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

大西洋中脊岩石圈形成过程的时间变化

• 批准号: 9911753
• 负责人: Enrico Bonatti
• 金额: $ 19.99万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911753&HistoricalAwards=false
• 关键词: Temporal; Variations; Processes; Lithosphere; Formation

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.

在大西洋中部的Vema断裂带附近，沿着沿着的海底扩张流线，一个相对不受影响的弯曲和隆起的岩石圈长条连续暴露了约300 km。 该岩石圈银暴露了基底地幔橄榄岩单元、下地壳辉长岩单元、岩墙杂岩和上地壳玄武岩，是研究增生过程时间变化的理想场所。 PI已经在大约40个近距离水平间隔处对幔源超镁铁岩单元进行了采样，覆盖了超过10百万年的时间。 本项目将研究这些样品的质地、模态组成以及主量和微量元素组成。