Abstract
Difficult access to the field in Central Sulawesi causes the process of identifying prospects for mining minerals requires a relatively large time and cost. Therefore, the remote sensing approach can be carried out as a preliminary study to determine the distribution of hydrothermal alterations that characterize the presence of mine minerals. This study utilizes Landsat 8 imagery to obtain the distribution of alteration minerals, especially the group of ferrous mineral oxide and hydroxide minerals, clay and carbonate minerals and Ferromagnesian minerals. The method used is composite (RGB) 4/2, 6/7, 5 and 4/2, 6/7, 10 to detect the distribution of alteration minerals. Whereas the Density Slicing method uses 4/2, 5/6 and 6/7 ratio images to detect Ferrugitation, Ferromagnesian, clay and carbonate minerals. The results of the analysis showed the distribution of iron oxide and hydroxide minerals (Ferrugination) dominated the area in alluvium and opiolite rocks. This alteration distribution is interpreted as a prospect of further studies of the presence of mining minerals such as nickel and iron. Whereas ferromagnesian minerals, clays and carbonates dominate in conglomerate and limestone rocks.
Highlights
Difficult access to the field in Central Sulawesi causes the process of identifying prospects for mining minerals requires a relatively large time and cost
The results of the analysis showed the distribution of iron oxide and hydroxide minerals (Ferrugination) dominated the area in alluvium and ophiolite rocks
Peta Geologi Lembar Poso, Sulawesi; Edisi ke-2
Summary
Sulawesi terletak di kepulauan Indonesia utara yang dikaitkan dengan kompleks interaksi lempeng Asia Tenggara, Pasifik, dan IndiaAustralia Banyaknya kejadian beberapa porfiri berharga dan logam dasar dan mineralisasi epitermal di Sulawesi dikaitkan dengan pengaturan tektonik ini. Alterasi batuan merupakan proses penambahan atau pertukaran unsur dari suatu mineral menjadi mineral yang baru dan akan menyebabkan perubahan terhadap massa, volume, serta konsenterasi unsur yang dipengaruhi oleh kondisi, komposisi dan konsentrasi kimiawi dari komponen fluida (Dewi, 2018; Putra dkk., 2017; Verdiansyah, 2016). Kadar logam tersebut berasal dari endapan-endapan suatu mineral yang dipengaruhi oleh beberapa karakteristik yang dikenali melalui mineral-mineral alterasi yang terekam melalui batuan (Maskuri, 2010). Penelitian ini bertujuan untuk mengetahui dan melakukan pemetaan awal mengenai sebaran alterasi hidrotermal di lokasi penelitian, sekaligus studi awal mengenai prospek mineral tambang yang diharapkan dapat dijadikan referensi dalam eksplorasi detail. Studi awal ini dimaksudkan untuk mengoptimalisasi pemanfaatan citra satelit (khususnya Landsat 8) dalam kegiatan eksplorasi awal yang umumnya membutuhkan biaya dan waktu yang cukup besar, khususnya untuk remote area seperti di lokasi penelitian ini. Diharapkan dalam penelitian ini juga menghasilkan peta sebaran lokasi prospek mineral tambang, sehingga dapat digunakan dalam data potensi mineral tambang di daerah
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