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KARAKTERISTIK ENDAPAN KUARTER DAN KEBERADAAN AIR TANAH BERDASARKAN PENAFSIRAN DATA GEORADAR DI PESISIR PANTAI BARAT DAYA PULAU ROTE Muhammad Zulfikar; Fauzi Budi Prasetio; Undang Hernawan
JURNAL GEOLOGI KELAUTAN Vol 18, No 2 (2020)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.18.2.2020.619

Pulau Rote merupakan pulau bagian selatan wilayah Indonesia yang terbentuk akibat adanya kolisi antara dua lempeng benua antara Australia – Asia, sehingga terjadi pengangkatan yang membentuk daratan hingga saat ini. Formasi batuan yang tersingkap di permukaan bagian timur - selatan Pulau Rote tersusun atas endapan-endapan Kuarter dan Formasi Batuan berumur Kuarter yang terdiri dari Endapan Aluvium dan Endapan Pantai (Qa), Endapan Konglomerat (Qac), Batugamping Koral (Ql), Formasi Noele (Qtn). Tujuan penelitian ini adalah untuk memberikan gambaran kondisi endapan kuarter bawah permukaan dan kemunginan keberadaan air tanah. Survei ini menggunakan peralatan Ground Peneterating Radar (GPR) tipe Sirveyor 20, antenna (MLF) frekuensi 40 MHz dan software Radan 5 untuk pemrosesan data. Hasil identifikasi fasies radar menunjukkan bahwa kondisi geologi di bawah permukaan pada kedalaman 15 – 30 meter merupakan batupasir yang dapat disebandingkan dengan Formasi Noele (Qtn). Pada kedalaman 2-15 meter merupakan lapisan yang tersusun atas batugamping bioklastik (batugamping koral) yang dapat disebandingkan dengan Batugamping Koral berumur Kuarter (Ql). Pada kedalaman 0-1 meter merupakan endapan pantai berumur Holosen yang dapat disebandingkan dengan Endapan Alluvium dan Endapan Pantai (Qa). Keberadaan air tanah diperkirakan berada pada lapisan Batugamping Koral dengan kedalaman sekitar 12-15 meter.Kata kunci: Georadar, GPR, endapan Kuarter, Pulau Rote, fasies radarRote Island is the southern part of Indonesia which was formed by two continental plates collision between Australia and Asia plates, so that there will be an uplift that forms the land until now. The Quaternary rock units are well exposed in the east-south part of Rote Island, which are composed of Alluvium and Coastal Deposits (Qa), Conglomerate Deposits (Qac), Coral Limestone (Ql), and Noele Formation (Qtn). This study provides lithological characteristics of quaternary deposit and possibility of ground water presence by using georadar data interpretation. This survey using Sirveyor 20 GPR equipment type with MLF antenna frequency 40 Mhz and Radan 5 as processing software. Result of radar facies identification showed geological condition at 15-30 depth was sandstone that can be compared to the Noele Formation (Qtn). At 2-15 meter depth is a layer composed of bioclastic limestone (coral limestone) which can be compared to Quaternary coral limestone (Ql). At 0-1 meter depth is Holocene deposit that can be compared to Alluvium and Coastal Deposit (Qa). The presence of ground water is estimated to be in the coral limestone layer at 12-15 meter depth.Keywords: Georadar, GPR, Quaternary deposit, Rote Island, radar facies

Characteristic of Shallow Subsurface Quaternary Sediment in Nongsa Isle, Part of Putri Islands, Batam, Based on Georadar Data Interpretation Undang Hernawan; Nineu Yayu Geurhaneu; Muhammad Zulfikar
BULLETIN OF THE MARINE GEOLOGY Vol 34, No 2 (2019)
Publisher : Marine Geological Institute of Indonesia

Nongsa Isle belongs to Putri Islands in Batam, is the outermost island that need to be protected either from natural hazards and anthropogenic factor. Therefore, this study was conducted by performing Ground Penetrating Radar analysis, in order to understand the geological condition particularly sedimentology and its process. We used Sirveyor 20 GPR equipment type with MLF antenna frequency 40 Mhz and Radan 5 as processing software, which include time zero correction, spatial filter, deconvolution, migration and adjustment of amplitude and signal gain. Data interpretation was conducted based on radar facies methodology that describes georadar image/radargram. The study result showed differences of sedimentary facies based on three differences of radar facies units, with the first layer (unit 1) is the youngest unit has thicknesses ranging from 3.5 – 5 m that characterized by parallel, strong reflector, high amplitude and continuous reflector configurations, unit 2 from 5 – 11 meter of depth, indicates parallel reflector pattern with medium-high amplitude and continuous, and unit 3 which is the oldest unit with thickness until penetration limit (11 – 20 m), characterized by a configuration of sub parallel – hummocky reflectors that are undulating, low-medium amplitude reflectors. Based on radar facies characteristics such as reflector configuration, reflection amplitude, and reflection continuity, the differencies of depositional facies are changes from fluvial – coastal plain.

DISTRIBUTION OF SUBSURFACE QUATERNARY SEDIMENT IN SOUTH BINTAN ISLAND WATERS AS A POTENTIAL HEAVY MINERAL PLACER OR RARE EARTH ELEMENT DEPOSIT BASED ON SEISMIC INTERPRETATION Muhammad Zulfikar; Nazar Nurdin; Noor Cahyo Dwi Aryanto; Ildrem Syafri; Budi Muljana; Andi Agus Nur
BULLETIN OF THE MARINE GEOLOGY Vol 36, No 1 (2021)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.36.1.2021.705

Bintan Island is one of the areas traversed by the Southeast Asian granitoid belt which is known to have the potential for heavy mineral placer deposits. Due to the dwindling presence of heavy mineral placer deposits in land areas, it is necessary to look for the potential presence of heavy mineral placer deposits in water areas. Searching for placer heavy mineral deposits accomodation in these waters requires subsurface mapping.The method used in this subsurface mapping is a single channel seismic method with a total of 179 lines in the direction of northeast – southwest and west – east. The results of this seismic recording are then interpreted the boundaries of the seismic facies unit and distributed using the kriging method. Furthermore, the thickness calculates by using the assumption velocity 1600 m/s.Based on the facies unit boundaries that have been interpreted, the quaternary sediments that formed in the study area are divided into 2 types of units, namely: Unit 2 which is estimated to be fluvial – transitional sediment, and Unit 1 which is estimated to be transitional sediment – shallow sea. There is also a difference in thickness patterns in these two units, where unit 2 shows a pattern of sediment thickening that resembles a paleochannel trending northeast – southwest, while unit 1 is relatively uniform.From the results of this study, it can be said that the area that has potential for heavy mineral placer deposits is in the west - center of the southern waters of Bintan Island. Where the potential for heavy mineral placer deposits should be in the paleochannel deposits that are part of Unit 2.

The Study of Seafloor Tin Placer Resources of Quaternary Sediment at Toboali Waters, South Bangka Muhammad Zulfikar; Noor CD Aryanto
BULLETIN OF THE MARINE GEOLOGY Vol 31, No 2 (2016)
Publisher : Marine Geological Institute of Indonesia

Bangka Island has primary and secondary tin deposit. However, along the history of tin mining has been done the primary tin deposit domination is less than secondary tin deposit. Secondary tin deposit is formed from Granitic S-type source rock weathering and then transported by gravity. After that, Cassiterite mineral (SnO2) accumulates and forms a placer deposit in the study area. The thickness of sediment cover at Toboali Waters is quite diverse, with a range between 5-20 milliseconds, by knowing the quarter sediment thickness using seismic data interpretation results, is expected to give an idea about tin placer deposit potential in Toboali waters. Based on the Isochron map shows patterns of quaternary sediment thickening to the southwest, south and southeast of Bangka Island.Keywords: Quaternary sediment, placer deposit, isochron map, Toboali WatersPulau Bangka memiliki endapan timah primer dan endapan timah sekunder. Namun, sepanjang sejarah penambangan timah yang telah dilakukan endapan timah primer tidak mendominasi jika dibandingkan dengan endapan timah sekunder. Pembentukan endapan timah sekunder berawal dari pelapukan batuan Granit tipe-S yang kemudian mengalami transportasi akibat adanya gravitasi. Setelah itu, mineral kasiterit (SnO2) terakumulasi dan membentuk endapan plaser di daerah penelitian. Ketebalan sedimen penutup di Perairan Toboali berkisar antara 5-20 milidetik, dengan mengetahui ketebalan sedimen kuarter berdasarkan interpretasi data hasil rekaman seismik diharapkan dapat memberikan gambaran tentang potensi endapan timah placer di Perairan Toboali. Berdasarkan atas peta isokron, memperlihatkan bahwa pola penebalan sedimen kuater ke arah baratdaya, selatan dan tenggara Pulau Bangka.Kata kunci : Sedimen kuarter, endapan placer, peta isokron, Perairan Toboali

Sebaran Granit Klabat Berdasarkan Interpretasi Seismik Saluran Tunggal Di Perairan Utara Tanjung Berikat Muhammad Zulfikar; Budi Muljana; Ildrem Sjafri
JURNAL GEOLOGI KELAUTAN Vol 20, No 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.20.1.2022.753

Perairan Tanjung Berikat merupakan salah satu perairan di daerah Pulau Bangka yang dilalui oleh jalur granit Asia Tenggara. Keberadaan jalur granit ini berhubungan erat dengan keterdapatan batuan granit yang berperan sebagai batuan sumber pembawa timah baik di daratan dan perairan. Namun demikian, keterdapatan Granit Klabat yang diketahui pada daerah Tanjung Berikat hanya batuan granit yang terlihat di darat saja. Sementara itu, jika melihat keterdapatan granit dalam bentuk singkapan maupun bongkah-bongkah pada wilayah pantai Tanjung Berikat dan sekitarnya, maka diduga adanya sebaran Granit Klabat ini menerus hingga ke arah laut. Metode yang digunakan ialah seismik saluran tunggal (single channel) dengan sumber suara berupa Boomer Single Plate dengan energi sebesar 400 Joule dan frekuensi 300 – 600 Hz. Dari rekaman seismik diinterpretasikan menjadi 4 (empat) unit dimana Unit-1, Unit-2, dan Unit-3 yang berada di atas basement akustik diduga berumur Kuarter. Basement akustik yang berumur Trias Awal kemudian diterobos oleh batuan yang diduga sebagai Granit Klabat. Selanjutnya dilakukan konturing menggunakan metode convergence interpolation. Hasil penelitian ini menunjukkan bahwa sebaran batuan Granit Klabat di daerah penelitian terlihat hingga area ±2,5 km dari garis pantai dengan kedalaman berkisar antara 20-80 milisecond pada bagian tengah-timur daerah penelitian dan 40-80 milisecond pada bagian barat daerah penelitian.

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