Identifikasi Struktur Lapisan Bawah Permukaan Daerah Potensial Mineral dengan Menggunakan Metode Gravitasi di Lapangan “A”, Pongkor, Jawa Barat

Wachidah, Nurin (2017) Identifikasi Struktur Lapisan Bawah Permukaan Daerah Potensial Mineral dengan Menggunakan Metode Gravitasi di Lapangan “A”, Pongkor, Jawa Barat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia memiliki banyak potensi tambang mineralsehingga memerlukan survey dan analisis agar dapat memanfaatkan potensi tersebut. Salah satu metode yang dapat digunakan adalah dengan menggunakan metode geofisika. Oleh karena dilakukan penelitian menggunakan metode gravitasi di daerah Pongkor, Jawa Barat. Pengambilan data gravitasi dilakukan pada 23 Maret hingga 27 Mei Juli 2013 menggunakanalat gravitimeter SCINTREX AUTOGRAV CG-5 dengan 193 titik pengukuran. Anomali Bouguer Lengkap di topografi direduksi ke bidang datarmenggunakan metode Dampney. Kemudian dilakukanpemisahan anomali regional dan residual dengan menggunakan metode kontinuasi ke atas pada ketinggian 300 meter. Pemodelan 2,5D dilakukan pada dataanomali residual berdasarkan informasi geologi dan analisa struktur denganmenggunakan FHD (First Horizontal Derivative) dan SVD (Second VerticalDerivative) untuk menentukan batas struktur geologi.Hasil pemodelan menunjukkan potensi mineralisasi dengantipe pengendapan epitermal sulfidasi rendah. Berdasarkan hasil tersebut terdapat 5lapisan penyusun daerah penelitian yang terdiri dari breksi tuf (2,55 gr/cm3), tuflapili (2,40 gr/cm3), tuf (2,30 gr/cm3), dan breksi dasit (2,65 gr/cm3), juga terdapatintrusi berupa andesit (2,85 gr/cm3).=============== Indonesia has a lot of mineral potential so it needs survey and analysis in order to exploit that potential. A method which can be used to this is gravity method. Therefore gravity method research has beenheld in Pongkor, West Java. Data acquisition had been conducted at March, 23rd – May, 27th 2013 using SCINTREX AUTOGRAV CG-5.Complete Bouguer Anomaly in topography was reducted to plane usingmethod by Dampney. Then the data was filtered using upwardcontinuation in 300 meters to separate regional and residual anomalies. 2,5D models were made from residual anomaly will be corelated with geologicalinformation and structural analysis with FHD (First Horizontal Derivative) and SVD (Second Vertical Derivative) analysis to estimate fault interface.The results show potential for mineralization in typical lowsulphidation epithermal deposit. There were five rock layers in this area, these rocksare tuff breccia (2.55 gr/cm3), lapilli tuff (2.40 gr/cm3), tuff (2.30 gr/cm3), and dacitebreccia (2.65 gr/cm3), and there was intrusion of andesite (2.85gr/cm3).

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: gravitasi; FHD; SVD; gravity
Subjects: Q Science > QE Geology > QE601 Geology, Structural
Divisions: Faculty of Mathematics and Science > Physics > (S1) Undergraduate Theses
Depositing User: Nurin Wachidah
Date Deposited: 19 Mar 2018 06:47
Last Modified: 19 Mar 2018 06:47
URI: http://repository.its.ac.id/id/eprint/50171

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