Temporal Variations in Processes of Lithosphere Formation at the Mid Atlantic Ridge

一条相对未受干扰的弯曲和隆起的岩石圈沿着大西洋中部Vema断裂带附近的海底扩张流线连续暴露了约300公里。该岩石圈银条暴露出基幔橄榄岩单元、下地壳辉长岩单元、脉杂岩和上地壳岩盐，是研究吸积过程时间变化的理想场所。PI在大约40个紧密间隔的水平间隔内对地幔衍生的超镁基单元进行了采样，采样时间超过10分钟。本项目将研究这些样品的织构、模态组成以及主要元素和微量元素组成。

A relatively undistured sliver of flexured and uplifted lithosphere is exposed continuously for about 300 km along a seafloor spreading flow line near the Vema Fracture Zone in the central Atlantic Ocean. This lithospheric sliver exposes a basal mantle peridotite unit, a lower crustal gabbro unit, a dike complex, and upper crustal asalts, and is an ideal location for studying temporal changes of accretion processes. The PI has sampled the mantle-derived ultramafic unit at about 40 close-spaced horizontal intervals covering a strectch of time of over 10 my. This project will study texture, modal composition and major and trace element composition of these samples.