Joint interpretation of AMT and gravity data for clarification of Pasha-Ladoga Basin structure (NW Russia)

Переведенное название: Совместная интерпретация данных АМТ и гравиразведки для изучения Пашско-Ладожской структуры (С-З регион России)

K. Antashchuk, К. Stepanov, A. Saraev

Результат исследований: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

Аннотация

Clarification of the Pasha-Ladoga Basin structure was conducted using joint interpretation of audiomagnetotelluric (AMT) and gravity data. AMT investigations were performed along a regional profile with a length of 86 km, and three additional 10 km profiles within the south-eastern part of the basin. A four-layered geoelectrical model was obtained up to a depth of 2 km according to 2D inversion results of AMT data, and model interpretation enabled determination of the upper and lower boundaries of Riphean rocks in the Ladoga-Pasha Basin. Maximum thickness of the zone of the Riphean deposits was established at the central part of the regional profile. Joint AMT and gravity data interpretation results clarified a division of the Pasha-Ladoga Basin area and determined two fore deeps and a central linear zone with a trough structure, where the zone is characterized by a maximum thickness of Riphean deposits and corresponds to the linear positive anomaly of the gravity field in a north-western direction. Results of gravity field modeling show that this anomaly relates to heavy rocks, which are probably basalts and mafic volcanic rocks. The structure of this zone and its filling by mafic volcanic rocks can be interpreted as a rift structure, and based on gravity data the rift structure is found to extend to the Ladoga Lake area, with an observed length of about 140 km and a width of 17–25 km. The results obtained in this study allow better definition of the borders and specification of the Pasha structure’s rift origin.
Переведенное названиеСовместная интерпретация данных АМТ и гравиразведки для изучения Пашско-Ладожской структуры (С-З регион России)
Язык оригиналаанглийский
Название основной публикацииAbstracts. 24th EM Induction Workshop, Helsingør, Denmark, August 12-19, 2018
Число страниц4
СостояниеОпубликовано - авг 2018
Событие 24th EM Induction Workshop, Helsingør, Denmark, August 12-19, 2018, At Helsingør, Denmark - Helsingør, Дания
Продолжительность: 12 авг 201819 авг 2018

конференция

конференция 24th EM Induction Workshop, Helsingør, Denmark, August 12-19, 2018, At Helsingør, Denmark
СтранаДания
ГородHelsingør
Период12/08/1819/08/18

Предметные области Scopus

  • Геофизика

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