POLA ALIRAN PANAS BERDASARKAN ANALISIS FLUIDA DAN MINERAL UBAHAN DI DAERAH PANAS BUMI SORIK MARAPI, KABUPATEN MANDAILING NATAL, PROVINSI SUMATRA UTARA

HEAT FLOW PATTERN BASED ON ANALYSIS OF GEOTHERMAL FLUID AND ALTERATION MINERAL IN SORIK MARAPI REGION, MANDAILING NATAL DISTRICT, NORTH SUMATRA PROVINCE

  • Hisyam Azhar Azizi Universitas Padjadjaran
  • Agus Didit Haryanto Universitas Padjadjaran
  • Johanes Hutabarat Universitas Padjadjaran
  • Dicky Muslim Universitas Padjadjaran
  • Dewi Gentana Universitas Padjadjaran
  • Ryan Hidayat KS Orka Renewables Pte Ltd.
Kata Kunci: Sorik Marapi, geokimia, panas bumi, zona alterasi, upflow, outflow

Abstrak

Daerah panas bumi Sorik Marapi di Kabupaten Mandailing Natal, Provinsi Sumatra Utara merupakan sistem panas bumi bertemperatur tinggi yang diduga dari karakteristik kimia air panas yang muncul di permukaan. Kehadiran mineral ubahan seperti epidot pada serbuk bor sumur eksplorasi memperkuat pendugaan temperatur reservoir yang mencapai 235⁰C. Karakteristik air panas bersifat lebih asam di sekitar fumarol dan mineral ubahan yang didapatkan dari sumur bor mencerminkan zona upflow sedangkan kelompok mata air panas berupa air klorida ber pH netral di sebelah utara dengan elevasi yang lebih rendah mencerminkan zona outflow sistem panas bumi di sini. Hal ini merupakan ciri khas aliran fluida panas yang terjadi di daerah panas bumi sistem vulkanik dengan morfologi terjal (steep terrain volcanic system) seperti halnya daerah Sorik Marapi.

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2020-12-01
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Buletin Sumber Daya Geologi