma types at Gran Canaria. Geochronology of the samples will be attempted using (U + Th)/ He and compared with Argon ages already available. %%% Helium isotopes provide an important constraint on the source of magmas generated in the lithosphere and upper mantle. The study at Gran Canaria is especially important because isotope data presently available is inconsistent with geophysical data relating to the Canary hot spot.