Analisis Geokimia dan Pengukuran Parameter Magnetik untuk Identifikasi Unsur Mineral Kritis dan Karakteristik Endapan Lumpur pada Wilayah Timur Laut Gunung Lumpur Sidoarjo

Kurniawan, Akbar Dwi (2023) Analisis Geokimia dan Pengukuran Parameter Magnetik untuk Identifikasi Unsur Mineral Kritis dan Karakteristik Endapan Lumpur pada Wilayah Timur Laut Gunung Lumpur Sidoarjo. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Endapan lumpur pada gunung lumpur Sidoarjo (LUSI) yang telah terakumulasi selama 17 tahun sejak pertama kali erupsi pada tahun 2006 membuat LUSI menarik untuk dijadikan target penelitian, salah satunya mengenai karakteristik endapan lumpur dan potensi mineral kritis yang terkandung di dalamnya. Fokus penelitian ini adalah mengidentifikasi karakteristik endapan lumpur LUSI berdasarkan nilai parameter magnetik dan mineralogi serta mengetahui kandungan mineral kritis pada sampel LUSI dan persebarannya. Sampel endapan diambil pada bagian timur laut wilayah LUSI. Metode yang digunakan adalah pengukuran suseptibilitas magnetik, XRD, dan ICP-MS yang kemudian dilakukan korelasi Pearson untuk menghubungkan antar parameter. Hasil nilai suseptibilitas magnetik χLF endapan lumpur memiliki rentang (0,14 - 1,55)×10-6 m3/kg dan didominasi oleh nilai χFD sedang (2-10%) menunjukkan bahwa sumber partikel magnetik endapan lumpur diduga berasal dari proses pedogenesis batuan sedimen dengan mineral yang terdeteksi mengindikasikan endapan lumpur berasal dari Formasi Kalibeng Atas yang terbentuk pada lingkugan pengendapan laut. Kandungan mineral kritis yang terdeteksi berupa unsur Disporsium (rata-rata 4,07 ppm), Neodimium (rata-rata 25,13 ppm), Praseodimium (rata-rata 6,39 ppm), Skandium (rata-rata 17,79 ppm), Samarium (rata-rata 5,18 ppm), dan Iterbium (rata-rata 16,61 ppm). Secara keseluruhan pola persebaran nilai suseptibilitas magnetik dan unsur mineral kritis terlihat tidak saling terkait antar variasi kedalaman yang disebabkan oleh rekayasa aliran semburan oleh pihak PPLS. Selain itu, hasil korelasi dengan nilai ≤ 0,4 menunjukkan hubungan yang cenderung lemah antara nilai suseptibilitas magnetik terhadap parameter geokimia yang terukur
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The mud deposits on Sidoarjo mud vulcano which have accumulated for 17 years since its first eruption in 2006 have potential as research material, one of which is regarding the characteristics of the mud deposits and the potential of critical raw minerals (CRM’s) contained within it. The focus of this research is to identify the characteristics of the LUSI mud deposits based on magnetic and mineralogical parameter values and to determine the CRM’s content in the LUSI samples and their distribution. The methods used are the measurement of magnetic susceptibility, XRD, and ICP-MS then performed Pearson correlation to find the relationship between parameters. The results of the χLF value of mud deposits have a range (0,14 - 1,55)×10-6 m3/kg and are dominated by moderate χFD values (2-10%) shows that the source of the magnetic particles is assumed to originate from the pedogenesis process of sedimentary rocks with detected minerals indicating that the mud deposits originate from the Upper Kalibeng Formation which was formed in marine depositional environment. The CRM’s content detected are Dysporsium (average 4.07 ppm), Neodymium (average 25.13 ppm), Praseodymium (average 6.39 ppm), Scandium (average 17.79 ppm), Samarium (average 5.18 ppm), and Ytterbium (average 16.61 ppm). Overall, the distribution pattern of magnetic susceptibility values and CRM’s appears to be independent of each other with variations in depth caused by manipulation of mud flow by the PPLS. In addition, result value of the correlation is ≤ 4 show a relatively weak relationship between magnetic susceptibility values and measured geochemical parameters.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Gunung Lumpur, ICP-MS, Mineral Kritis, Suseptibilitas Magnetik; XRD, Mud Vulcano, ICP-MS, Critical Raw Mineral, Magnetic Susceptibility, XRD
Subjects:	Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas T Technology > TA Engineering (General). Civil engineering (General) > TA417.3 Magnetic testing.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Akbar Dwi Kurniawan
Date Deposited:	23 Aug 2023 05:38
Last Modified:	23 Aug 2023 05:38
URI:	http://repository.its.ac.id/id/eprint/103336

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