Temporal evolution of sulfur content and sulfur isotopes with respect to variation of fluid composition and basalt geochemistry in the lava sequence recovered by the Kahi Puka-2 drilling (Hawaii Scientific Drilling Project)

本项目的目的是研究洋岛玄武岩和地幔捕虏体中硫的含量和同位素组成，以限制岩浆作用对熔体形成、岩浆上升和喷发过程中同位素分馏的影响。现今收集到的许多信息，在地幔的S同位素组成方面是矛盾的，表明地幔在区域上是均匀的，但作为一个整体是不均匀的。在夏威夷科学钻探计划，一个独特的机会，调查的时间变化的S含量和同位素比值的海洋岛屿玄武岩的流体成分和玄武岩地球化学，通过系统的调查，3.1公里的核心，通过在钻探过程中回收的东侧的莫纳克亚火山在希洛湾，夏威夷。岩芯代表了约100万年前的火山活动，是地幔柱活动的结果。该项目的潜力是研究与岩浆地幔过程有关的硫同位素地球化学，并有助于我们了解地幔的结构和动力学。

The objective of this project is to investigate the content and isotope composition of sulfur in ocean island basalts and mantle xenoliths to constrain the influence of magmatic processes on isotope fractionation during melt formation, magma ascent and eruption. Much of the information that has been gathered today, is in terms contradictory as to the S isotopic composition of the mantle, indicating that the mantle is regionally uniform, but heterogeneous as a whole. Within the Hawaii Scientific Drilling Program, an unique opportunity is given to investigate the temporal variation in S content and isotopic ratios of ocean island basalts in relation to fluid composition and basalt geochemistry, by systematic investigation of a 3.1 km core, recovered during drilling through the eastern flank of the Mauna Kea volcano at Hilo Bay, Hawaii. The core represent ~1 Myr of volcanism as the result of mantle plume activity. The potential of this project is to investigate S isotope geochemistry in relation to magmatic mantle processes and to contribute to our understanding of structure and dynamics of the mantle.