Mineral Chemistry and The Stability Temperature of Nickel-Iron Sulfide from Kolaka Ultramafic Rocks, Southeast Sulawesi

Rio Irhan Mais Cendra Jaya; Syahrul Syahrul; Masri Masri

doi:10.56099/ophi.v7i1.p1-6

Penulis

Rio Irhan Mais Cendra Jaya Teknik Geologi Universitas Halu Oleo, Kendari, Indonesia https://orcid.org/0009-0000-4963-4213
Syahrul Syahrul Teknik Pertambangan, Universitas Sembilanbelas November Kolaka, Indonesia
Masri Masri Teknik Geologi Universitas Halu Oleo, Kedari, Indonesia https://orcid.org/0000-0001-6551-5150

DOI:

https://doi.org/10.56099/ophi.v7i1.p1-6

Kata Kunci:

ultramafic rocks, mineral chemistry, pentlandite, nickel, stability diagram

Abstrak

Penelitian ini menginvestigasi kimia mineral dan stabilitas sulfida nikel-besi batuan ultramafik di wilayah Kolaka, Sulawesi Tenggara, Indonesia. Pengambilan sampel dilakukan pada singkapan batuan ultramafik di Kecamatan Baula dan Wolo. Batuan ultramafik Kolaka terdiri dari lerzolit, harzburgit, olivin websterit, dan serpentinit. Mineral sulfida, seperti pentlandit, pirit, dan kalkopirit, teramati pada batuan ini, bersama dengan mineral kaya Ni-Fe yakni awaruite. Pentlandite, mineral sulfida yang dominan, menggantikan olivin dan kromit, terutama pada bagian tepi dan urat-urat serpentin. Delapan sayatan poles batuan ultramafik dari kedua lokasi dianalisis dengan menggunakan SEM-EDS untuk mengetahui komposisi kimia pentlandit. Analisis ini menunjukkan komposisi Ni dan Fe yang bervariasi, dengan kandungan Ni yang lebih banyak. Pentlandit Daerah Baula memiliki kandungan Fe sebesar 18,22-27,34 wt%, Ni sebesar 32,59-39,10 wt%, dan Co sebesar 1,24-2,76 wt%, sedangkan yang berasal dari Wolo memiliki kandungan Ni yang jauh lebih tinggi (46,19-53,79 wt%) dan Co (2,79-4,18 wt%), namun memiliki kandungan Fe yang lebih rendah (8,50-15,18 wt%). Berdasarkan diagram terner, pentlandit menunjukkan kisaran temperatur pembentukan yang bervariasi (200 hingga lebih dari 600°C). Pentlandit dipisahkan menjadi dua kelompok: pentlandit Baula (Ni < 40%, Fe > 18%), dengan temperatur stabilitas antara 200 dan 500°C, serta pentlandit Wolo kaya Ni (Ni > 46%, Fe > 16%) dengan temperatur stabilitas di atas 600°C. Pembentukan pentlandit kaya Ni disebabkan oleh batuan ultramafik kaya Ni bereaksi dengan air laut pada temperatur tinggi, sehingga memudahkan proses pemurnian Ni secara efisien selama proses serpentinisasi.

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