An approach to the geologic history of the Earth’s mantle geospheres |
| |
| Authors: | Yu M Pushcharovsky D Yu Pushcharovsky |
| |
| Institution: | (1) Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;(2) Faculty of Geology, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
| |
| Abstract: | The geospheres that make up the Earth’s mantle, i.e., the upper, middle, and lower mantle, as well as dividing zones of discontinuity, are autonomous geological bodies whose geologic history is poorly known. The data on evolution of planetary magmatism and mineral transformations along the Earth’s radius, thermobaric information on the Earth’s interior, and new geodynamic reconstructions are used to outline the geologic history of deep geospheres. In broad terms, we suggest that layer D″, the lower mantle, and the Eoarchean basic protocrust were the first to be formed after differentiation of the protoplanetary material. The sialic crust appeared in the Paleoarchean. The system that comprised layer D″ the lower mantle, and discontinuity II was formed later, ～2.6 Ga ago, while the upper mantle and discontinuity I originated ca. 1.6–1.7 Ga ago. Thus, the within-mantle geospheres were formed in their present-day appearance over a long period of time. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
