Karakterisasi Sifat Magnetik Dan Sifat Listrik Endapan Sinter di Beberapa Sumber Mata Air Panas Sumatera Barat (Studi Kasus: Mata Air Panas Alam Pauh Duo Kabupaten Solok Selatan, Sumani Kabupaten Solok dan Bonjol Kabupaten Pasaman Sumatera Barat)
DOI:
https://doi.org/10.25077/jfu.6.2.119-125.2017Abstract
Telah dilakukan karakterisasi sifat magnetik dan sifat listrik endapan sinter mata air panas dari mata air panas Sapan Malulung Kabupaten Solok Selatan, Sumani Kabupaten Solok dan Bonjol Kabupaten Pasaman. Pengukuran resistivitas listrik dilakukan dengan metode dual probe electrode dan suseptibilitas magnetik dengan menggunakan metode anisotropy of magnetic susceptibility (AMS). Nilai suseptibilitas magnetik yang didapatkan dari seluruh endapan sampel adalah 6 x 10-8 m3/kg – 15 x 10-8 m3/kg. Diperkirakan mineral magnetik yang berkontribusi di dalam nilai suseptibilitas magnetik adalah hematit. Rendahnya nilai suseptibilitas magnetik di dalam endapan sinter dikarenakan oleh jumlah mineral magnetik (hematit) yang terkandung di dalam endapan sinter. Nilai resistivitas listrik tidak jenuh air didapatkan pada kisaran 35,632 Ωm dan 2509,569 Ωm. Besarnya rentang nilai resistivitas listrik yang didapatkan karena ketiadaan mineral konduktif di dalam endapan sinter. Nilai resistivitas listrik jenuh air didapatkan pada kisaran 6,829 Ωm sampai 49,333 Ωm. Tingginya nilai resistivitas listrik ini dikarenakan terdapatnya material-material pengotor yang tidak berasal dari reservoir panas bumi. Nilai suseptibilitas magnetik endapan sampel pada ketiga lokasi meningkat terhadap penurunan temperatur permukaan atau bila menjauhi mata air panas, sedangkan resistivitas listrik memiliki bentuk perubahan yang acak terhadap penurunan temperatur.
Kata kunci: endapan sinter mata air panas, resistivitas listrik, suseptibilitas magnetik, panas bumi
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