Xenoliths of the Earth’s core in Siberian traps
The analysis of data on hot heterogeneous accretion of the Earth indicates that the accretion of the mantle at the bottom of the magmatic ocean during the fall of large planetesimals produced impact depressions. Compression crystallization of the magmatic ocean bottom basic melts that filled them up produced eclogite bodies in the mantle. Xenoliths of the core got into impact hollows and eclogites they formed in the parts of the mantle bordering the core. Surfacing and decompressive melting of eclogites produced trap bodies that sometimes contain native iron bodies. The tremendous impact force mainly generated large masses (up to tens of tons) of resulting xenoliths and bodies of native iron in the traps. Iron meteorites show signs of formation in result of the nuclei destruction in small planets. The close origin explains the great similarity of the composition of native iron in traps and iron meteorites. Formation from the outermost later parts of the Earth’s core, arising from the lower-temperature condensates of the protoplanetary disk, is responsible for the higher iron content of traps compared to meteorites of low-temperature condensates and lower high-temperature condensates. Decompressive solidification of basic magmas after boiling at the near-surface surfacing stage explains the non-sedimentation of high-density iron bodies, their confinement to decompressively solidified upper parts of dolerite intrusions and their absence in the Earth surface basalts, where this solidification did not occur.