Harjanto, Agus and Sutarto, Sutarto and Subandrio, Achmad and Suasta, I Made and Salamat, Juanito and Juanito, Giri Hartono and Suputra, Putu and Fauzi, Muhammad and Rosdiana, Rosdiana (2016) Alterasi Akibat Proses Hidrothermal di Bolaang Mongondow, Propinsi Sulawesi Selatan. Eksplorium Buletin Pusat Teknologi Bahan Galian Nuklir, 37 (1). pp. 27-40. ISSN p-ISSN 0854-1418 e-ISSN 2503-426X
Preview |
Text
Alterasi Akibat Proses Hidrothermal di Bolaang Mongondow, Propinsi Sulawesi Selatan.pdf Download (1MB) | Preview |
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 CuAu±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.
Kata kunci: alterasi hidrotermal, mineralisasi, argillik, profilitik, silifikasi
ABSTRACT
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 Cu-Au±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.
Keywords: hydrothermal alteration, mineralization, argilic, prophyllitic, silisification
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | alterasi hidrotermal, mineralisasi, argillik, profilitik, silifikasi, hydrothermal alteration, mineralization, argilic, prophyllitic, silisification |
| Subjek: | Q Science > QE Geology |
| Divisions: | x. Eprints Lama > 4 |
| Depositing User: | Dr.Ir. MT SITI UMIYATUN CHOIRIAH |
| Date Deposited: | 15 Mar 2022 04:31 |
| Last Modified: | 15 Mar 2022 04:46 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/27922 |
Actions (login required)
 |
View Item |