KARAKTERISTIK DAN GENESA PENGAYAAN UNSUR-UNSUR TANAH JARANG PADA BATUBARA LAPANGAN BATUBARA MUARA TIGA BESAR UTARA, TANJUNG ENIM, CEKUNGAN SUMATERA SELATAN

Ferian Anggara; Mutiara Cikasimi; Basuki Rahmat; Sigit Arso Wibisono; Rita Susilawati

doi:10.47599/bsdg.v14i3.288

Penulis

Ferian Anggara Fakultas Tehnik Universitas Gadjah Mada, Departemen Tehnik Geologi Universitas Gajah Mada Penulis
Mutiara Cikasimi Departemen Teknik Geologi Fakultas Teknik Universitas Gadjah Mada Penulis
Basuki Rahmat Pusat Sumber Daya Mineral Batubara dan Panas Bumi Penulis
Sigit Arso Wibisono Pusat Sumber Daya Mineral Batubara dan Panas Bumi Penulis
Rita Susilawati Pusat Sumber Daya Mineral Batubara dan Panas Bumi Penulis

DOI:

https://doi.org/10.47599/bsdg.v14i3.288

Abstrak

Batubara telah menjadi salah satu sumber alternatif unsur-unsur tanah jarang (UTJ) seiring dengan meningkatnya permintaan terhadap kebutuhan unsur-unsur tersebut. Kondisi geologis spesifik menyebabkan pengayaan konsentrasi UTJ pada batubara. Keterdapatan lapisan tipis material vulkanik (tonstein) pada Lapangan Batubara Muara Tiga Besar Utara, Formasi Muara Enim, Cekungan Sumatera Selatan menjadi salah satu indikasi terdapatnya pengayaan UTJ. Penelitian dilakukan menggunakan metode petrografi sayatan poles, analisis-analisis X-Ray Diffraction (XRD), proksimat, dan geokimia; Inductively Coupled Plasma-Mass/Atomic Emission Spectroscopy (ICP-MS/AES). Analisis geokimia menunjukkan pola distribusi UTJ didominasi oleh tipe UTJ Berat (Heavy Rare Earth Elements, HREE). Plot diagram nilai C_outl dan REO_ash menunjukkan prospek pengayaan UTJ termasuk ke dalam daerah prospek. Pola distribusi UTJ dan anomali redox sensitive dan redox non-sensitive menunjukkan tipe genetik pengayaan UTJ adalah tufaan. Pengayaan UTJ terjadi oleh proses pencucian alkaline tonstein yang terendapkan pada fase penggambutan dalam pembentukan batubara.

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