LITHOLOGY OF THE COMPOSITION AND DISTRIBUTION OF GEOLOGICAL STRUCTURES ON CUMBRI HILL, BITING DISTRICT, PONOROGO REGENCY, EAST JAVA
DOI:
https://doi.org/10.33579/krvtk.v11i1.6414Keywords:
Cumbri Hill, trachyte, rudstone, structural geology, left slip faultAbstract
Cumbri Hill, situated on the boundary of Ponorogo and Wonogiri, is a narrow ridge trending northeast-southwest, formed by regional structures and variations in lithological resistance; however, comprehensive geological investigations remain scarce. This study seeks to determine the constituent lithology and examine the geological structural factors that affect the morphology of Cumbri Hill. The methodologies employed encompass geological mapping, petrographic and micropaleontological analyses, and stereonet analysis of fracture and fault data. The findings reveal that the lithology comprises rudstone limestone from the Middle Miocene (N16) within a Middle Neritic setting, which is subsequently overlain by shallow trachyte intrusions exhibiting porphyritic-vesicular textures. The geological structure is characterized by NE-SW oriented left-lateral strike-slip faults, with one site indicating a reverse left-slip mechanism attributed to a localized compressional component. This structural pattern governs the orientation of the ridge, linear valleys, and the location of the intrusion. The research findings significantly enhance the comprehension of the local magmatic and tectonic evolution of Ponorogo and act as a reference for advancing geological studies and geotourism in the area.
Downloads
References
van Bemmelen, The Geology of Indonesia. The Hague: Government Printing Office, 1949.
S. Hartono, “Geomorfologi dan Tektonik Jawa,” Proceedings of Geology Forum, 2010.
Pulunggono and S. Martodjojo, “Pre-Tertiary and Tertiary Fault Systems as a Framework of the South Sumatra Basin,” Proc. Indonesian Petroleum Assoc., vol. 23, pp. 25–46, 1994.
E. Sampurno and H. Samodra, Peta Geologi Lembar Ponorogo, Skala 1:100.000. Bandung: Pusat Penelitian dan Pengembangan Geologi, 1997.
M. Adli, B. Santoso, and F. Widiyanto, “Petrogenesis dan Relasi Intrusi–Kontak Batuan Karbonat Daerah Ponorogo Bagian Barat,” Jurnal Geologi Indonesia, 2018.
F. Muhammad, E. Suhanto, and I. Yulianto, “Biostratigrafi dan Lingkungan Pengendapan Formasi Sampung Berdasarkan Foraminifera,” Jurnal Sedimentologi dan Stratigrafi, 2018.
Latief et al., “Structural Framework of East Java: Characterizing the Pagersari Fault Zone,” Indonesian Journal on Geoscience, vol. 10, no. 10, 2021.
Streckeisen, “Classification and Nomenclature of Plutonic Rocks: Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks,” Geological Society of America Bulletin, vol. 86, pp. 553–560, 1974.
W. Blow, “Late Middle Eocene to Recent Planktonic Foraminiferal Biostratigraphy,” Brill, Leiden, 1969.
D. Tipsword et al., “Micropaleontological Zonation of Neogene Carbonates,” AAPG Bulletin, 1966.
A. Embry and J. Klovan, “A Late Devonian Reef Tract on Northeastern Banks Island, Northwest Territories,” Canadian Petroleum Geology Bulletin, vol. 19, pp. 730–781, 1971.
R. A. van Zuidam, “Aerial Photo-Interpretation in Terrain Analysis and Geomorphologic Mapping,” Enschede, Netherlands: International Institute for Aerial Survey and Earth Sciences (ITC), 1979.
R. A. van Zuidam and F. I. Para, “Guide to Geomorphological Aerial Photographic Interpretation and Mapping,” Enschede, Netherlands: ITC, 1983.
Best, M. G. (2003). Igneous and Metamorphic Petrology. Wiley-Blackwell.
C. R. Twidale, “River Patterns and Their Meaning,” Earth-Science Reviews, vol. 67, pp. 159–218, 2004.
M. J. Rickard, “Striated Fault Surfaces: Indicators of Movement on Wrench Faults,” Tectonophysics, vol. 14, no. 2, pp. 99–104, 1972.
H. R. Smyth, R. Hall, and G. Nichols, “Cenozoic Volcanic arc History of Java, SE Asia: The Stratigraphic Record of Eruptions on an Active Continental Margin,” Geological Society of America Special Papers, vol. 420, pp. 199–222, 2007
R. Hall, “Late Jurassic–Cenozoic reconstruction of the Indonesian region and the Indian Ocean,” Tectonophysics, vol. 570–571, pp. 1–41, 2012.
J. R. Curray, “The Sunda Arc: A Model for Oblique Plate Convergence,” Netherlands Journal of Sea Research, vol. 24, no. 2–3, pp. 131–140, 1989.
S. Husein, A. Setianto, and A. H. Satyana, “Structural Development of the Southern Mountains of Java: Implications for Tectonic Evolution of the Southern Margin of Java,” Indonesian Journal of Geology, vol. 15, no. 2, pp. 95–110, 2020.
S. Wijaya, S. Kusumayudha, D. Yudiantoro, and Yatini, “Geological Structural Control on the Distribution of Rock Alteration in Ngebel Lake and Surrounding Areas,” International Journal of Science and Society, vol. 7, no. 2, pp. 139–154, 2025.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2026 al hussein flowers rizqi, Fanssyah Widianto
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
All articles published Open Access will be immediately and permanently free for everyone to read and download. We are continuously working with our author communities to select the best choice of license options, currently being defined for this journal as follows:
• Creative Commons Attribution-ShareAlike (CC BY-SA)
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
