Identifikasi Struktur Bawah Permukaan Geologi Karangsambung Terhadap Terobosan Dyke dan Sill Menggunakan Metode Gaya Berat
DOI:
https://doi.org/10.26418/pf.v7i1.30499Abstract
Telah dilakukan penelitian tentang identifikasi struktur geologi daerah Karangsambung berdasarkan pengolahan data nilai gaya berat. Penelitian ini bertujuan untuk mengetahui gambaran struktur geologi bawah permukaan terhadap terobosan dyke dan sill. Hal ini terkait wilayah Karangsambung yang memiliki geologi kompleks yang memiliki peran sangat penting dalam ilmu kebumian terutama dapat dijadikan sebagai tempat pelatihan maupun penelitian geologi. Pada bidang geofisika metode gaya berat digunakan untuk memodelkan struktur bawah permukaan berdasarkan variasi densitas batuan di bawah permukaan. Nilai anomali gaya berat yang diinterpretasikan adalah nilai anomali gaya berat residual hasil upward continuation. Nilai densitas rata-rata yang digunakan adalah 2,76 g/cm3, diperoleh dari nilai densitas rata-rata batuan asal yang terdapat di daerah Karangsambung. Dari pemodelan struktur bawah permukaan menggunakan software Grav2dc, diperoleh struktur yang diduga sebagai dyke dengan jenis batuan basal (3,03 g/cm3) pada lintasan AA1 dan pada lintasan BB1 diperoleh struktur yang diduga sebagai dyke dengan jenis batuan andesit (2,54 g/cm3).
Kata Kunci : Metode gaya berat, Karangsambung, Dyke dan sill
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Date: 24-05-2023
Prisma Fisika
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