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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Journal of Earth and Marine Technology (JEMT) Jurnal Geosains West Science
Muhammad Alfath Salvano Salni
Universitas Sriwijaya
Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Physics Transportation

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Perbandingan Karakteristik Lava Formasi Mandalika dan Formasi Watupatok berdasarkan Observasi Lapangan dan Petrografi di daerah Ngrayun, Jawa Timur Umu Kulsum; Idarwati Idarwati; Muhammad Alfath Salvano Salni
Jurnal Geosains West Science Vol 4 No 02 (2026): Jurnal Geosains West Science
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/jgws.v4i02.3424

Abstract

Aktivitas vulkanisme di Pegunungan Selatan Jawa menghasilkan berbagai satuan batuan gunung api yang dikenal sebagai Old Andesite Formation, termasuk Formasi Mandalika dan Formasi Watupatok yang tersingkap di daerah Ngrayun, Jawa Timur. Kedua formasi tersebut memiliki hubungan menjemari yang menunjukkan perkembangan vulkanisme pada interval waktu yang relatif sama, namun memperlihatkan karakteristik lava yang berbeda. Penelitian ini bertujuan untuk membandingkan karakteristik lava kedua formasi berdasarkan observasi lapangan dan analisis petrografi guna memahami lingkungan pembentukan dan evolusi vulkanisme di Pegunungan Selatan Jawa. Metode penelitian meliputi observasi lapangan untuk mengidentifikasi litologi, struktur batuan, dan karakteristik singkapan, serta analisis petrografi menggunakan sayatan tipis dan metode point counting untuk menentukan tekstur dan komposisi mineral batuan. Hasil penelitian menunjukkan bahwa lava Formasi Mandalika dicirikan oleh tekstur porfiritik, vesikular, struktur columnar joint, serta breksi autoklastik yang mengindikasikan proses pendinginan relatif lambat pada lingkungan subaerial. Secara petrografi, lava memperlihatkan tekstur porphyritic, glomerocryst, dan tekstur amigdaloidal. Sebaliknya, lava Formasi Watupatok menunjukkan tekstur afanitik hingga aphyric, quenched texture, mikrolit plagioklas acicular, tekstur trachyitic, rendahnya vesikularitas, serta palagonitisasi yang mengindikasikan pendinginan sangat cepat akibat interaksi langsung antara magma dan air. Perbedaan karakteristik lava pada dua formasi yang menjemari ini menunjukkan bahwa aktivitas vulkanisme di Pegunungan Selatan Jawa berkembang pada lingkungan transisi subaqueous–subaerial.
Analisis Geomorfologi Daerah Jampang Tengah dan Sekitarnya, Kabupaten Sukabumi, Provinsi Jawa Barat Muhammad Astridho Arsyad; Idarwati; Muhammad Alfath Salvano Salni
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1686

Abstract

The geomorphological analysis of the Jampang Tengah area, Sukabumi Regency, West Java, aims to identify the ongoing geomorphological processes and geomorphic units within the study area. Based on its geographical location, the study area is part of the Bogor Basin, which is characterized by relatively unique geological settings in terms of stratigraphy, geological structure, and geomorphology. The geomorphic units were identified through several aspects, including morphological (physical) aspects consisting of morphography and morphometry, as well as morphodynamic aspects. The research was conducted using field observation methods and studio analysis based on Geographic Information Systems (GIS). The research process began with preliminary identification through the interpretation of Digital Elevation Model (DEM) data, which was correlated with field features through direct observations from various strategic points. Supporting phenomena were described and measured to collect geomorphological data. The identified geomorphic units in the study area include Highly Eroded Denudational High Hills, Moderately Eroded Denudational High Hills, Fault Zone High Hills, Synclinal Hills, and Karst Hills. These geomorphic units can be utilized as information for further studies, disaster mitigation support data, and regional development planning.
Deciphering Metamorphism of Tarap Formation through Petrographic Analysis Muhammad Alfath Salvano Salni; Idarwati Idarwati
Journal of Earth and Marine Technology (JEMT) Vol 6, No 2 (2026)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2026.v6i2.8940

Abstract

Detailed petrographic characterization aimed at constraining the metamorphic evolution of the Tarap Formation remains limited. This study presents petrographic analyses of 11 metamorphic rock samples collected from the Tarap Formation in OKU Selatan, South Sumatra. The results identify a range of metamorphic rock types, including metalimestone, metasiltstone, calcite–chlorite marble, muscovite–quartz phyllite, quartz–muscovite schist, muscovite–chlorite schist, and quartz–hornblende schist. The protoliths identified were calcareous rocks, quartz–feldspathic sandstones, and shales, which may be lithologically correlated to the Kuantan Formation and Gunungkasih Complex. The metamorphic facies identified are sub-greenschist, greenschist, and lower amphibolite facies. Prograde metamorphism and the subsequent development of mylonitic texture that overprints the main foliation are interpreted to be possibly related to the tectonic evolution of Sumatra during the Early Cretaceous, particularly subduction of the Ngalau Ocean (Meso-Tethys) beneath the Sundaland margin (West Sumatra). The subsequent arc-continent collision from the Late Cretaceous, causing reverse faulting and fold–thrust deformation, facilitated exhumation of the rocks, potentially resulting in retrograde metamorphism and cataclastic texture.
Co-Authors Idarwati Idarwati Idarwati Muhammad Astridho Arsyad Umu Kulsum