Identifikasi Zona Reservoir Panas Bumi Gunung Ijen Jawa Timur Berdasarkan Pemodelan 2 Dimensi Anomali Geomagnetik
DOI:
https://doi.org/10.26418/positron.v12i1.49130Keywords:
Sistem panas bumi, zona reservoar, suseptibilitasAbstract
Komplek Gunung api Ijen merupakan prospek panas bumi yang terletak di Kabupaten Bondowoso, Jawa Timur. Sistem panas bumi Gunung api Ijen ditandai oleh kawah danau berfluida asam dan solfatara bertemperatur tinggi. Beberapa batuan teralterasi di dekat Gunung Kukusan dan sekelompok mata air panas Blawan di bagian utara kaldera. Pengukuran magnetik dilakukan pada 175 titik tersebar di dalam kaldera melingkupi kawah Gunung Ijen hingga Gunung Merapi. Anomali intensitas magnetik total diperoleh melalui koreksi standard IGRF dan variasi diurnal. Metode reduksi ke kutub (RTP) diterapkan dengan inklinasi geomagnet sekitar -32 °. Secara umum, hasil penelitian menunjukkan bahwa anomali magnetik tinggi berasosiasi dengan jalur patahan yang menghasilkan pembentukan gunung api baru di bagian selatan, Sedangkan anomali magnetik rendah berada berdekatan dengan kawah Ijen dan Gunung Merapi di bagian timur. Anomali yang rendah ditafsirkan oleh dua kemungkinan pengaruh demagnetisasi batuan akibat kontak termal atau pengaruh remanen batuan dengan umur geologi tertentu menghasilkan polaritas reversal. Anomali intensitas magnet total tinggi pada komponen regional berada 50 hingga 114 nT dan anomali rendah berada di kisaran -850 hingga "“750 nT, hal ini ditafsirkan bahwa potensi batuan panas di Komplek Gunung api Ijen tersebar sesuai keberadaan kaldera dan jalur gunung api muda. Prospek batuan panas berkorelasi dengan Formasi batuan gunung api muda dan intrusi magmatic hasil proses pembentukan gunung api berumur Kuarter.References
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