Harjanto, Agus and Sutanto, Sutanto and Sutarto, Sutarto and Subandrio, Achmad and Suasta, I Made and Hartono, Giri and Suputra, Putu and Basten, I Gde and Fauzi, Muhammad and Rosdiana, Rosdiana (2016) ALterasi Akibat Proses Hirothermal di Bolaang Mongondow, Provinsi Sulawesi Utara. EKSPLORIUM, Buletin Pusat Teknologi Bahan Galian Nuklir, 37 (1). pp. 27-40. ISSN e-ISSN 2503-426x p-ISSN 0854-1418
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Abstract
Bolaang Mongondow terletak di bagian tengah lengan utara Sulawesi yang disusun oleh busur
magmatik berumur Neogen dan berpotensi mengandung mineral-mineral ekonomis. Hal tersebut
yang melatarbelakangi dilakukan penelitian terhadap potensi sumber daya mineral. Tujuan
penelitian adalah untuk mempelajari alterasi akibat proses hidrotermal serta hubungannya
dengan cebakan emas (Au) berdasarkan kajian di lapangan maupun analisis laboratorium.
Metode yang digunakan dalam penelitian, yaitu kajian literatur, survei geologi, pengambilan
conto batuan, analisis laboratorium, dan pengolahan data. Daerah penelitian merupakan
kompleks intrusi diorit yang terjadi berulang kali. Andesit, batuan klastika gunung api, dan dasit
yang berumur lebih tua diintrusi oleh kompleks ini. Selanjutnya, tufa dasitik, batupasir gunung
api, dan endapan alluvium diendapkan di atasnya. Terdapat tiga sesar utama yang telah diukur
dan dipetakan, berarah timur laut-barat daya yang terpotong oleh sesar barat-timur dan terakhir
sesar barat laut-tenggara yang memotong sesar-sesar terdahulu. Alterasi hidrotermal tahap awal
berhubungan dengan keberadaan diorit kuarsa muda yang menunjukkan tahapan alterasi dari
pusatnya potasik sampai propilitik distal. Alterasi hidrotermal tahap akhir terdiri atas alterasi
argilik, argilik lanjut, dan silika-mineral lempung±magnetit±klorit yang menumpang tindih
alterasi tahap awal. Mineralisasi Cu-Au±Ag di bagian tengah daerah penelitian atau di daerah
Tayap–Kinomaligan sebagian besar berasosiasi dengan diorit kuarsa muda yang teralterasi
potasik dan dipotong oleh urat-urat kuarsa-magnetit-kalkopirit±bornite yang sejajar dan
stockwork.
Bolaang Mongondow is located in central north Sulawesi arm, which is composed of Neogen
magmatic arc and potentially contain economic minerals. This condition is behind the research
purpose to study the mineral resources potencies. Research aim is to study alteration caused by
hydrothermal process and its relation with gold (Au) deposit based on field study and laboratory
analysis. Methodologies used for the research are literature study, geological survey, rocks
sampling, laboratory analysis, and data processing. Research area is a multiply diorite intrusion
complex. Andesite, volcaniclastic rocks, and dacite, the older rocks, were intruded by this
complex. Later, dacitic tuff, volcanic sandstone, and alluvium deposited above them. There are
three measured and mapped major faults heading NE -SW crossed by E-W fault and NW-SE fault
lately crossed all the older faults. Early stage hydrothermal alteration related to the existence of
young quartz diorite, showing alteration stage from the potassic center to distal prophyllitic.
Final stage hydrothermal alteration consist of argilic, advanced argilic, and silica -clay
mineral±magnetite±chlorite alteration overlapping the earlier alteration. Mineralization of CuAu±Ag in central part of research area or Tayap-Kinomaligan area is mostly asociated with
potassic altered young quartz diorite and crossed by paralel and stockworked quartz -magnetitechalcopyrite±bornite vein.
| Item Type: | Article |
|---|---|
| Subjek: | Q Science > QE Geology |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Mrs Sri Lestari |
| Date Deposited: | 07 Jun 2016 04:53 |
| Last Modified: | 07 Jun 2016 07:33 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/3142 |
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