摘要
地球化学成分和其他地质现象一样，在地球发展过程中也表现出节律。文中选择大气中的ＣＯ２、海水中的δ３４Ｓ和８７Ｓｒ／８６Ｓｒ、地壳中的Ｋ／Ｎａ为代表，介绍了地球历史发展中的地球化学节律，同时还给出了区域构造演化中的地球化学演化节律的研究实例。在此基础上，对引起地球化学节律性变化的动力学机制进行了讨论，指出板块构造机制存在着时代的局限性，并提出了用“开”、“合”的思路去认识地球历史的地球化学节律性。
Like the other geological phenomena, chemical components of the Earth show also rhythmicity in the development of the Earth. In this paper, historical changes of CO 2 in the atmosphere, δ 34 S and 87 Sr/ 86 Sr in the hydrosphere and K/Na in the crust have been selected as examples to introduce the concept of geochemical rhythmicity in the development of the Earth. Besides, the research examples about chemical rhythms in the evolution of two tectonic zones, the Lajishan and the Qinling, have been provided too. In the discussion on kinetics inducing the chemical rhythms, authors point out that the rhythmicity can not be interpreted sufficiently by the theory of plate tectonics, while the thought of “opening” and “closing” may be put forward to explain it.
出处
《地学前缘》
EI
CAS
CSCD
1997年第4期191-196,共6页
Earth Science Frontiers
基金
自然科学基金
关键词
地球历史
地球化学节律
节律
geochemistry, rhythm, “opening” and “closing”
