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All Journal Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Wijaya, Naufal Arya
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Kontrol Struktur Geologi terhadap Sebaran Skis Grafit di Perbukitan Jiwo Timur, Bayat, Klaten, Jawa Tengah Kurniawan, Sandi; Rizqi, Al Hussein Flowers; Audrey, Vivi Fistina; Wijaya, Naufal Arya
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The construction of the Jogja - Solo toll road has incised piles of metamorphic rock that have just been exposed and can be used as research studies. A chunk of skis is found in a hillside fill in the East Jiwo area east of the Dengkeng river. As for specific research studies regarding graphite skis, it has never been studied clearly either in terms of its distribution or rock composition. This study covers an area where there is a distribution of graphite-skis lithology in the East Jiwo hills. The research areas are in Kebon Village and Gunung Gajah Village, Bayat District, Klaten Regency, Central Java. The aim of the study was to examine the lithology of graphite skies in detail using petrographic incisions and to interpret the geological structures that control the distribution of graphite skis in the study area. The research method includes field study stages that focus on collecting lithology, stratigraphy and geological structure data. Rock sampling is used in petrographic analysis. Retrieval of geological structure data includes data collection on foliation, joints, straightness, and drag faults and minor faults. The results of the geological structure analysis will provide an overview of the main stress directions that control the study area. The lithology of Kebon Village and Gununggajah Village was composed by Graphite Skis and Graphite Skis – Mika. The influence of geological structure controls the presence of graphite skis with the (Reverse Left Slip Fault) and Down-Right Fault (Normal Right Slip Fault). The two faults are thought to have formed simultaneously with the formation of the second-order Dengkeng fault.
Investigasi Lingkungan Pengendapan berdasarkan Fasies Batuan Karbonat Formasi Pamutuan Daerah Sindangsari dan Sekitarnya, Cimerak, Pangandaran, Provinsi Jawa Barat Fistina Audrey, Vivi; Rizqi, Al Hussein Flowers; Kurniawan, Sandi; Wijaya, Naufal Arya; Sugarbo, Oky
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The research area is in the Sindangsari and surrounding areas, Cimerak District, Pangandaran Regency, West Java Province. The study area is included in the Pamutuan Formation, which is exposed in the South of the Karangnunggal map sheet, the Middle Miocene Pamutuan Formation, with a shallow marine depositional environment. Differences in sedimentation processes and the relationship between formations at several locations are thought to be due to the influence of early paleogeography. This is an interesting study because it can provide a specific description of the development of the depositional environment in the study area. In order to understand the Pamutuan Formation's sedimentation process, facies and depositional environment analyses were carried out in this study. The method used in this study included collecting data by selecting representative samples and carrying out petrological and petrographic descriptions to determine a facies such as lithology. Based on data analysis, four rock facies were obtained; Greywacke lithic and Mudrock, Bounstone, facies Packstone, and Mudstone. These facies were deposited in four alternating depositional environments: sand shoals, reef margin, slope, and toe of the slope. Microfossil analysis shows that carbonate rocks from the Pamutuan Formation in the study area were deposited at N 13 – N 14 (Middle Miocene) in the Middle Neritic – Outer Neritic environment (100 – 200 meters). Keyword : facies, depositional environment, pamutuan, Southern mountain, pangandaran.
Co-Authors Al Hussein Flowers Rizqi Audrey, Vivi Fistina Fistina Audrey, Vivi Oky Sugarbo SANDI KURNIAWAN