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首页> 外文期刊>Journal of China University of Geosciences >35 Ma—An Important Natural Periodicity in Geological History: Concept of Natural Crisis and Its Possible Cause
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35 Ma—An Important Natural Periodicity in Geological History: Concept of Natural Crisis and Its Possible Cause

机译：35 Ma-地质史上重要的自然周期性：自然危机的概念及其可能的成因

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摘要

Among the cyclicity shown by the geologic evolution of the earth, the periodicity of ca 35 Ma is expressed most distinctly, which is evidenced not only by global sea-level changes, biotic mass extinctions, tectonic episodes, magmatic cycles and climatic changes, but also by magnetic reversals and impact craterings. It is suggested that the periodicity of ca 35 Ma may represent a natural stage by which the earth has evolved, and can be taken as an objective criterion of determining the 2nd-order eustatic cycles and their sedimentary records—the mesosequences. Major geologic events in the earth s history are apparently clustered at some specific periods, suggesting natural crises. They are thought to have been controlled mainly by astronomic cycles, especially related to the crossing of the Solar system through the Galactic plane.
机译：在地球的地质演化所显示的周期性中，大约35 Ma的周期性表现得最为明显，这不仅通过全球海平面变化，生物灭绝，构造事件，岩浆旋回和气候变化来证明。通过磁性反转和撞击坑。有人认为，大约35 Ma的周期性可能代表地球演化的自然阶段，并且可以作为确定二阶欣喜循环及其沉积记录（中观序列）的客观标准。地球历史上的重大地质事件显然聚集在某些特定时期，表明自然危机。人们认为它们主要受到天文周期的控制，特别是与太阳系穿过银河系的穿越有关。

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