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All Journal JGE (Jurnal Geofisika Eksplorasi) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi Journal of Sciencce Technology and Visual Culture
Rezki Naufan Hendrawan
Institut Teknologi Sumatera
Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Formasi Sabu Sebagai Endapan Kolisi Busur Gunungapi Woyla dengan Lempeng Sumatra Barat Angga Jati Widiatama; Rezki Naufan Hendrawan; Evan Rosyadi Ogara; Lauti Dwita Santy; Vallery Inggrid Evitayanti; Lammartua Satria Nusatara Sagala
Jurnal Geosains dan Teknologi Vol 5, No 2 (2022): Juli 2022
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.5.2.2022.104-115

Abstract

Geologi wilayah Lampung relatif masih memiliki referensi yang rendah khususnya tentang formasi batuan sedimen. Salah satu formasi batuan sedimen di Lampung adalah Formasi Sabu yangtersusun atas konglomerat aneka bahan, batupasir, dan batulempung berumur Paleosen hingga Oligosen yang belum diteliti karakteristik batuan asalnya.Penelitian ini bertujuan untuk mengetahui variasi jenis provinsi tektonik sedimen Formasi Sabu menggunakan metode modal komposisidengan metode perhitungan poin counting terhadap dua belas sampel sayatan tipis yang diambil dari hasil pengukuran penampang stratigrafi setebal 47 m. Formasi Sabu pada lokasi penelitian dapat dibagi menjadi tiga segmen, segmen bawah memiliki provenan dari provinsi tektonik recycled orogen, segmen tengah memiliki provinsi tektonik dissected arc hingga basement uplift, segmen atas memiliki provenan dari dissected arc yang berupa plutonic magmatic arc. Variasi provinsi tektonik ini disebabkan akibatkondisi sumber sedimen berasal dari pegunungan hasil tabrakan antara busur gunungapi Woyla dan terrane Sumatra Barat yang menjadi sumber sedimen provinsi tektonik recycled orogen dan magmatic arc. Tabrakan busur gunungapi Woyla dan terrane Sumatra Barat secara diakronus ditafsirkan memicu terbentuknya sesar mendatar besar yang memicu tersingkapnya batuan alas berupa pluton granit yang menjadi sumber provinsi basement uplift hingga plutonic magmatic arc. Formasi Sabu diintepretasikan terendapkan pada cekungan pull apart yang terbentuk dari sistem sesar mendatar yang terbentuk pada umur Paleogen.
MIKROFASIES DAN DIAGENESIS ANGGOTA BATUGAMPING FORMASI KUANTAN DI NGALAU BASUREK, SUMATERA BARAT, INDONESIA Angga Jati widiatama; Rezki Naufan Hendrawan; Sonya Rejeki Siahaan
JGE (Jurnal Geofisika Eksplorasi) Vol 9, No 2 (2023)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v9i2.267

Abstract

Fomasi Kuantan merupakan batuan tertua pada terrane Sumatra Barat yang tersingkap di Ngalau Basurek, Sijunjung, Sumatra Barat. Penelitian tentang  batugamping Formasi Kuantan masih relatif sedikit sehingga penelitian ini bertujuan untuk mengetahui karakteristik mikrofasies dan diagenesis batugamping Formasi Kuantan. Penelitian dilakukan dengan membuat lintasan geologi disepanjang Goa Ngalau Basurek. Deskripsi petrografi digunakan untuk menentukan mikrofasies, zona fasies, dan diagenesis batugamping. Formasi Kuantan di Ngalau Basurek menunjukkan memiliki empat mikrofasies yaitu  mudstone, coated bioclastic grainstone, peloid grainstone, dan batugamping kristalin yang dikelompokkan ke dalam standar mikro fasies 11. Lingkungan pengendapan Formasi Kuantan berada pada carbonate platform margin sand shoal (FZ 6). Terdapat dua lingkungan diagenesis dari batugamping Formasi Kuantan yaitu lingkungan burial-marine yang ditandai dengan mikrit yang mengalami neomorfisme menjadi sparit dan lingkungan meteoric vadose-phreatic  yang ditandai dengan semen tipe blocky dan drusy yang mengisi rekahan pada batugamping. Lingkungan burial terjadi saat umur Karbon hingga Permian sedangkan lingkungan meteoric terjadi pada umur Trias hingga Kuarter.
Persebaran struktur geologi dan batuan pra-tersier pada Pulau Bangka bagian utara Rezki Naufan Hendrawan; Benyamin Sapiie; Nurcahyo Indro Basuki
Journal of Science, Technology, and Visual Culture Vol 1 No 2 (2021): Oktober 2021
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Northern Bangka Island composed by Permian Pemali Metamorphic Complex and Late Triassic – Early Jurassic S-type Klabat Granite. Tectonic phase of Northern Bangka Island indicated a similar pattern with Bentong-Raub Suture Zone in Peninsula Malaysia. Suture Zone marked by several kind of metamorphic rocks and granites with different lithology. The research used random sampling field observation to find structural data and fabric element of rocks. Pre-Tertiary rocks in Northern Bangka Island consist of quartz schist, mica phyllite, granodiorite, granite, sandstone, and conglomerate. That rocks commonly record lineation, foliation, S-C fabric, fold, fault, and joint as kinematic indicator.
GEOMORPHIC INDICES AND FAULT SEGMENTATION INDICATION OF MENANGA FAULT AT PESAWARAN, LAMPUNG Hendrawan, Rezki Naufan; Draniswari, Windi Anarta; Bakhtiar, Agim Yustian; Widiatama, Angga Jati
JGE (Jurnal Geofisika Eksplorasi) Vol 9, No 3 (2023)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v9i3.287

Abstract

Remote sensing and GIS are playing important roles in geomorphology and hazard risks analysis. Pesawaran area located near the Menanga Fault and recently on the risk of earthquake that happened along this fault.  Thus, it is essential to investigate the area actively affected by Menanga Fault as preliminary research about hazard risk related to Menanga Fault. The morphometry method based on DEMNAS and Landsat 8 was applied to evaluate the zone affected by Menanga Fault, and fracture data analysis was conducted to consider the possibility of fault segmentation resulting from its mechanism. The study area can be divided into 3 zones; zone A is greatly affected by Menanga Fault activity, zone B is affected by Menanga Fault and Mt. Pesawaran development, and zone C is tectonically less affected. Zone A landforms were not only formed as a result of Menanga Thrust fault but also the strike-slip fault segment.  Fault segmentation exists in this zone with different mechanisms (strike-slip and dip-slip), producing lineaments with different trends, and differentiation of river patterns.
Metamorphic Complex Deformation in North Bangka Island Based on Macrostructures and Microstructures Evidences Hendrawan, Rezki; Draniswari, Windi Anarta; Wahyuni, Fitri Indah; Sapiie, Benjamin; Basuki, Nurcahyo Indro
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.13379

Abstract

The northern Bangka Island is composed of Pemali metamorphic complex which is indicated by the collision between Indochina and Sibumasu blocks. These features are interesting to observe because the metamorphic rocks could be recorded in some geological structures at different times. The study began by conducting field observation on Pemali Metamorphic Complex as objects. Field observation aims to collect lithological data, structural data, and oriented rock samples. The results of field pitching were processed to determine macrostructures, microstructures, and mineral distribution. The data was analyzed based on kinematic, descriptive, and deformation mechanisms to determine the deformation patterns that occurred in the study area. Field and oriented thin section data show structures and occurred in different deformation conditions. The analysis based on macrostructures and microstructures showed that the northern part of Bangka Island experienced three different deformation phases. Deformation begins with the formation of folds that are associated with collisions between Sibumasu-Indochina, followed by a second deformation that forms a fold with different verging. Both deformations are formed in the ductile zone and the brittle-ductile transition zone. The third deformation occurs when rocks have been lifted to the surface by the presence of faults, joints, and veins. The sequence of the deformation model is similar to the deformation experienced in the Bentong-Raub suture zone formed in the shear zone.
Slope Stability Analysis Throughout Road Around Bukit Barisan Selatan National Park (BBSNP) using Fellenius Method Radityo, Daniel; Bilal Al Farishi; Rezky Naufan Hendrawan; Alviyanda; Imam Ahmad Sadisun
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14902

Abstract

Bukit Barisan Selatan National Park (BBSNP) is a nature conservation area in Indonesia. The slope stability of the interprovincial roads in BBSNP needs to be assessed for slope stability. This study assesses slope stability using the Fellenius method for the factor of safety calculation. The data utilized consists of geological and structure regional conditions, soil descriptions, soil physical and mechanical properties, water content, liquid limit, plastic limit, plasticity index, specific gravity, soil strength, slope dimensions, and slope weight. The sampling process is conducted un-disturb, followed by laboratory testing. The laboratory tests conducted include soil elasticity and plasticity, soil cohesion, and internal friction angle. The critical slopes at LT-L01 and LT-L23 are compromised due to the low cohesion values, making both slopes susceptible to landslides. The stable slope at LT-R04, LT-L15, LT-L19, and LT-R30 exhibit variability properties across the slopes. The lithology for slope LT-R04 consists of inorganic clay with high plasticity, slopes LT-L15 and LT-R30 have same lithology of silty clay with medium plasticity, while slope LT-L19 has lithology of silty clay with low plasticity. The safety factor values indicate stability due to moderate - high cohesion, contributing to slope stability. Material compaction is required to enhance cohesion values on the slopes. Additionally, need to mitigate water saturation conditions in the slope materials.
Co-Authors Alviyanda Angga Jati Widiatama Bakhtiar, Agim Yustian Basuki, Nurcahyo Indro Benyamin Sapiie Bilal Al Farishi Draniswari, Windi Anarta Evan Rosyadi Ogara Imam Ahmad Sadisun Lammartua Satria Nusatara Sagala Lauti Dwita Santy Nurcahyo Indro Basuki Radityo, Daniel Sapiie, Benjamin Sonya Rejeki Siahaan Vallery Inggrid Evitayanti Wahyuni, Fitri Indah Widiatama, Angga Jati