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

DOI: http://dx.doi.org/10.32693/jgk.18.2.2020.619

Abstract


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 radar


Rote 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


Keywords


georadar; GPR; Endapan Kuarter; Rote

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DOI: http://dx.doi.org/10.32693/jgk.18.2.2020.619

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