外地核中U、Th的分布、核裂变及其对地球动力学的影响

Distribution of U and Th and Their Nuclear Fission in the Outer Core of the Earth and Their effects on the Geodynamics

笔者认为地球的外地核中存在大量的生热元素U和Th,它们正是驱动地球内部物质运动、包括板块运动的主要动力。按照地震波资料,地球内部最热的地区在太平洋中部,地磁资料表明地磁中心及相应的热对流中心也向太平洋板块偏离400km,因此U、Th更多地富集在太平洋之下的外地核中。前寒武纪天然核反应堆的发现及行星质量与光度的研究显示,外地核中的U、Th存在周期性核裂变,太平洋热点火山岩及其包体中富集与U、Th核裂变或衰变有密切成因联系的惰性气体也说明了这一点。外地核中的U、Th存在周期性的核裂变可能是地质历史中超静磁带形成的主要原因,也可能是地球上火山活动等地质作用存在节律性及地球膨胀的原因。

The writer considers that there is a large amount of U and Th in the outer core of the Earth. It is these U and Th that provide the energy to drive the movement of materials inside the Earth (especially the movement of the plate tectonic systems). According to the seismic wave data from the upper mantle to lower mantle , the hottest region inside the Earth lies under the center of the Pacific Ocean. Moreover, the center of the geomagnetic field departs from the center of the Earth at towards the Pacific plate for 400 km, which shows that the center of geodynamic and correspondingly the center of thermal convection are also closer to the Pacific plate for 400 km. Therefore, U and Th are richer in the outer core beneath the Pacific plate. The discovery of natural nuclear reactor in the Precambrian rocks and the research results of the relationship between the mass and luminosity of the planets show that nuclear fission can also occur in the outer core of the Earth. The fact that the rocks and xenoliths discovered in the hot plumes in the Pacific Ocean has the highest content of noble gases in the Earth, such as ~3He, ^(129)Xe, ^(136)Xe and ^(86)Kr, which are connected closely with the nuclear fission of U and Th in origination , also supports this point of view. When nuclear fission occurs, the great heat produced from that will boil the outer core and melt the inner core, which will weaken the geomagnetic field and stop its reversal, namely the geomagnetic standstill stages. This great heat will also cause the possible Earth expansion.