Open AccessThermal evolution of the Earth's core during its formation taking into account heat release from the short-lived radioisotopes <sup>26</sup>Al and <sup>60</sup>Fe
Author(s) -
А. Н. Антипин,
Mansur Mindubaev
Publication year - 2021
Publication title -
litosfera
Language(s) - English
Resource type - Journals
eISSN - 2500-302X
pISSN - 1681-9004
DOI - 10.24930/1681-9004-2021-21-2-256-261
Subject(s) - aluminium , thermal , core (optical fiber) , chondrite , dynamo , earth (classical element) , thermodynamics , convection , inner core , chemistry , mineralogy , materials science , geology , physics , meteorite , metallurgy , geophysics , astrobiology , magnetic field , composite material , mathematical physics , quantum mechanics
Research subject. Based on the two-stage mechanism of the Earth's heterogeneous accumulation, previously proposed by V.N. Anfilogov and Yu.V. Khachay, the thermal evolution of the core during its formation was studied. Account is taken of both the heat release from 26 Al, the content of which was established with a fairly reliable accuracy, and that from 60 Fe. Materials and methods . The methods of mathematical modelling were used. Calculations were carried out for three estimates of the fractional content of the radioisotope 60 Fe to stable 56 Fe at the time of CAI formation (Ca-Al-In- clusions, calcium- and aluminium-rich inclusions found in carbonaceous chondrites) based on the results of various authors. Results. As a result of numerical experiments, variants of the temperature and melting temperature distributions at different stages of the core formation for different 60 Fe/ 56 Fe ratios were obtained. Conclusions. The results show that the central region of the forming core can remain melted even by the end of its accumulation. As a consequence, in this region for this time, the conditions for free thermal convection and, accordingly, for the implementation of the MHD dynamo mechanism remain.