INVESTIGASI KEBERADAAN DAN KETERKAITAN UNSUR KELUMIT PADA BATUBARA FORMASI MANUMBAR PIT Y-2 DI CEKUNGAN KUTAI, KALIMANTAN TIMUR

Akhmad Khahlil Gibran; Ezza Ray Raditya Prasetyo; Eko Bayu Purwasatriya; Didik Jati Mulyanto

doi:10.30556/jtmb.Vol21.No1.2025.1481

Penulis

Akhmad Khahlil Gibran Jurusan Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman http://orcid.org/0000-0002-5453-9496
Prasetyo PT Timah
Eko Bayu Purwasatriya Jurusan Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman
Didik Jati Mulyanto PT. Indexim Coalindo, Sahid Sudirman Centre, Kota Jakarta Pusat

DOI:

https://doi.org/10.30556/jtmb.Vol21.No1.2025.1481

Kata Kunci:

cekungan Kutai, kemostratigrafi, kadar sulfur, kandungan abu, unsur kelumit

Abstrak

Cekungan Kutai yang terkenal sebagai cekungan penghasil batubara merupakan salah satu cekungan terbesar di Indonesia. Batubara terdiri dari beberapa unsur penyusun antara lain unsur primer, unsur kelumit, maseral, mineral pengotor, dan komponen lainnya. Penelitian ini bertujuan untuk melakukan penyelidikan rinci terhadap komposisi unsur batubara, dengan fokus khusus pada unsur kelumit. Tujuan dari penelitian ini adalah untuk mengetahui sifat unsur, potensi, dan konsentrasi unsur kelumit dalam batubara, serta hubungannya dengan nilai total sulfur dan kandungan abu. Pemeriksaan menggunakan ICP-OES (Induktif Coupled Plasma – Optical Emission Spectrometer), dilakukan terhadap 11 lapisan batubara PIT Y-2 untuk menilai keberadaan unsur kelumit, unsur utama, nilai total sulfur, dan kandungan abu. Temuan penelitian menjelaskan bahwa distribusi dan konsentrasi elemen kelumit pada grafik analisis kemostratigrafi dikategorikan menjadi lima fitur berbeda, yang kemudian direpresentasikan sebagai kemozon. Selain itu, diketahui bahwa kemozon 3 menunjukkan potensi paling besar, karena semua elemen mengalami pengkayaan substansial di area ini dengan total 304,88 ppm di sampel pada seam E18U1. Telah diketahui bahwa beberapa elemen menunjukkan korelasi dengan fluktuasi keseluruhan konsentrasi sulfur dan abu yang ditemukan dalam batubara. Unsur kelumit Cd, Mn, dan Pb memiliki korelasi positif dengan variasi kadar total sulfur, sedangkan Cr, Cu, Pb, dan V berhubungan dengan korelasi positif terhadap perubahan nilai kandungan abu. Studi ini meningkatkan pemahaman kita mengenai distribusi spasial dan kelimpahan unsur kelumit dalam batubara dari wilayah penghasil batubara terbesar di Indonesia. Data ini dapat dimanfaatkan untuk membangun model geokimia dan stratigrafi yang lebih tepat dalam penelitian selanjutnya.

Biografi Penulis

Akhmad Khahlil Gibran, Jurusan Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman

Jurusan Teknik Geologi, Dosen dan Peneliti

Prasetyo, PT Timah

Eko Bayu Purwasatriya, Jurusan Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman

Didik Jati Mulyanto, PT. Indexim Coalindo, Sahid Sudirman Centre, Kota Jakarta Pusat

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