litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2023-23-6-1027-1037litosphere-1985Research ArticleСтатьиArticlesПриповерхностная характеристика базальтов провинции Сукадана на основе гравитационного метода (Лампунг, Индонезия)Subsurface delineation of Sukadana Basalt Province based on gravity method, Lampung, IndonesiaСирингорингоЛ. П.SiringoringoL. P.

40132, Бандунг; 35365, Южный Лампунг

Bandung 40132;South Lampung 35365

luhut_pardamean@yahoo.co.idСапийеБ.SapiieB.

40132, Бандунг

Bandung 40132

РудьяванА.RudyawanA.

40132, Бандунг

Bandung 40132

СусиптаИ. Г. Б. Е.SuciptaI.G.B.E.

40132, Бандунг

Bandung 40132

Бандунгский технологический институт; Суматринский технологический институтИндонезияBandung Institute of Technology; Sumatra Institute of TechnologyIndonesiaБандунгский технологический институтИндонезияBandung Institute of TechnologyIndonesia20232912202323610271037Copyright © Сирингоринго Л.П., Сапийе Б., Рудьяван А., Сусипта И., 20242024Сирингоринго Л.П., Сапийе Б., Рудьяван А., Сусипта И.Siringoringo L.P., Sapiie B., Rudyawan A., Sucipta 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.lithosphere.ru/jour/article/view/1985

Объект исследований. Геологический профиль базальтовой провинции Сукадана на тыловой дуге у края о-ва Суматра привлекает внимание исследователей неясным положением геологических структур и их взаимоотношением с региональной геологией Сундаленд. Цель работы. Выяснение типа и характера геологических структур, контролирующих базальтовую провинцию Сукодана (SBP) на поверхности, распределение базальта Сукадана в недрах и его связь с региональной тектоникой Сундаленда. Материалы и методы. Была проведена вторичная обработка карты аномалий Буге (1991) на территории квадрата Тан-юнгкаранг. Результаты. В ходе работы было обнаружено, что главное извержение располагалось в центре (SBP). Данные последующего моделирования показали, что мощность (SBP) достигает 3200 м. Установлено, что развитие (SBP) контролировалось двумя нормальными разломами СЗ-ЮВ простирания и одной трещинной структурой. Эти разрывы служили первичными каналами магмы, поднимающейся от мантии к земной поверхности. Был также выявлен нормальный разлом меридионального простирания и широтный правосторонний сдвиг, которые образовали ранне-олигоценовую дополнительную подвижку магмы к поверхности. Заключение. Нормальные меридиональные разломы коррелировали с ороклинальным изломом Сундаленда. Эти разломы развивались в пределах широкой раздвиговой площади, что способствовало утонению континентальной литосферы. Между тем, четвертичные СЗ-ЮВ трещины коррелируют с развитием Большого разлома Суматры. При его исследовании обращают на себя внимание две ключевые точки: образование СЗ-ЮВ трещин было вызвано движением Большого разлома Суматры, а утоньшение островодужной части коры происходило благодаря многочисленным структурам растяжения, которые способствовали подъему к поверхности (SBP) магмы.

Research subject. The geological profile of Sukadana Basalt Province as a large basalt outcrop in the back arc of Sumatra remains to be unclear. This also concerns the geological structures and their relationship with the Sundaland regional geology. Aim. To reveal the type and pattern of geological structures that controlled the Sukadana Basalt Province (SBP) to the surface, the distribution of Sukadana Basalt on subsurface and its relationship with Sundaland regional tectonics. Materials and Methods. A reprocessed bouguer anomaly map of Tanjungkarang quadrangle 1991 was used. Results. We found that the main eruption was located in the center of SBP. The forward modeling data show the thickness of SBP to reach 3,200 m. There are two Northwest-Southeast striking normal faults and one fissure controlling the development of SBP. These fractures served as the primary conduit for magma to ascend from the mantle to the Earth’s surface. We also found North-South striking normal faults and West-East dextral strike-slip fault that formed at Early Oligocene and indirectly supported the magma ascend to the surface. Conclusions. The North-South striking normal faults were correlated with the Sundaland oroclinal bending. These faults developed through the extrados zone, a large pull-apart area that caused the continental lithosphere to become thinner. Meanwhile, Quaternary-Northwest-Southeast striking fractures are correlated with the development of the Great Sumatra Fault. The formation of Northwest-Southeast striking fractures was affected by the Great Sumatra Fault movement, and the thinning of the back-arc crust affected by multi-extensional structures was implicated in the ascend of SBP’s magma to the surface.

базальты Сукоднаразлом СуматраСундалендгравитациянормальный (прямой) разломSukadana BasaltSumatra FaultSundalandGravityNormal faultАвторы выражают глубокую благодарность Технологическому институту Суматры за финансирование докторской стипендии, Центру геологических исследований Индонезии, местному правительству Лампунга, обществу Сукадана, разработчику QGIS, разработчику Inkscape, Google и Вирджиану Рахманде за его лучший технический вклад.We express gratitude to the Institut Teknologi Sumatera for Doctoral scholarship funding, the Geological Survey Center of Indonesia, the local government of Lampung, Sukadana society, QGIS developer, Inkscape developer, Google, and Virgian Rahmanda for his best technical contribution.ReferencesAbdurrachman M., Widiyantoro S., Priadi B., Ismail T. (2018) Geochemistry and structure of krakatoa volcano in the Sunda Strait, Indonesia. Geosci., 8, 1-10. https://doi.org/10.3390/geosciences8040111Abdurrachman M., Widiyantoro S., Priadi B., Ismail T. 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The authors declare that there are no conflicts of interest present.