用非传统稳定同位素探索全球大洋玄武岩、深海橄榄岩成因和地球动力学的几个重要问题

发布时间：2018-05-05 07:59

本文选题：大洋玄武岩 + 深海橄榄岩　；参考：《地球科学进展》2017年02期

【摘要】：2017年中国科学院海洋研究所"大洋岩石圈与地幔动力学实验室"建成。未来5年,该实验室在国家自然科学基金重点项目(编号:41630968)的资助下,用珍贵的太平洋、大西洋和印度洋洋中脊玄武岩(MORB)、辉长岩和深海橄榄岩(MORP)研究地球化学和地幔动力学的几个基本科学问题:1用Ti-Zr-Hf稳定同位素验证"Nb-Ta和Zr-Hf元素对质量分异的假说";2从MORB演化过程和地幔熔融过程检验目前对铁同位素分馏的基本假说,即重Fe同位素与Fe3+有亲和性,且比轻Fe同位素和Fe2+更不相容;3提出并试图检验地幔高氧逸度是板块构造的结果,即含有大量Fe3+的蛇纹石化大洋岩石圈地幔橄榄岩俯冲到深部地幔所致;4对代表性的MORB样品和中国东部新生代碱性玄武岩样品进行铀同位素研究,检验Andersen等(2015)有关地球演化过程中壳幔循环导致的内、外动力地质过程的相互关系。
[Abstract]:The Oceanographic Institute of the Chinese Academy of Sciences, 2017, built the oceanic lithosphere and Mantle Dynamics Laboratory. In the next 5 years, the laboratory studies geochemistry with the precious Pacific, the Atlantic and India mid ridge basalt (MORB), gabbro and deep-sea peridotite (MORP), supported by the National Natural Science Foundation's key project (No. 41630968). And several basic scientific problems of mantle dynamics: 1 using Ti-Zr-Hf stable isotopes to verify the "hypothesis of mass differentiation between Nb-Ta and Zr-Hf elements"; 2 the basic hypothesis of the current separation of iron isotopes from the evolution of MORB and the process of mantle melting, namely, the affinity and nature of heavy Fe isotopes and Fe3+, is more incompatible than the light Fe isotopes and Fe2+; 3 proposed It is also an attempt to test that the high oxygen fugacity of the mantle is the result of plate tectonics, that is, the mantle peridotite of the serpentine lithosphere, which contains a large amount of Fe3+, dives to the deep mantle; 4 the representative MORB samples and the Cenozoic alkaline basalt samples in eastern China are studied by uranium isotopes, and Andersen is examined (2015) about the crust in the process of earth evolution. The relationship between mantle circulation and internal and external dynamic geological processes.

【作者单位】：中国科学院海洋研究所;青岛海洋科学与技术国家实验室;Department
【基金】：国家自然科学基金重点项目“用非传统稳定同位素探索全球大洋玄武岩、深海橄榄岩成因和地球动力学的几个重要问题”(编号:41630968)资助~~
【分类号】：P588.1;P541

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