A Possible Relationship between Deep Earthquakes and the Structural Transition of Submolecular SiO2 Fragments in Rocks of a Subducting Oceanic Slab-Reference-Cited by-同舟云学术

A Possible Relationship between Deep Earthquakes and the Structural Transition of Submolecular SiO2 Fragments in Rocks of a Subducting Oceanic Slab

Published:2019-03-01 Issue:3 Volume:60 Page:241-253
ISSN:1068-7971
Container-title:Russian Geology and Geophysics
language:en
Short-container-title:

Author:

Kuzmin M.I.¹,Khlebopros R.G.²³,Didenko A.N.⁴⁵,Kozlova S.G.⁶⁷,Zakhvataev V.E.²³

Affiliation:

1. A.P. Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, ul. Favorskogo 1A, Irkutsk, 664033, Russia

2. Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, 660036, Russia

3. Siberian Federal University, pr. Svobodnyi 78, 660041, Krasnoyarsk, Russia

4. Yu.A. Kosygin Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, ul. Kim Yu Chena 65, Khabarovsk, 680000, Russia

5. Pacific National University, ul. Tikhookeanskaya 136, Khabarovsk, 680035, Russia

6. A.V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia

7. V.G. Shukhov Belgorod State Technological University, ul. Kostyukova 46, Belgorod, 308012, Russia

Abstract

Abstract —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.

Publisher

GeoScienceWorld

Subject

Geology,Geophysics

Link

https://pubs.geoscienceworld.org/rgg/article-pdf/60/3/241/5114950/rgg_01_mar2019.pdf

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