Lithium isotope composition of rocks and minerals as tracers for metamorphic processes within the lithosphere at MAR between 14° and 16° N (ODP Leg 209)

我们建议调查的d7Li同位素系统的岩石钻探ODP腿209。该项目的重点是条件的演变...海水橄榄岩的相互作用，因为显着的变化，蛇纹化反应和强度的变化观察到的腿209样品。这些岩石提供了一个独特的机会，以获得新的见解，海洋岩石圈的变质改造，这是重要的地壳流变学和关键，了解地球化学质量循环。利用不同蛇纹化类型的锂同位素组成研究蛇纹化作用过程。碳酸盐岩脉的组成...将提供深入了解后期氧化低温蚀变过程。为了研究橄榄岩中辉长岩的高温蚀变，我们将测定角闪石的d7Li值。所有拟议的分专题都已计划好，并将与船上科学家密切合作进行调查。

We propose to investigate the d7Li isotope systematics of rocks drilled during ODP Leg 209. The project is focused on the evolution of conditions... of seawater-peridotite interactions because of the remarkable variability of serpentinization reactions and intensities of alteration observed in Leg 209 samples. These rocks provide a unique opportunity to gain new insights into the metamorphic transformation of the oceanic lithosphere, which is important for the rheology of the crust and key to understand geochemical mass cycles. The process of serpentinization will be studied using lithium isotopic composition of the different serpentinization styles. The composition of carbonate veins... will provide insights into late oxidative low temperature alteration processes. In order to study high temperature alteration of peridotite hosted gabbros we will determine d7Li values of amphiboles. All proposed subtopics are planned and will be investigated in close cooperation with scientist of the shipboard party.