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All Journal Jurnal TAMBORA Journal of Earth and Marine Technology (JEMT)
Sayidatina Hayatuzzahra
Universitas Teknologi Sumbawa
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Energy Industrial & Manufacturing Engineering Physics Transportation

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IDENTIFIKASI KEBERADAAN SESAR MENGGUNAKAN METODE GRAVITASI DAN ANALISIS SECOND VERTICAL DERIVATIVE (SVD) DI BAGIAN SELATAN KABUPATEN SUMBAWA Adella Ulyandana Jayatri; Warni Multi; Sayidatina Hayatuzzahra
Jurnal TAMBORA Vol. 7 No. 2 (2023): EDISI 19
Publisher : Wakil Rektor 3, Direktorat Riset, Publikasi dan Inovasi, Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/jt.v7i2.2954

Abstract

Penelitian mengenai identifikasi sesar di Kabupaten Sumbawa bagian selatan ini dilakukan dengan menggunakan metode gravitasi. Penelitian Data yang digunakan berupa data Free Air Anomaly (FAA) dan Topografi yang merupakan data citra saletit TOPEX. Data tersebut dilakukan koreksi Bouguer dan Terrain untuk diperoleh data anomali bouguer lengkap. Nilai Anomali bouguer lengkap dilakukan pemisahan anomali regional dan anomali residual dengan menggunakan filter Gaussian. Anomali regional memiliki rentang nilai 115.0 mGal sampai 164.2 mGal sedangkan anomali residual memiliki rentang nilai -8.8 mGal sampai dengan 6.8 mGal. Pada Anomali residual menunjukkan zona anomali rendah pada zona selatan bagian tengah yang dipengaruhi oleh densitas batuan di zona tersebut yang berupa alluvial dan endapan pantai. Anomali residual yang dihasilkan dilakukan analisis second vertical derivative (SVD) untuk mengidentifikasi jenis sesar/patahan di wilayah tersebut. Berdasarkan interpretasi, zona sesar/patahan berada pada nilai anomali rendah yang diapit oleh nilai anomali tinggi sehingga patahan yang berada di bagian selatan daerah penelitian relatif berarah Timurlaut-Baratdaya. Grafik hasil slicing menunjukkan nilai maksimum lebih kecil dibandingkan mutlak nilai minimum sehingga disimpulkan bahwa sesar di kawasan tersebut merupakan sesar naik.
Petrogenesis of Andesite Rocks in Datae Area, Sidenreng Rappang Regency, South Sulawesi Province Sayidatina Hayatuzzahra; Septyo Uji Pratomo
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
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.2023.v4i1.4695

Abstract

The research area is in the Datae Area, Watangpulu District, Sidenreng Rappang Regency, South Sulawesi Province. This study aims to determine the distribution of volcanic rocks, determine the crystallization phase based on petrographic analysis, and determine the type, magma affinity and tectonic environment based on geochemical data. The method used in this study was field data collection and rock sampling for analysis through petrographic analysis and geochemical analysis using the X-Ray Fluorescence (XRF) method by analysing the main elements, trace elements and rare earth elements (REE). The results of the petrographic analysis show that the rocks found in the field are volcanic breccia and ignimbrite. Volcanic breccia showed coarse-grained texture composed of angular to rounded andesite fragments and pyroclastic material fused together in a matrix. Meanwhile, ignimbrite showed fine grained texture with lapilli to boulder-sized fragments, poor sorting, open-packed and non-layered structure. Based on the Total Alkali Silika (TAS) diagram, AFM diagram, and binary diagram, the results of the geochemical analysis showed that the rocks found in the study area were andesite and trachy-andesite, while the magma affinity area is high-K calc-alkaline and shoshonitic. High-K calc-alkaline magmas are associated with subduction zones and are characterized by elevated levels of potassium and aluminum, while shoshonitic magmas are typically found in intraplate or back-arc settings, characterized by their distinctive potassium, sodium, and barium-rich compositions. The results from ternary diagram and geochemical Spider plots proved that the magma tectonic environment is island arc—continental arc basalt, indicating that the rock was formed in a subduction area. This research supports previous research regarding the tectonics of the western arm of Sulawesi, which stated that this area was formed by subduction.
Co-Authors Adella Ulyandana Jayatri Pratomo, Septyo Uji Warni Multi Yuni Yolanda