gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-4-0313gtcrust-466Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSКОРА И МАНТИЯ БАЙКАЛЬСКОЙ РИФТОВОЙ ЗОНЫ ПО ДАННЫМ ПРИЕМНЫХ ФУНКЦИЙ ПРОДОЛЬНЫХ И ПОПЕРЕЧНЫХ ВОЛНCRUST AND MANTLE OF THE BAIKAL RIFT ZONE FROM P- AND S-WAVE RECEIVER FUNCTIONSВинникЛ. П.VinnikL. P.

Винник Лев Павлович, докт. физ.-мат. наук, г.н.с. 

123242, ГСП-5, Москва Д-242, ул. Большая Грузинская, 10

Vinnik, Lev P., Doctor of Physics and Mathematics, Chief Researcher 

10 Bol’shaya Gruzinskaya street, Moscow D-242 123242, GSP-5, Russia

vinnik@ifz.ruОрешинС. И.OreshinS. I.

Орешин Сергей Иванович, канд. физ.-мат. наук, в.н.с. 

123242, ГСП-5, Москва Д-242, ул. Большая Грузинская, 10

Oreshin, Sergei I., Candidate of Physics and Mathematics, Lead Researcher 

10 Bol’shaya Gruzinskaya street, Moscow D-242 123242, GSP-5, Russia

sergeyi.oreshin@gmail.comЦыдыповаЛ. Р.TsydypovaL. R.

Цыдыпова Лариса Ринчиновна, канд. геол.-мин. наук, н.с. 

670047, Улан-Удэ, ул. Сахьяновой, 6а

Tsydуpova, Larisa R., Candidate of Geology and Mineralogy, Researcher 

6a Sakhyanova street, Ulan-Ude 670047, Russia

laraMGU@yandex.ruМордвиноваВ. В.MordvinovaV. V.

Мордвинова Валентина Владимировна, докт. геол.-мин. наук, в.н.с. 

664033, Иркутск, ул. Лермонтова, 128,

Mordvinova, Valentina V., Doctor of Geology and Mineralogy, Lead Researcher 

128 Lermontov street, Irkutsk 664033, Russia

mordv@crust.irk.ruКобелевМ. М.KobelevM. M.

Кобелев Михаил Михайлович, ведущий инженер, аспирант 

664033, Иркутск, ул. Лермонтова, 128

Kobelev, Mikhail M., Engineer, Postgraduate Student 

128 Lermontov street, Irkutsk 664033, Russia

kobelevmm@gmail.comХритоваМ. А.KhritovaM. A.

Хритова Мария Анатольевна, ведущий программист 

664033, Иркутск, ул. Лермонтова, 128

Khritova, Maria A., Lead Programmer 

128 Lermontov street, Irkutsk 664033, Russia

hritova@crust.irk.ruТубановЦ. А.TubanovTs. A.

Тубанов Цырен Алексеевич, канд. геол.-мин. наук, зав. лабораторией 

670047, Улан-Удэ, ул. Сахьяновой, 6

Tubanov, Tsyren A., Candidate of Geology and Mineralogy, Head of Laboratory 

6a Sakhyanova street, Ulan-Ude 670047, Russia

geos@gin.bscnet.ruИнститут физики Земли им. О.Ю. Шмидта РАНРоссияO.Yu. Schmidt Institute of Physics of the Earth of RASRussian FederationГеологический институт СO РАНРоссияGeological Institute, Siberian Branch of RASRussian FederationИнститут земной коры СO РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian FederationБайкальский филиал Федерального исследовательского центра «Единая геофизическая служба РАН»РоссияBaikal Branch of Federal Research Center ‘Geophysical Survey of RAS’Russian Federation20171812201784695709Copyright © Винник Л.П., Орешин С.И., Цыдыпова Л.Р., Мордвинова В.В., Кобелев М.М., Хритова М.А., Тубанов Ц.А., 20172017Винник Л.П., Орешин С.И., Цыдыпова Л.Р., Мордвинова В.В., Кобелев М.М., Хритова М.А., Тубанов Ц.А.Vinnik L.P., Oreshin S.I., Tsydypova L.R., Mordvinova V.V., Kobelev M.M., Khritova M.A., Tubanov T.A.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/466

Для десяти широкополосных сейсмических станций в Байкальской рифтовой зоне получены приемные функции продольных и поперечных волн и выполнено их совместное обращение в скоростные разрезы. Самая тонкая кора (30–35 км) приурочена к Байкальской впадине, самая толстая – к Восточному Саяну (45–50 км). Промежуточные значения (около 40 км) получены в БРЗ на удалениях около 100 км от Байкала. В средней и нижней коре систематически наблюдается высокое (не менее 1.8) отношение скоростей Vp/Vs, которое на нескольких станциях превышает 2.0. Самые высокие значения мы объясняем присутствием флюида с высоким поровым давлением. Сейсмическая граница литосфера – астеносфера проявляется падением скорости поперечных волн с глубиной от 4.5 до 4.0–4.2 км/с. Под Байкальской впадиной эта граница находится на глубинах, не превышающих 50 км, и понижение скорости поперечных волн в астеносфере достигает максимальных значений (около 10 %). За пределами Байкальской впадины сходная структура наблю­дается под частью Восточного Саяна. В остальных случаях характерное значение глубины границы лито­сфера – астеносфера составляет 80–90 км. Повышение температуры в гипотетическом мантийном плюме под БРЗ по изменению глубины 410-километровой сейсмической границы не обнаружено.

We have obtained P-wave and S-wave receiver functions for 10 broadband seismograph stations in the Baikal rift zone (BRZ) and inverted them for seismic velocity models of the crust and upper mantle. The thinnest crust (30–35 km) is found in the Baikal basin, the thickest in the East Sayan uplift (45–50 km). Intermediate values (40 km) are found in the BRZ at distances around 100 km from Lake Baikal. A high (at least 1.8) Vp/Vs ratio is observed in the middle and lower crust. It exceeds 2.0 at some stations. In our opinion, the highest Vp/Vs ratios are due to fluid-filled porosity with a high pore pressure. The seismic lithosphere – asthenosphere boundary (LAB) is manifested by a shear velocity drop from 4.5 km/s to 4.0–4.2 km/s. Beneath the Baikal basin, the LAB is located at a depth not more than 50 km, and the S velocity drop is maximal (10 %). A similar structure is found outside the basin, underneath a segment of the East Sayan uplift. At other locations in the BRZ, a typical depth of the LAB varies from 80 to 90 km. Having considered changes in the depth of the 410 km seismic discontinuity, we cannot find any evidence of an elevated temperature of a hypothetical thermal plume beneath the BRZ.

 

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