THE STRATIGRAPHY AND GEOLOGICAL STRUCTURE IN KOTAAGUNG TIMUR DISTRICT, TANGGAMUS, LAMPUNG
DOI:
https://doi.org/10.23960/jge.v11i1.477Keywords:
Mount Gisting, Mount Tanggamus, East KotaagungAbstract
Kotaagung Timur region, Tanggamus Regency, Lampung, is the focus area of this research. In general, the area has a unique and complex geological setting such as the variety of volcanic rocks, granite, and the Sumatran Fault System that through this area. Geological research aims to obtain geology dynamics about stratigraphy and geology structure in the research area. Two analyses have been done to achieve these goals, i.e., field observation, petrography analysis, and structural geology analysis. The stratigraphy units of the study area are composed of volcanic rocks, plutonic rocks, and surface deposits and can be divided into eleven lithostratigraphic units. The stratigraphy of the research area can be grouped into 5 groups, i.e., the Mount Gisting volcanic group, the granitoid pluton group, the Cawang Haro Mountains volcanic group, the Mount Tanggamus volcanic group, and the alluvial deposit. Geological structures are well developed, and the research area is cut by ten faults, such as dextral strike-slip faults, sinistral strike-slip faults, and reverse faults. Based on these things, the geological history of the study area started in the Late Oligocene with three episodes of volcanism. The first episode was Mount Gisting’s volcanism during the Late Oligocene-Early Miocene, followed by the granitoid intrusion. The volcanic products of the Cawang Haro Mountains in the Middle Miocene mark the second episode. The last volcanic episode occurred in the Holocene, it came from Mount Tanggamus’s volcanism. The development of the structural geology happened before the previous volcanism episode.
References
Amin, T. C., Sidarto, Santosa, S., & Gunawan, W. (1993). Geological Map of the Kotaagunf Quadrangle, Sumatera.
Amin, T. C., Sidarto, Santosa, S., & Gunawan, W. (1994). Geology of the Kotaagung Quadrangle, Sumatera.
Aribowo, S., Muslim, D., Winantris, Natawidjaja, D. H., & Daryono, M. R. (2017). Sub-Segmentasi Sesar Pada Segmen Kumering Antara Danau Ranau Hingga Lembah Suoh, Lampung Barat. Jurnal Lingkungan Dan Bencana Geologi, 8, 31–46. http://jlbg.geologi.esdm.go.id/index.php/jlbg
Barber, A. J., & Crow, M. J. (2005). Structure and structural history. In A.J. Barber, M.J. Crow, & J.S. Milsom (Eds.), Sumatra: Geology, Resources, and Tectonic Evolution (pp. 175–233). The Geological Society. http://mem.lyellcollection.org/
Barber, A. J., Crow, M. J., & Milsom, J. S. (2005). Tectonic Evolution. In Sumatra: Geology, Resources and Tectonic Evolution (Vol. 31, pp. 234–259). www.geolsoc.org.uk.
Bellon, H., Maury, R. C., Soeria-atmadja, R., Cotten, J., & Polvé, M. (2004). long magmatic activity in Sumatra (Indonesia), from Paleocene to Present. In Bull. Soc. géol. Fr (Issue 1).
Corbett, G. J., Leach Greg Corbett, T. M., & Leach Terry Leach, T. (1997). Southwest Pacific Rim Gold-Copper Systems: Structure, Alteration, and Mineralization.
Fossen, H. (2016). Structural Geology. Cambridge University Press.
Le Bas, M. J., & Streckeisen, A. L. (1991). The IUGS systematics of igneous rocks. Journal of the Geological Society, 148(5), 825–833. https://doi.org/10.1144/gsjgs.148.5.0825
Mangga, S. A., Amirudin, Suwarti, T., Gafoer, S., & Sidarto. (1993). Peta Geologi Lembar Tanjung Karang, Sumatera.
McCarthy, A. J., & Elders, C. F. (1997). Cenozoic deformation in Sumatra: oblique subduction and the development of the Sumatran Fault System. In A. J. Fraser, S. J. Matthews, & R. W. Murphy (Eds.), Petroleum Geology of Southeast Asia (pp. 335–363). Geological Society. http://sp.lyellcollection.org/
Mccourt, W. J., Crow, M. J., Cobbing, E. J., & Amin, T. C. (1996). Mesozoic and Cenozoic plutonic evolution of SE Asia: evidence from Sumatra, Indonesia. In R. Hall & D. Blundell (Eds.), Tectonic Evolution of Southeast Asia (pp. 321–335). Geological Society. http://sp.lyellcollection.org/
Moody, J. D., & Hill, M. J. (1956). Wrench-Fault Tectonics. Bulletin of The Geological Society of America, 67, 1207–1246.
Mukti, M. M. (2018). Structural Configuration and Depositional History of The Semangko Pull-Apart Basin in The Southeastern Segment of Sumatra Fault Zone. Riset Geologi Dan Pertambangan, 28(1), 115. https://doi.org/10.14203/risetgeotam2018.v28.954
Natawidjaja, D. H. (2018). Updating active fault maps and sliprates along the Sumatran Fault Zone, Indonesia. IOP Conference Series: Earth and Environmental Science, 118(1). https://doi.org/10.1088/1755-1315/118/1/012001
Rickard, M. J. (1972). Fault classification: Discussion. Bulletin of the Geological Society of America, 83(8), 2545–2546. https://doi.org/10.1130/0016-7606(1972)83[2545:FCD]2.0.CO;2
Schmid, R. (1981). Descriptive nomenclature and classification of pyroclastic deposits and fragments - Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks. Geologische Rundschau, 70(2), 794–799. https://doi.org/10.1007/BF01822152/METRICS
Setiawan, I., Zulkarnain, I., Indarto, S., Sudarsono, dan, & Indarto dan Sudarsono, S. (2005). Alterasi dan Mineralisasi di Sayap Barat Pegunungan. In Pertambangan Jilid (Vol. 15, Issue 1).
Sieh, K., & Natawidjaja, D. (2000). Neotectonics of the Sumatran fault, Indonesia. Journal of Geophysical Research: Solid Earth, 105(B12), 28295–28326. https://doi.org/10.1029/2000jb900120
Susilohadi, S., Gaedicke, C., & Djajadihardja, Y. (2009). Structures and sedimentary deposition in the Sunda Strait, Indonesia. Tectonophysics, 467(1–4), 55–71. https://doi.org/10.1016/J.TECTO.2008.12.015
Wilcox, R. E. , Harding, T. P. , & Seely, D. R. (1973). Basic Wrench Tectonics. AAPG Bulletin, 57(1), 74–96. http://archives.datapages.com/data/bulletns/1971-73/data/pg/0057/0001/0050/0074.htm
Zulkarnain, I. (2011). Geochemical Evidence of Island-Arc Origin for Sumatra Island; A New Perspective based on Volcanic Rocks in Lampung Province, Indonesia. Jurnal Geologi Indonesia, 6(Desember), 213–225.
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