| Autor: |
Mikhail I. Kuzmin, V. E. Zakhvataev, R. G. Khlebopros, Svetlana G. Kozlova, A. N. Didenko |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Russian Geology and Geophysics. 60:241-253 |
| ISSN: |
1068-7971 |
| DOI: |
10.15372/rgg2019038 |
| Popis: |
—Quantum-chemical calculations show a tendency of SiO2 molecule to transform from linear to isomeric cyclic (bent) form and back. In the latter case, the energy released during the transition isomeric SiO2 → linear SiO2 is about 240 kJ/mole. This hypothetic structural transition of submolecular SiO2 fragments in mantle minerals is supposed to initiate deep-focus high-energy earthquakes at the upper–lower mantle boundary. It is at this depth (600–670 km) that the subducting oceanic slab is delaminated: Its upper part moves “horizontally” along the upper–lower mantle boundary, while its lower part separated into blocks subsides into the lower mantle and reaches the Dʺ layer to accumulate there. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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