Subsurface delineation of Sukadana Basalt Province based on gravity method, Lampung, Indonesia
https://doi.org/10.24930/1681-9004-2023-23-6-1027-1037
Abstract
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.
Supporting agencies: 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.
About the Authors
L. P. Siringoringo
Bandung Institute of Technology; Sumatra Institute of Technology
Indonesia
Indonesia
Bandung 40132;
South Lampung 35365
B. Sapiie
Bandung Institute of Technology
Indonesia
Indonesia
Bandung 40132
A. Rudyawan
Bandung Institute of Technology
Indonesia
Indonesia
Bandung 40132
I.G.B.E. Sucipta
Bandung Institute of Technology
Indonesia
Indonesia
Bandung 40132
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For citations:
Siringoringo L.P., Sapiie B., Rudyawan A., Sucipta I. Subsurface delineation of Sukadana Basalt Province based on gravity method, Lampung, Indonesia. LITHOSPHERE (Russia). 2023;23(6):1027-1037. https://doi.org/10.24930/1681-9004-2023-23-6-1027-1037
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