Geologi Dan Mineralisasi Daerah Satoko Kabupaten Polewali Mandar, Sulawesi Barat
Abstract
Batuan pembawa mineralisasi daerah Satoko berupa syenodiorit yang telah mengalami ubahan argilik dengan komposisi didominasi monmorilonit dan haloisit dengan sedikit nontronit. Luas daerah mineralisasi sekitar 0.49 km2, dalam bentuk urat-urat kuarsa yang teramati pada beberapa sumur uji. Urat kuarsa berwarna putih susu dengan struktur banded, vuggy dan dog teeth terisi pirit sangat halus, oksida besi, hematit dan limonit. Ketebalan urat kuarsa bervariasi antara 2 – 4 cm dan membentuk zona urat mencapai lebar 40 cm. Analisis kimia dari conto urat kuarsa menunjukkan nilai tertinggi kandungan unsur logam 6.326 ppm Au, 40 ppm Cu, 5.526 ppm Pb, 379 ppm Zn, 5 ppmAg, 4.65% Fe, 35 ppmAs, 8 ppm Mo dan 7 ppm Sb. Korelasi yang erat ditunjukkan oleh kemunculan Cu, Pb dan Zn dengan nilai koefisien diatas 0,8, sedangkan Au menunjukkan korelasi negatif dengan unsur-unsur lain. Analisis inklusi fluida mengindikasikan mineralisasi terjadi pada kisaran temperatur antara 220°-300°C dan kedalaman 291,53 – 863,16 m Kisaran temperatur tersebut merupakan lingkungan tipe mineralisasi epitermal.Downloads
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