Mantle Peridotites from the Ocean Basins: Petrology and Geochemistry

该项目的主要目标是确定大西洋上地幔成分的区域变化，并根据平衡、部分熔融和初始不均匀的P-T条件对其进行解释。该研究计划包括使用发射等离子体光谱分析、XRF和中子活化的全岩分析，以及使用电子和离子探针分析常量和微量元素的矿物分析。最近从北大西洋采集的橄榄岩样品的分析工作将完善大地水准面高度和地壳深度与北大西洋橄榄岩化学的关联。了解上地幔的地球化学变化是全面了解大洋中脊玄武岩成因的基础，这些玄武岩来源于橄榄岩。该项目被认为是大洋橄榄岩地球化学研究的领先者，这一项目将对我们了解洋壳来源源岩中的化学变化做出有价值的贡献。

The principal objective of this project is to define regional variations of upper mantle composition in the Atlantic and explain them in terms of P-T conditions of equilibration, partial melting and initial heterogeneity. The research program involves both whole rock analyses using emission plasma spectrometry, XRF, and neutron activation as well as mineral analyses using electron and ion probe analyses for major and trace elements. The analytical work on peridotite samples recently acquired from the north Atlantic will refine correlations of geoid height and crustal depth with North Atlantic peridotite chemistry. %%% Understanding of upper mantle geochemical variations is fundamental to a complete understanding of petrogenesis of the midocean ridge basalts which are derived from the peridotites. The PI is recognized as a leader in the study of oceanic peridotite geochemistry, and this project will be a valuable contribution to our understanding of the chemical variation in the source rocks from which oceanic crust is derived.