Identifikasi Logam Tanah Jarang di Kabupaten Belitung Berdasarkan Korelasi Metode Geolistrik Resistivitas 2D dan Time Domain Induced Polarization Terhadap Uji XRF

Afianti, Fatin (2024) Identifikasi Logam Tanah Jarang di Kabupaten Belitung Berdasarkan Korelasi Metode Geolistrik Resistivitas 2D dan Time Domain Induced Polarization Terhadap Uji XRF. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Logam Tanah Jarang (LTJ) merupakan salah satu dari mineral strategis dan kritis yang terdiri dari kumpulan unsur kelompok Lantanida dan logam transisi yaitu Sc dan Y. Melihat dari sisi keberagaman alam dan kebutuhan global akan sumber daya LTJ, Indonesia memiliki potensi untuk mengembangkan sektor eksploitasi sumber daya LTJ. Maka dari itu, dilakukan eksplorasi secara intensif dan masif. Penelitian ini bertujuan untuk menentukan identifikasi logam tanah jarang di daerah penelitian berdasarkan korelasi metode resistivitas 2D dan Induced Polarization terhadap uji geokimia. Konfigurasi yang digunakan pada metode geolistrik adalah konfigurasi dipole-dipole dengan spasi 6 meter. Sementara inversi yang digunakan pada pengolahan 2D geolistrik adalah inversi robust. Hasil penelitian menunjukkan bahwa litologi daerah penelitian terdiri dari lapisan pedolith (pasir lempungan dan lempung pasiran) dengan resistivitas < 1.000 Ωm, lapisan saprolith (granit lapuk) dengan resistivitas 1.000 – 3.600 Ωm dan lapisan bedrock (granit fresh) dengan resistivitas > 3.600 Ωm. Dari hasil IP, daerah penelitian didominasi nilai chargeabilitas rendah. Konsentrasi LTJ tertinggi berada di daerah tenggara penelitian (satuan batuan granit lapuk) dengan konsentrasi LTJ ringan lebih banyak dibandingkan LTJ berat. Keberadaan LTJ pada lapisan pedolith berada di resistivitas tinggi yaitu pada rentang 334.03 – 1.166 Ωm. serta pada range chargeability rendah yaitu 0,74293– 90,117 msec. Anomali resistivitas tinggi dan chargeability rendah menandakan adanya mineral non-konduktif seperti monasit dan xenotime. Korelasi kadar LTJ dengan resistivitas menunjukkan korelasi positif sedangkan kadar LTJ terhadap chargeability tidak menunjukkan korelasi.
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Rare Earth Elements (REE) are one of the strategic and critical minerals consisting of a collection of elements from the Lanthanide group and transition metals, namely Sc and Y. Looking at the natural diversity and global need for REE resources, Indonesia has the potential to develop the resource exploitation REE. Therefore, intensive and massive exploration was carried out. This research aims to determine the identification of rare earth metals in the research area based on the correlation of 2D resistivity and Induced Polarization methods with geochemical tests. The configuration used in the geoelectric method is a dipole-dipole configuration with a spacing of 6 meters. Meanwhile, the inversion used in 2D geoelectric processing is robust inversion. The research results show that the lithology of the research area consists of a pedolith layer (clay sand and sandy clay) with a resistivity < 1.000 Ωm, a saprolith layer (weathered granite) with a resistivity of 1.000 – 3.600 Ωm and a bedrock layer (fresh granite) with a resistivity > 3.600 Ωm. From the IP results, the research area is dominated by low chargeability values. The highest concentration of REEs is in the southeastern research area (weathered granite rock unit) with a higher concentration of light REEs than heavy REEs. The existence of REE in the pedolith layer is in high resistivity, namely in the range 334,03 – 1.166 Ωm. and in the low chargeability range, namely 0,74293– 90,117 msec. Anomalies of high resistivity and low chargeability indicate the presence of non-conductive minerals such as monazite and xenotime. The correlation between REE content and resistivity shows a positive correlation, while REE content and chargeability does not show a correlation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	logam tanah jarang, Induced Polarization (IP), resistivitas, XRF, rare earth elements, Induced Polarization (IP), resistivity, XRF
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods T Technology > TN Mining engineering. Metallurgy > TN689+ Physical metallurgy
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Fatin Afianti
Date Deposited:	08 Aug 2024 01:26
Last Modified:	08 Aug 2024 01:26
URI:	http://repository.its.ac.id/id/eprint/110720

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