13亿年前叠层石的生长节律和地-日-月动力学

研究的微小型叠层石Pseudogymnosolen f．产于华北蓟县中元古代蓟县系雾迷山组，年龄近1300Ma。该种叠层石具有非常清楚的生长节律，而且由小到大至少可划分出三个的级别，即“基本层”、“基本层组”和“叠层石带”，它们分别被解释为昼夜节律、月节律和年节律。根据月节律中的昼夜节律数和年节律中的月节律数，得出的初步结论是在近1300Ma以前，古月球绕古地球旋转1周至少需要42天，古地球绕古太阳公转一周，古地球至少要自转546周，古月球绕古地球至少要旋转13周，古地球自转1周最多仅需16．05小时。

THE EARTH-SUN-MOON DYNAMICS FROM GROWTH RHYTHMS OF 1300MA STROMATOLITES

The mini-stromatolites Pseudogymnosolen f. occur in the Mesoproterozoic Wumishan Formation in the Jixian area, North China, with an age of approximately 1 300Ma. This kind of stromatolites possesses very clear growth rhythm, which can be subdivided at least into three ranks, i. e. "basic laminae","laminar groups"and"stromatolite bands"in ascending order, which are interpreted as the daily, monthly and yearly rhythms respectively.On the basis of the number of daily rhythms per month and the number of the monthly rhythms per year, the authors have drawn the preliminary conclusions that it needed at least 42 palaeo-days the palaeo-Luna to comptlete a circle around the palaeo-earth a turn, the earth rotated at least 546 turns and the Luna did around the earth at least 13 turns when the palaeo-earth revolved around the palaeo-sun a turn. In addition, it only needed at most 16.05hours for the palaeo-earth to complete one self-rotation.