Karakteristik Batuan Pra-Tersier dan Tersier Berdasarkan Metode Petrografi Studi Kasus pada Daerah Muaro Sijunjung, dan Sekitarnya, Kabupaten Sijunjung, Sumatera Barat
DOI:
https://doi.org/10.29303/goescienceed.v7i3.2039Keywords:
Petrography, Pre-Tertiary Rocks, Tertiary Rocks, Muaro SijunjungAbstract
The Muaro Sijunjung area and its surroundings, Sijunjung Regency, West Sumatra, have complex geological conditions due to the influence of tectonic, magmatic, and sedimentary processes that have occurred from the Pre-Tertiary to the Tertiary periods. This study aims to identify the characteristics of Pre-Tertiary and Tertiary rocks based on petrographic analysis to understand their mineralogical composition, texture, and formation processes. The research method involved petrographic observation of thin sections using a polarizing microscope with parallel and crossed nicols. The analyzed samples were sourced from the Kuantan Formation (Pckl), Granite Intrusion (Tgr), Sawahtambang Formation (Tost), and Ombilin Formation (Tmo). Analysis results indicate that the Kuantan Formation consists of crystalline limestone classified as Dismicrite Mudstone, while the Granite Intrusion comprises Monzo-Granite and Syeno-Granite. The Sawahtambang Formation is dominated by non-carbonate sandstone classified as Sublitharenite Arkose, while the Ombilin Formation consists of carbonate sandstone and carbonate mudstone, classified as Lithic Wacke and Mudrock, respectively. The observed mineralogical and textural characteristics indicate the influence of diagenetic, sedimentary, magmatic, and alteration processes on each rock unit. The research results indicate that the geological evolution of the Muaro Sijunjung area is controlled by the interaction of sedimentary processes, magmatic intrusions, and tectonic activity that occurred from the Pre-Tertiary to the Tertiary periods.
References
Advokaat, E. L., Marshall, N. T., Li, S., Spakman, W., Krijgsman, W., & van Hinsbergen, D. J. J. (2018). Cenozoic Rotation History of Borneo and Sundaland, SE Asia Revealed by Paleomagnetism, Seismic Tomography, and Kinematic Reconstruction. Tectonics, 37(8), 2486–2512.https://doi.org/10.1029/2018TC005010
Barber et al. (2005). Sumatra: Geology, Resources and Tectonic Evolution. Geological Society of London, Memoir 31.
Dunham, R. J. (1962). Classification of carbonate rocks according to depositional texture. In W. E. Ham (Ed.), Classification of carbonate rocks: A symposium (pp. 108–121). American Association of Petroleum Geologists.
Embry, A. F., & Klovan, J. E. (1971). A Late Devonian reef tract on northeastern Banks Island, NWT. Bulletin of Canadian Petroleum Geology, 19(4), 730–781.
Folk, R. L. (1962). Spectral subdivision of limestone types. In W. E. Ham (Ed.), Classification of carbonate rocks: A symposium (pp. 62–84). American Association of Petroleum Geologists.
Habrianta, L., Matthew, G., Fakhrurozi, F., Auliansyah, D., & Andhika, I. P. (2018). A semi-regional play analysis of the Ombilin Basin to understand the tectono-stratigraphic framework and identification of potential exploration opportunities. Proceedings of the Indonesian Petroleum Association 42nd Annual Convention, IPA18-482-G, 1–22.
Hall, R. (2012). Late Jurassic-Cenozoic reconstructions of the Indonesian region and the Indian Ocean. Tectonophysics, 570–571, 1–41. https://doi.org/10.1016/j.tecto.2012.04.021.
Le Maitre, R. W. (Ed.). (1989). A classification of igneous rocks and glossary of terms: Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks. Blackwell Scientific Publications.
Metcalfe, I. (2017). Tectonic evolution of Sundaland. Bulletin of the Geological Society of Malaysia, 63(June), 27–60. https://doi.org/10.7186/bgsm63201702
Nesse. (2012). An Introduction to Mineralogy. An Introduction to the Study of Mineralogy,1–14.https://doi.org/10.5772/34161
Noeradi, D., Djuhaeni, & Simanjuntak, B. (2005). Rift play in Ombilin Basin outcrop, West Sumatra. Proceedings of the Indonesian Petroleum Association, 30th Annual Convention.
Pettijohn, F. J. (1975). Sedimentary rocks (3rd ed.). Harper & Row Publishers.
Pulunggono, A., Haryo, A. S., & Kosuma, C. G. (1992). Pre-Tertiary and Tertiary fault systems as a framework of the South Sumatra Basin: A study of SAR-maps. In Proceedings of the Indonesian Petroleum Association, 21st Annual Convention (Vol. 1, pp. 339–360). Indonesian Petroleum Association.
Streckeisen, A. L. (1976). Classification and nomenclature of igneous rocks. Neues Jahrbuch für Mineralogie, Abhandlungen, 107, 144–240.
Zaim, Y., Habrianta, L., Abdullah, C. I., Rizal, Y., Basuki, N. I., & Sitorus, F. E. (2012). Depositional History and Petroleum Potential of Ombilin Basin, West Sumatra-Indonesia, Based on Surface Geological Data. Search and Discovery Article, 10449.
