堆积的地球及其初始不均一性

doi:10.11867/j.issn.1001-8166.1994.03.0001

地球科学进展 ›› 1994, Vol. 9 ›› Issue (3): 1 -5. doi: 10.11867/j.issn.1001-8166.1994.03.0001

干旱气候变化与可持续发展下一篇

堆积的地球及其初始不均一性

欧阳自远,王世杰,张福勤

中国科学院地球化学研究所贵阳 550002

收稿日期:1993-07-17 出版日期:1994-05-01
通讯作者: 欧阳自远

ACCUMULATED EARTH AND ITS INITIAL INHOMOGENEITY

Ouyang Ziyuan,Wang Shijie,Zhang Fuqing

Cosmochemistry groups, Institute of Geochemistry, Academy of China, Guiyang 550002

Received:1993-07-17 Online:1994-05-01 Published:1994-05-01

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从天体化学和地球科学的研究成果出发，认为地球是在一较窄的类地行星区域内，主要由硅酸盐质星子随机吸积而成。在星子形成之前，初始太阳星云已经历了挥发性元素的强烈亏损事件，同时也已发生了硫化物、金属和硅酸盐成分之间的分馏作用，随着行星的形成，行星内部的分馏作用将会持续进行。在形成地球的独立吸积区内，混合作用不彻底，星子群之间的化学成分不均一，因此，构成地球的将是一套具有各自独立化学成分组成的星子群，而不同于地球上现已发现的任何陨石或者它们的组合。

关键词: 星子, 吸积作用, 地球的形成, 不均一性

Based on the study result of cosmochemistry and Earth sciences, authors consider that Earth is accreted, in the narrow feeding zones of inner nebula, from silicate planetesimals by stochastic accretion processes. Before planetesimals formed, the early nebula had undergone vielent depletion of volatile elements, meanwhile, the fractionation of metal, sulfides and silicates had occurred also and fractionation was reinforced along with the processes of the formation of planets. In the Earth’s distinct accretion zones, mixing in the nebula is not complete and the chemical compositions among planetesimal groups is not homogenized, thus, the Earth was formed by a suit of Planetesimals which had independent chemical composition significance and were different from the meteorites o rtheir combinations found in the Earth until now.

Key words: Planetesimals, Accretion, Formation of the Earth, Inhomogeneity.

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