KARAKTERISTIK DAN LINGKUNGAN PENGENDAPAN BATUBARA BERDASARKAN ANALISIS PETROGRAFI ORGANIK, DAERAH JONGGON, KABUPATEN KUTAI KARTANEGARA, PROVINSI KALIMANTAN TIMUR
Abstract
Karakteristik (peringkat dan tipe) serta lingkungan pengendapan batubara di daerah Jonggon dan sekitarnya diteliti dengan menggunakan metode petrografi batubara (analisis reflektansi vitrinit dan komposisi maseral). Analisis dilakulan terhadap 13 conto batubara formasi Balikpapan. Secara megaskopis batubara berwarna hitam, keras, goresan hitam, agak kusam, pecahan blocky, terdapat getah damar, ketebalan berkisar 0,40 m s.d. 3,30 m. Analisis reflektansi vitrinit (Rv) menunjukkan bahwa batubara di daerah penelitian memiliki nilai Rv berkisar antara 0,25% s.d. 0,45% sehingga dapat diklasifikasikan pada peringkat lignit - subbituminous. Secara mikroskopis, analisis komposisi maseral menunjukan bahwa tipe batubara di daerah penelitian didominasi oleh kelompok maseral huminit (67,60% s.d. 95,80%), diikuti oleh maseral inertinit (1,20 s.d. 26,40%) serta sebagian kecil maseral liptinit (0,20% s.d. 5,60%). Lebih jauh, hasil analisis komposisi maseral melalui nilai Tissue Preservation Index (TPI), Gelification Index (GI), dan Ground Water Index (GWI) mengindikasikan bahwa material organik pembentuk batubara di daerah penelitian didominasi oleh tumbuhan berkayu yang mengalami tingkat oksidasi rendah serta terendapkan pada lingkungan telmatik.
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