Nature: volatilization of lava creates special chemical composition of the earth

The earth is the cradle of human beings, full of infinite mysteries, and the pace of human exploration of the earth has never stopped Recently, several research papers on Planetary Science published by geochemists in the British journal Nature Science show that the special chemical composition of the earth may be derived from the volatilization of the lava of the star This particular conclusion is a mystery to explain the formation of rocky planets such as the earth Generally known as micro planets, astrons are solids that exist in protoplanetary and debris disks The solar nebula, which is composed of condensed dust and gas, concentrates the dust into a thin cloud disk on the equatorial plane of the sun through the interaction of gas dynamics The cloud disk is unstable in gravity, collapses and ruptures, and many dust clusters with different chemical compositions are accumulated in different regions of the cloud disk These clusters are gravitationally colliding to form precursor small bodies with small diameters and different chemical compositions, called astrons Planets and satellites in the solar system are surface impact craters, which can directly prove the existence of stars in the early stage of solar system formation About 4.6 billion years ago, at the beginning of the formation of the solar system, the chemical composition of globular meteorites remained unchanged, so globular meteorites represent the original conditions in the solar system The chemical composition of rocky planets such as earth is different from that of globular meteorites Although some scientists have explained the difference, there is no detailed explanation for all the differences between them Astrophysicists believe that the melting of rocks from growing stars and the volatilization of lava from growing stars can partially supplement people's understanding of this problem The University of Bristol research team found that some elements play a role in the dissipation process, which may promote the melting and volatilization of growing celestial bodies Researchers at Oxford University in the UK agree with this view, that some specific elements on the earth "escape" in the process of lava volatilization, which may be due to the evaporation of the earth's precursor lava Through simulation experiments, the researchers melted rocks in a furnace and reconstructed the formation process of the earth The experimental results show that some elements will "escape" in the process of volatilization, and the proportion of "escape" is consistent with what we observed inside the earth Isotopic composition and standard dsm-3 of magnesium, There is a relative deviation between δ 25 / 24 mg dsm-3 The dotted line represents the earth, while the solid line represents the globular meteorite (source: nature) In another independent study, the collision process between micro planets can explain the difference of magnesium homomorph observed in different types of celestial bodies (such as earth and globular meteorite), and also the difference between different planetary formation modes These new understandings also promote the development of deep understanding of specific elements in the earth's environment Both teams believe that the collision between micro planets may promote the melting and volatilization of growing celestial bodies According to Edward young of UCLA, understanding the physicochemical properties of melt volatilization is helpful to solve the contradiction between planetary formation patterns Although these studies are not the first to propose the impact of collision on the dissipation of some elements, the research results can promote the further study of how collision shapes the special chemical composition of planets, and further promote the development of geochemistry Thesis link: https://