Lunar nodal tide and distance to the Moon during the Precambrian
Lunar nodal tide and distance to the Moon during the Precambrian
复制标题
前寒武纪月交点潮汐和距月球的距离
作者：
James C. G. Walker;K. Zahnle
过去~ 450 Myr的潮汐演化速度意味着大约1500 - 2000 Myr BP的地球/月球碰撞（见参考文献1），这一事件没有确凿的证据。在这里，我们提出了前寒武纪月球距离的第一个直接测定。我们认为，在2500 Myr BP的澳大利亚带状铁地层（BIF）2中保存的23.3±0.3年的周期反映了月球交点潮的气候影响，而在一些现代气候记录中已检测到其现代18.6年的周期3- 10。那时，2,500 Myr BP的月球距离大约是地球半径的52倍。前寒武纪潮汐摩擦的隐含历史与最近的古生物学证据和月球轨道的长期稳定性一致。调节今天冰河时代的米兰科维奇周期的长度也随着地月系统的变化而变化。它们在前寒武纪沉积记录中的发现，将允许对月球距离的独立测定。
The pace of tidal evolution for the past ∼450 Myr implies an Earth/Moon collision some 1,500–2,000 Myr BP (see ref. 1), an event for which there is no corroborating evidence. Here we present the first direct determination of the lunar distance in the Precambrian. We interpret a 23.3±0.3-yr periodicity preserved in a 2,500 Myr BP Australian banded iron formation (BIF)2 as reflecting the climatic influence of the lunar nodal tide, which has been detected with its modern 18.6-yr periodicity in some modern climate records3–10. The lunar distance at 2,500 Myr BP would then have been about 52 Earth radii. The implied history of Precambrian tidal friction is in accord with both the more recent palaeontological evidence and the long-term stability of the lunar orbit. The length of the Milankovitch cycles that modulate the ice ages today11–13 also evolve with the Earth–Moon system. Their detection in the Precambrian sedimentary record would then permit an independent determination of the lunar distance.