gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2018-9-4-0399gtcrust-685Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSГЕОЭЛЕКТРИЧЕСКИЙ ИМИДЖ СБРОСОВЫХ ЗОН: ТЕКТОНОФИЗИЧЕСКАЯ ИНТЕРПРЕТАЦИЯ МАЛОГЛУБИННОЙ ЭЛЕКТРОТОМОГРАФИИ НА ПРИМЕРЕ БУГУЛЬДЕЙСКО-ЧЕРНОРУДСКОГО ГРАБЕНА В ЗАПАДНОМ ПРИБАЙКАЛЬЕGEOELECTRICAL IMAGES OF NORMAL FAULT ZONES: TECTONOPHYSICAL INTERPRETATION OF THE SHALLOW-DEPTH ELECTRICAL RESISTIVITY TOMOGRAPHY DATA ON THE BUGULDEIKA-CHERNORUD GRABEN IN THE WESTERN BAIKAL REGIONhttps://orcid.org/0000-0001-7607-0417СеминскийК. Ж.SeminskyK. Zh.

Константин Жанович Семинский - доктор геолого-минералогических наук, заместитель директора.

664033, Иркутск, ул. Лермонтова, 128

Konstantin Zh. Seminsky - Doctor of Geology and Mineralogy, Deputy Director.

128 Lermontovstreet, Irkutsk 664033

seminsky@crust.irk.ruhttps://orcid.org/0000-0002-4405-6132БобровА. А.BobrovA. A.

Александр Анатольевич Бобров - кандидат геолого-миралогических наук, научный сотрудник.

664033, Иркутск, ул. Лермонтова, 128

Alexander A. Bobrov - Candidate of Geology and Mineralogy, Researcher.

128 Lermontov street, Irkutsk 664033

alexbob@crust.irk.ruИнститут земной коры СО РАН; Иркутский научный центр СО РАНРоссияInstitute of the Earth's Crust, Siberian Branch of RAS; Irkutsk Scientific Center, Siberian Branch of RASRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth's Crust, Siberian Branch of RASRussian Federation2018091220189413391361Copyright © Семинский К.Ж., Бобров А.А., 20182018Семинский К.Ж., Бобров А.А.Seminsky K.Z., Bobrov A.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/685

В статье представлены результаты применения нового подхода к обработке и интерпретации данных малоглубинной электротомографии на примере сбросовых зон центральной части Байкальского рифта. Подход основан на представлениях тектонофизики о трехстадийном формировании разлома, которое предопределяет закономерное существование в породном массиве трех уровней нарушенности субстрата. Уровни выявляются посредством статистического анализа величин удельного электрического сопротивления (УЭС), измеренных на профиле электротомографии, пересекающем изучаемый дизъюнктив. Это позволяет выделять на геоэлектрическом разрезе участки, у которых уровень нарушенности пород соответствует ранней, поздней и заключительной стадии разломообразования. Подобный разрез представляет основу для выделения границ разломной зоны и главных особенностей ее внутреннего строения. Тектонофизический подход был реализован для серии разноранговых сбросовых зон, располагающихся в бортах Бугульдейско-Чернорудского грабена в Приольхонье. Сопоставление геоэлектрических разрезов, построенных в соответствии с единой методикой, позволило установить, что приразломные аномалии УЭС в качественном отношении подобны. Их строение определяется общим механизмом сбросообразования, реализующимся в верхней части коры при скольжении вдоль изогнутого (листрического) сместителя. Итогом исследования стала идеализированная геоэлектрическая модель, которая представляет двумерный разрез с низкоомной аномалией, соответствующей сбросовой зоне. Аномалия асимметрична, имеет грибоподобный вид и неоднородное внутреннее строение. Ее структура в лежачем крыле отражает веер вторичных разломов, образующихся при субвертикальных движениях в сбросовой зоне, которая у поверхности круто наклонена к горизонту. Строение аномалии в висячем крыле отражает систему линзоподобных грабенов, формирующихся над выполаживающейся с глубиной поверхностью главного сместителя. Предложенная на примере Приольхонья геоэлектрическая модель может иметь широкое применение для диагностики обстановок и структур растяжения земной коры, поскольку ее строение контролируется общими закономерностями формирования сбросовых зон, имеющих листрическую форму.

In the study of normal fault zones located in the central Baikal rift, a new approach was applied to process and interpret the shallow-depth electrical resistivity tomography data. This approach is based on the concepts of tectonophysics and considers three-stage formation of a fault and the corresponding three degrees of rock material disturbance, which are regularly detected in the rock mass. The degrees are established by statistical analysis of specific electrical resistance (SER) measured from the electrical resistivity tomography profile across the faults under study. Based on a geoelectrical profile, it is possible to identify the sites wherein the disturbed rocks show the indicators of the early, late and final stages of faulting. The profile provides the basis for specifying the boundaries of the fault zone and the main features of its internal structure. The tectonophysical approach was applied to study a series of normal fault zones varying in ranks. The zones are located on the sides of the Buguldeika-Chernorud graben located near the Olkhon Island in the Western Baikal region. By comparing the geoelectrical profiles constructed under the same methodology, it was established that the near-fault anomalies of electrical resistance are qualitatively similar. Their structure is defined by the general mechanism of normal faulting in the upper crust during sliding along a curved (listric) fault plane. The research results are consolidated in an idealized geoelectrical model: a 2D profile showing a low-resistance anomaly that corresponds to a normal fault zone. This anomaly is asymmetrical and mushroom-shaped, and its internal structure is heterogeneous. In the lying wing of the fault, the anomaly reflects the fan-shaped set of secondary faults caused by the subvertical movements in the normal fault zone, which surface is steeply inclined to the horizon. In the hanging wing, the structure of the anomaly reflects a system of lens-like grabens that form above the surface of the main fault plane that becomes less inclined with depth. The structure of the geoelectrical model proposed for the Olkhon region follows the general regularities controlling formation of listric-shaped normal fault zones. This model can be widely used for diagnostics of tectonic settings and crustal extension structures in other regions.

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