Mekanisme Pembentukan Struktur Geologi Daerah Batu Ampar Dan Sekitarnya, Kabupaten Bengkulu Selatan, Provinsi Bengkulu
DOI:
https://doi.org/10.29303/goescienceed.v7i1.1685Keywords:
Batu Ampar, Geological Structures, Stress Regime, Digital Elevation Model (DEM), Tectonic DeformationAbstract
This study examines the mechanisms of geological structure formation in the Batu Ampar area and its surroundings through field geological mapping and interpretation of Digital Elevation Model (DEM) imagery data. Outcrop identification was conducted to determine the types of structures in tectonically deformed rocks. The observations reveal several geological structures, including the Air Kedurang I Anticline, Air Kedurang I Syncline, Air Kedurang II Anticline, Air Kedurang II Syncline, Air Kedurang III Anticline, and the Batu Ampar Thrust Fault. Structural element analysis was carried out using Win Tensor and Dips software. The analyzed data include plane orientations (strike and dip) and pitch for fault structures, while fold analysis utilized orientation data from both fold limbs. Stereonet analysis and DEM interpretation indicate that the structural orientations and surface relief patterns predominantly trend northwest–southeast (NW–SE). The results suggest that compressional forces during the Early to Late Pliocene led to fold formation, which continued into the Pleistocene and triggered the development of the Batu Ampar Thrust Fault. Overall, the geological structures in the study area are interpreted to have formed due to sustained NW–SE–oriented tectonic activity from the Pliocene to the Pleistocene.
References
Amin, T.C., Kusnama, Rustandi, E. & Gafoer, S., 1993, Geologi Lembar Manna & Enggano, Sumatra: Pusat Penelitian dan Pengembangan Geologi : Bandung, Jawa Barat.
Barber, A.J. dan Crow M.J. 2003. An evaluation of plate tectonic models for the development of Sumatra: Gondwana Research. L6. no.I . p.1-28.
Bull, W.B., & McFadden, L.D. (1977). Tectonic geomorphology north and south of the Garlock Fault, California. Geological Society of America Bulletin, 88(3), 144–156.
Burg, J.P. 2017. Thrust Systems. Lecture Structural Geology.
Fajri, S. N., Surtiyono, E., & Nalendra, S. 2019. Lineament Analysis of Digital Elevation Model to Identification of Geological Structure in Northern Manna Sub Basin, Bengkulu. IOP Conference Series: Materials Science and Engineering. IOP Publishing, Vol. 636, No. 1, p. 012001.
Fleuty. 1964. The Description of Folds. Proceedings of the Geologist Association.
Fossen, H., 2010. Structural Geology. Published in the United States of America by Cambridge University Press, New York.
Harding, T. P.. 1973. Newport-Inglewood Trend, California An Example Of Wrench Style Deformation. American Association Petroleum Geologists Bulletin. Volume 57. pp. 97-116.
Heryanto, R. 2006. Karakteristik Formasi Seblat di Daerah Bengkulu Selatan. JSDG, Vol. XVI No. 3 Mei 2006, p.179 – 195.
Howells, C. 1997. Tertiary Response to Oblique Subduction and Indentation in Sumatra. Indonesia: New ideas for hydrocarbon exploration, Geological, v.126, p.365-374.
Keller, E.A., & Pinter, N. (2002). Active Tectonics: Earthquakes, Uplift, and Landscape. Prentice Hall, New Jersey.
Kusnama, S. A. M., & Sukarna, D. 1993. Tertiary stratigraphy and tectonic evolution of southern Sumatra. Geology Society of Malaysia: Kuala Lumpur, p 143 – 152.
Pulunggono, A., Agus, H.S., dan Christine, G. K. 1992. Pre-Tertiary and Tertiary Fault Systems, As a Framework of The South Sumatra Basin : A Study of SAR Maps. Indonesian Petroleum Association, Proceedings 21th AnnualConvention, p.338 360.
Ramírez-Herrera, M.T. (1998). Geomorphic assessment of active tectonics in the Mexican Volcanic Belt. Geomorphology, 24(2–3), 91–108.
Ramsay, J.G., & Huber, M.I. (1987). The Techniques of Modern Structural Geology, Vol. 2: Folds and Fractures. Academic Press, London.
Rickard, M. K. (1972). Fault Classification Discussion. Geological Society of American Bulletin, 83, 2545-2546.
Yulihanto, B., Situmorang, B., Nunljajadi, A. dan Sain, B. 1995. Structural Analysis of The Oshore Bengkulu Fore-arc Basin and Its Implication for Future Hydrocarbon Exploration Activity. Jakarta: Indonesian Petroleum Association, Proceedings 24th Annual Convention, p.85-96.
