FAKTOR PENGONTROL KOMPOSISI MASERAL DAN MINERAL BATUBARA MARAH HALOQ- KALIMANTAN TIMUR
DOI:
https://doi.org/10.30556/jtmb.Vol8.No3.2012.786Kata Kunci:
faktor pengontrol, batubara, maseral, mineralAbstrak
Beberapa percontoh batubara dari daerah Marah Haloq-Kalimantan Timur diambil untuk pengujian kandungan maseral dan mineralnya berdasarkan pada standar ASTM (2009). Batubara ini termasuk dalam Formasi Wahau berumur Oligosen Atas-Miosen Bawah dalam Cekungan Kutai, dengan lingkungan pengendapan laut dangkal-darat. Litotipe batubara ini didominasi oleh klarain dan vitrain. Vitrinit merupakan maseral utama dalam batubara ini, diikuti oleh liptinit dan inertinit. Mineral lempung dan kuarsa merupakan mineral utama, diikuti oleh pirit dan kalsit. Peringkat batubara ini adalah sub- bituminus C berdasarkan klasifikasi ASTM (2009). Faktor pengontrol komposisi maseral dan mineral batubara ini adalah lingkungan pengendapannya. Inkursi air laut ke darat mengakibatkan genangan air di rawa-rawa dalam suasana reduksi. Rawa-rawa seperti ini menghasilkan litotipe klarain dan vitrain, dominansi vitrinit terhadap liptinit dan inertinit. Pirit dan kalsit yang berasal dari laut mengisi celah-celah dan rekahan-rekahan pada batubara. Kedua mineral ini dikategorikan sebagai mineral epigenetik. Peringkat batubara tergolong rendah, yakni subbituminus C. Di daerah penelitian terdapat intrusi andesitik, namun kehadirannya tidak menyentuh batubara, sehingga peringkat tetap rendah.
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