KARAKTERISTIK PETROGRAFIS BATUBARA SEBATIK-KALIMANTAN TIMUR BERDASARKAN ASPEK GEOLOGISNYA
DOI:
https://doi.org/10.30556/jtmb.Vol8.No2.2012.794Kata Kunci:
batubara, tipe, peringkat, aspek geologisAbstrak
Studi petrografi batubara ini dilakukan terhadap beberapa percontoh yang diambil dari daerah Sebatik, Kalimantan Timur. Seluruh percontoh batubara ini dianalisis secara petrografis berdasarkan metodologi yang diterapkan oleh ASTM (2009). Komposisi petrografis batubara Sebatik mengindikasikan konsistensi kandungan maseral dan mineralnya. Batubara ini berciri khas dengan dominasi vitrinit terhadap liptinit, inertinit dan mineral. Tipe batubara seperti ini mengindikasikan bahwa batubara ini terbentuk dari tetumbuhan hutan di zona tropis yang lembab dengan sedikit sekali mengalami musim kering, dengan lingkungan pengendapan laut dangkal-paralik-fluvial.
Peringkat batubara Sebatik memperlihatkan sedikit perbedaan, yakni lignit dan subbituminus A. Hal ini disebabkan oleh efek intrusi andesit yang terjadi di daerah sekitarnya. Tipe dan peringkat batubara ini terkait dengan aspek-aspek geologis yang memengaruhinya, seperti: lingkungan pengendapan, intrusi dan umur geologis.
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