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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Maulana, Muhammad Hafidz
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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CHARACTERISTICS OF LIMESTONES FROM THE CIBODAS FORMATION AND CIKARANG MEMBER OF JAMPANG FORMATION IN CIKANGKUNG AREA, SUKABUMI REGENCY, WEST JAVA Maulana, Muhammad Hafidz; Pratiwi, Santi Dwi
Bulletin of Scientific Contribution Vol 22, No 3 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i3.59237

Abstract

This research aims to identify the lithological characteristics as well as the occurrence of larger benthic foraminifera in limestone from the Cikangkung and surrounding area, Sukabumi Regency with coordinates between 106°25'40.707" E to 106°28'23.581" E and 7°19'00.738" S to 7°21'12.833" S. The area is predominantly by rock units belonging to the Cikarang Member of the Jampang Formation and the Cibodas Formation. With focuses on classifying limestone and distinguishing the limestone from those two formations through petrographic characteristics, and microfossil analysis, four types of limestone were identified as tuffaceous limestone, grainstone, packstone, and boundstone. Petrographic analysis shows compositional differences in the tuffaceous limestone, which contains pyroclastic materials such as glass, silica minerals, and mafic minerals, in line with the high volcanic activity. Based on ten species of the larger benthic foraminifera, tuffaceous limestone was deposited during the Early Miocene (Te5),  which led to the age of deposition of carbonate volcaniclastic rocks in the Cikarang Member of Jampang Formation. Meanwhile, the other three limestone types do not contain pyroclastic components, indicating low volcanic activity during their deposition and it was deposited during the Mio-Pliocene. Based on similarities in age, environment, and characteristics of grainstone, packstone, and boundstone types are grouped as part of the Cibodas Formation, which was deposited during the Late Miocene to Pliocene (Tf3–Th). This study contributes to understanding the stratigraphic differences and the geological history of the limestone in this region, highlighting the influence of volcanic and marine processes on limestone formation.Keywords: Limestone, Cikangkung, Cibodas Formation, Cikarang Member of Jampang Formation
GEOMORPHOLOGICAL ASPECT ANALYSIS IN CIKANGKUNG AND SURROUNDING AREA, CIRACAP SUBDISTRICT, SUKABUMI REGENCY, WEST JAVA Maulana, Muhammad Hafidz; Pratiwi, Santi Dwi; Rosana, Mega Fatimah
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i2.60774

Abstract

The Ciletuh–Jampang area, located in the southern part of Java Island exhibits distinct geomorphological characteristics shaped by a combination of endogenous and exogenous geological processes over an extended period. This study analyzes the geomorphology of the region using field observations and remote sensing, focusing on morphographic, morphometric, and morphogenetic aspects, specifically in Cikangkung area, Ciracap Subdistrict, Sukabumi Regency, West Java. Based on those three geomorphological aspects, this area could be divided into four different units, such as marine lowland, denudational lowland, gently sloping structural lowhills, and sloping structural lowhills. These units are formed by interactions between tectonic activity, volcanism, weathering, erosion, and sedimentation processes. Tectonic uplift, volcanic contributions, and variations in rock resistance have significantly influenced landforms, while exogenous processes have shaped terrain forms, drainage patterns, and top-soil thickness. The results reveal that these processes not only define the region's unique morphological features but also influence its diverse land use practices, including agriculture and settlements. Keyword: Geomorphology, Ciletuh-Jampang, Cikangkung, Landform, Remote Sensing
KARAKTERISTIK BATUAN SEDIMEN DI HILIR SUNGAI CI GANGSA, KECAMATAN SURADE, KABUPATEN SUKABUMI, JAWA BARAT Maulana, Muhammad Hafidz; Pratiwi, Santi Dwi; Patonah, Aton
Bulletin of Scientific Contribution Vol 23, No 1 (2025): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v23i1.62938

Abstract

Kawasan Ciletuh memiliki keragaman geologi yang kompleks. Keragaman ini merupakan hasil dari berbagai fenomena geologi yang telah terjadi sejak zaman Kapur. Salah satu keragaman geologi yang dimiliki oleh daerah Ciletuh adalah keragaman jenis batuan penyusun Formasi Jampang. Tujuan penelitian ini adalah untuk mengidentifikasi karakteristik batuan sedimen yang terdapat pada Anggota Cikarang dari Formasi Jampang. Metode yang digunakan mencakup observasi lapangan di bagian hilir Sungai Ci Gangsa dan analisis petrografi terhadap beberapa sampel batuan. Hasil penelitian menunjukkan bahwa terdapat tiga jenis batuan, antara lain batupasir (feldspathic wacke), tuf (lithic tuff), serta batugamping (packstone dan wackestone). Komposisi dari tiap batuannya menunjukkan adanya campuran material, meliputi material silisiklastik, vulkanik, dan karbonat. Hal ini dapat mengonfirmasi kondisi ketika pengendapan berlangsung, kemungkinan berupa lingkungan laut yang dipengaruhi oleh aktivitas vulkanik.Kata Kunci : Anggota Cikarang dari Formasi Jampang, Batuan Sedimen, Petrografi, Sungai Ci Gangsa, Ciletuh, Miosen.
Co-Authors Aton Patonah, Aton Mega Fatimah Rosana