gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2018-9-3-0378gtcrust-632Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSГЛУБОКОФОКУСНЫЕ ЗЕМЛЕТРЯСЕНИЯ: ПРОСТРАНСТВЕННОЕ РАСПРЕДЕЛЕНИЕ, ВОЗМОЖНЫЕ ПРИЧИНЫ И ГЕОДИНАМИЧЕСКИЕ СЛЕДСТВИЯDEEP-FOCUS EARTHQUAKES: SPATIAL PATTERNS, POSSIBLE CAUSES AND GEODYNAMIC CONSEQUENCESДиденкоА. Н.DidenkoA. N.

Алексей Николаевич Диденко, докт. геол.-мин. наук, член-корреспондент РАН

680000, Хабаровск, ул. Ким Ю Чена, 65; 680035, Хабаровск, ул. Тихоокеанская, 136

Aleksei N. Didenko, Doctor of Geology and Mineralogy, Corresponding Member of RAS 

65 Kim Yu Chen street, Khabarovsk 680000; 136 Tihookeanskaya street, Khabarovsk 680035

itig@itig.as.khb.ruКузьминМ. И.KuzminM. I.

Михаил Иванович Кузьмин, докт. геол.-мин. наук, академик РАН 

664033, Иркутск, ул. Фаворского, 1А,

Mikhail I. Kuz’min, Doctor of Geology and Mineralogy, Academician of RAS1A Favorsky street, Irkutsk 664033

mikuzmin@igc.irk.ruИнститут тектоники и геофизики им. Ю.А. Косыгина ДВО РАН; Тихоокеанский государственный университетРоссияYu.A. Kosygin Institute of Tectonics and Geophysics, Far East Branch of RAS; Pacific National UniversityRussian FederationИнститут геохимии им. А.П. Виноградова СО РАНРоссияA.P. Vinogradov Institute of Geochemistry, Siberian Branch of RASRussian Federation20180910201893947965Copyright © Диденко А.Н., Кузьмин М.И., 20182018Диденко А.Н., Кузьмин М.И.Didenko A.N., Kuzmin M.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/632

Пространственный анализ положения гипоцентров землетрясений в транзитной зоне верхней мантии и фокальных механизмов сильнейших из них в субдукционных слэбах охотоморского сегмента Курило-Камчатской и япономорского сегмента Японской островной дуги показал существенное различие в морфологии этих слэбов, в положении гипоцентров землетрясений относительно активной и стагнирующей части слэбов и сил, вызывающих эти землетрясения. Приведенные в работе сейсмические данные подтверждают наличие двух типов погружения океанических литосферных плит в мантию и их дальнейшую судьбу в связи с различными геологическими процессами на границе между верхней и нижней мантией. Рассмотрены возможные причины, в том числе связанные с фазовыми переходами, глубинных сейсмофокальных землетрясений, при которых происходит расщепление океанических литосферных плит на глубинах у границы верхняя – нижняя мантия. Субдукция океанических литосферных плит и их расщепление определяют возможность поступления коровых элементов в нижнюю мантию и далее в слой D″, где зарождаются новые плюмы, вызывающие поступление с глубинными магмами рециклированного вещества в коровую оболочку Земли. Глубокофокусные землетрясения являются необходимым звеном механизма рециклирования химических элементов в системе земная кора – мантия – слой D″, приводящего к появлению широкой гаммы месторождений полезных ископаемых.

The spatial analysis was conducted to analyze the positions of earthquakes hypocenters in the transit zone of the upper mantle and the focal mechanisms of the strongest earthquakes in the subduction slabs of theOkhotskSeasegment of the Kuril-Kamchatka island arc and theJapanSeasegment of the Japanese island arc. It revealed a significant difference in the morphology of these slabs, as well as in the positions of the earthquake hypocenters relative to the active and stagnating parts of the slabs and the forces that caused the earthquakes. Based on the seismic data presented in the article, it is confirmed that there are two types of subduction of the oceanic lithospheric plates in the mantle. The article discusses relationships between the subduction and various geological processes at the upper–lower mantle boundary. It considers possible causes (including those related to phase transitions) of deep-focus earthquakes, in case of which splitting of the oceanic lithospheric plates takes place at depths near the upper–lower mantle boundary. Subduction of the oceanic lithospheric plates and their splitting predetermine a possibility for the crustal elements to penetrate into the lower mantle and deeper into the D″ layer, wherein new plumes arise and transport the deep magma together with the recycled substance into the crust. Deep-focus earthquakes are a necessary link in the mechanism providing for the recycling of chemical elements in the crust – mantle – D″ layer system and thus leading to the formation of a wide range of mineral deposits.

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The authors declare that there are no conflicts of interest present.