KARAKTERISTIK GEOKIMIA MANIFESTASI PANAS BUMI DAERAH SAMPURAGA, KABUPATEN MANDAILING NATAL, SUMATERA UTARA
Abstract
Penyelidikan dilakukan di daerah Sampuraga, Kabupaten Mandailing Natal, Provinsi Sumatera Utara. Oidaerah tersebut ditemukan dua sumber mata air panas berdekatan dengan derajat keasaman (pH) yang
berbeda. Penyelidikan yang dilakukan meliputi pengukuran pH, suhu, debit, daya hantar listrik, dan luas
manisfestasi mata air panas. Oilakukan juga analisis geokimia air seperti anion, kation, dan isotop
terhadap conto lapangan di laboratorium serta membandingkan reaksi kimia yang terjadi antara air panas
ber-pH asam dengan netral.
Oari beberapa mata air panas bertemperatur tinggi yang ada di Sampuraga, suhu tertinggi terdapat di
lokasi Sampuraga 2 yaitu 100,8°C.pH air panas di lokasi ini berkisar dari asam sampai netral dengan
debit cukup besar (1- 41/detik). pH dan temperatur berperan dalam mekanisme reaksi kimia yang terjadi.
Berdasarkan pendugaan geotermometer air NaK didapatkan perkiraan temperatur reservoir sebesar
233°Cyang termasuk ke dalamtemperaturtinggi.
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