gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-6-0726gtcrust-1756Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSГЕОДИНАМИКА ЗОН СОЧЛЕНЕНИЯ СПРЕДИНГОВЫХ ХРЕБТОВ РЕЙКЬЯНЕС И КОЛБЕНСЕЙ С РИФТОВЫМИ ЗОНАМИ ИСЛАНДИИGEODYNAMICS OF JOINT ZONES OF REYKJANES AND KOLBEINSEY SPREADING RIDGES WITH ICELAND RIFT ZONESБоголюбскийВ. А.BogoliubskiiV. A.

119991, Москва, Ленинские горы, 1

1 Leninskie Gory, Moscow 119991

ДубининЕ. П.DubininE. P.

119991, Москва, Ленинские горы, 1

1 Leninskie Gory, Moscow 119991

Московский государственный университет им. М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian Federation202314122023146726726Copyright © Боголюбский В.А., Дубинин Е.П., 20232023Боголюбский В.А., Дубинин Е.П.Bogoliubskii V.A., Dubinin E.P.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/1756

Зоны сочленения спрединговых хребтов Рейкьянес и Колбенсей с рифтами Исландской крупной магматической провинции имеют ряд существенных отличий в структуре от прилегающих спрединговых сегментов, несмотря на схожую кинематику. Трансформная зона Тьёрнес является сложноустроенной и включает в себя ряд вулканических и амагматических структур. Рейкьянесская рифтовая зона, напротив, отличается относительно простым строением при однородном, в целом, характере тектонической и магматической активности. Причины различий в строении трансформных зон и их современная динамика остаются не до конца объясненными. На основе методики анализа морфометрических показателей сбросовых уступов было установлено, что столь значительные различия трансформных зон обусловлены пространственно-временной стабильностью прилегающих к ним структур, в свою очередь контролируемой периодическим увеличением магматической активности Исландского плюма. Развитие рифтогенных структур в пределах трансформных зон находится в прямой связи с их расположением относительно прилегающих спрединговых сегментов и с их магматическим состоянием. Современное развитие обеих трансформных зон связано с нестабильностью и миграцией рифтовых зон Исландии под действием термических импульсов Исландского плюма и, как следствие, кинематической перестройкой самих трансформных зон. Для трансформной зоны Тьёрнес это выражается в постепенном упрощении ее структуры: отмирании западной ветви и прекращении активности блоковых структур. Для Рейкьянесской рифтовой зоны наблюдается постепенное смещение оси в южном направлении, с чем также связывается наличие интенсивного вулканизма в ее пределах.

Joint zones of Reykjanes and Kolbeinsey spreading ridges with Iceland large igneous province considerably differ in structure from adjacent spreading segments despite of similar kinematics. Tjörnes transform zone is a complicated system. It comprises several volcanic and amagmatic structures. In contrast, Reykjanes rift zone has relatively simple structure and homogeneous type of tectonic and magmatic activity. The causes of those differences and their modern dynamics are not fully explained hitherto. Basing on morphometric analysis of normal fault scarps parameters it was concluded that such significant differences of transform zones are result of spatial and temporal stability of adjacent structures. In turn, the latter is controlled by periodic increase of Iceland plume magmatic activity. Rift structures development within transform zones directly correlates with their position over adjacent spreading segments and their magmatic conditions. Modern development of both transform zones is caused by Iceland rift zones instability and migration impacted by Iceland plume thermal pulses. Consequently, transform zones undergo kinematic changes. For Tjörnes transform zone it is expressed in its structure gradual simplification: the western branch and block structures cease their activity. In Reykjanes rift zone rift axis gradually migrates southwards that probably results in its intensive volcanism.

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