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组成的区域变化，并根据平衡、部分熔融和初始非均质性的P-T条件解释这些变化。该研究项目包括使用发射等离子体光谱法、XRF和中子活化法对整个岩石进行分析，以及使用电子和离子探针分析主要元素和微量元素的矿物分析。对最近从北大西洋获得的橄榄岩样品的分析工作将改进大地水准面高度和地壳深度与北大西洋橄榄岩化学的相关性。了解上地幔地球化学变化是全面了解源自橄榄岩的洋中脊玄武岩成因的基础。中国科学院在海洋橄榄岩地球化学研究方面处于领先地位，该项目将为我们了解形成海洋地壳的烃源岩化学变化做出重要贡献。

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.