IDENTIFIKASI KANDUNGAN LITIUM PADA BATUAN FILIT KOMPLEKS LUK ULO, JAWA TENGAH

LITHIUM IDENTIFICATION ON PHYLLITE FROM THE LUK ULO COMPLEX, CENTRAL JAVA

  • Isyqi Badan Riset dan Inovasi Nasional
  • Nugroho Imam Setiawan Universitas Gadjah Mada
  • Ferian Anggara Universitas Gadjah Mada
Kata Kunci: Litium, Filit, Kompleks Luk Ulo, ICP AES/MS, Mika Putih

Abstrak

Produksi baterai litium-ion di Indonesia akan lebih praktis jika Indonesia juga memiliki cadangan litium. Batuan metapelitik dapat menjadi salah satu material alternatif penghasil litium yang cukup potensial. Batuan filit yang  termasuk dalam batuan metapelitik ditemukan tersingkap di Kompleks Luk Ulo, Jawa Tengah. Penelitian ini bertujuan untuk mengidentifikasi kandungan litium dan mineralogi batuan filit Kompleks Luk Ulo sebagai model analogi keterdapatan litium pada batuan sejenis. Metode yang digunakan meliputi survei lapangan, analisis petrografi, analisis XRD, dan analisis ICP AES/MS. Filit Kompleks Luk Ulo tersingkap pada beberapa lokasi, memiliki skitositas yang berkembang cukup baik dengan komposisi mineral utama berupa kuarsa, grafit, klorit, dan mika putih. Litium dalam filit Komplek Luk Ulo memiliki konsentrasi yang lebih tinggi dibandingkan konsentrasi rata-rata litium dalam kerak bumi yaitu merentang antara 18,2 ppm sampai dengan 84,7 ppm. Kandungan litium dalam batuan tersebut diinterpretasikan berkaitan dengan mineral mika putih karena litium dalam batuan filit berkorelasi positif dengan unsur-unsur pembentuk mineral mika putih yaitu unsur utama K2O, CaO, Na2O, MgO, dan Al2O3. Pengkayaan litium dalam batuan filit Kompleks Luk Ulo mencapai lima kali dibanding konsentrasi litium dalam kerak bumi. Sumber pengkayaan tersebut diperkirakan berasal dari protolith filit berupa batuan sedimen pelitik asal benua. Kandungan litium dalam batuan filit Kompleks Luk Ulo memungkinkan batuan tersebut menjadi bahan baku sumber litium, namun batuan tersebut tidak untuk dieksploitasi karena terletak di Kawasan Cagar Alam Geologi Karangsambung.

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Diterbitkan
2024-10-01
Bagian
Buletin Sumber Daya Geologi