Identifikasi Struktur Bawah Permukaan Cekungan Pembuang Daerah Kalimantan Tengah Berdasarkan Data Gaya Berat

Authors

  • Rika Kurniasih Univeristas Tanjungpura
  • Yudha Arman Universitas Tanjungpura
  • Radhitya Perdhana Universitas Tanjungpura

DOI:

https://doi.org/10.26418/pf.v10i1.52209

Abstract

Data anomali gaya berat Free Air Anomaly (FAA) yang diperoleh dari satelit Topex digunakan untuk mengetahui struktur bawah permukaan Cekungan Pembuang di daerah Kabupaten Seruyan Kalimantan Tengah. Koreksi Bouguer dan koreksi terrain (medan) diterapkan pada data tersebut untuk mendapatkan anomali Bouguer lengkap. Anomali regional dan anomali residual dipilah menggunakan tapis Butterworth. Pemodelan dilakukan pada anomali regional untuk mendapatkan struktur bawah permukaan cekungan Pembuang. Hasil pemodelan menunjukkan terdapatnya 4 lapisan batuan, yang terdiri dari dua lapisan batuan dasar dan dua lapisan teratas. Lapisan dasar diduga merupakan intrusi kapur dan metamorf pra-tersier yang terdiri dari batuan granit dan batuan kuarsit, dengan densitas rata-rata 2,6 g/cm3 dan 2,8 g/cm3, sedangkan dua lapisan teratas diduga merupakan sedimen kuarter dan sedimen tersier, dengan densitas rata-rata 1,98 g/cm3 dan 2 g/cm3. Model yang dibuat menunjukkan adanya terobosan batuan basement (dasar) berupa granit, serta sesar normal dan sesar naik. Densitas rata-rata batuan di daerah penelitian sebesar 2,4 g/cm3.

Author Biographies

Rika Kurniasih, Univeristas Tanjungpura

Program Studi Geofisika

Yudha Arman, Universitas Tanjungpura

Program Studi Geofisika

Radhitya Perdhana, Universitas Tanjungpura

Program Studi Geofisika

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Published

2022-06-05

Issue

Vol. 10 No. 1 (2022)

Section

Articles

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Date: 24-05-2023

Prisma Fisika
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