Widodo, Hidayat (2014) MODEL MINERALISASI ENDAPAN EMAS DI DAERAH ESANG KECAMATAN BONEHAU KABUPATEN MAMUJU PROVINSI SULAWESI BARAT. Masters thesis, UPN ''VETERAN'' YOGYAKARTA.
|
Text
SARI.pdf Download (116kB) | Preview |
Abstract
Tatanan tektonik regional Sulawesi Barat termasuk dalam Median Line (Guntoro,1999) dan tektonik berlangsung pada Miosen Tengah hingga Miosen Akhir berupa pengangkatan blok Median Line tersebut sebagai accretionary terraines atau busur luar dari suatu tatanan tektonik subduksi diantara continental arc dan back arc. Analisis struktur geologi menunjukkan bahwa struktur geologi yang berkembang di daerah penelitian merupakan struktur kompresi dan berarah sinistral barat barat laut-timur tenggara. Litologi daerah Esang sebagian besar disusun oleh satuan batuan metasedimen yang terdiri dari metabatupasir, metabatulempung, satuan batuan volkanik yang ditemukan berupa lava andesit, tuf dasitik maupun satuan batuan sedimen antara lain batupasir dan aglomerat, batuan intrusi berupa intrusi diorite dan andesit. Alterasi yang ditemukan didaerah Esang berupa alterasi silisifikasi pada umumnya ditemukan disamping zona mineralisasi vein kuarsa hal ini menandakan bahwa alterasi tersebut pembentukannya bersamaan bersamaan dengan genesa mineralisasi. Alterasi argilik yang ditemukan berupa kaolin. Alterasi propilitik yang ditemukan mempunyai penyebaran cukup luas hampir seluruh daerah penelitian telah mengalami alterasi propilitik dengan tingkat alterasi mulai dari weak – moderat – strong. Mineralisasi daerah penelitian yang ditemukan berupa zona vein kuarsa berassosiasi dengan mineral sulfida berupa pirit, pirrhotit, kalkopirit dan galena. Lebar zona mineralisasi bervariatif mulai dari 5 cm – 1 meter. Zona mineralisasi yang ditemukan mempunyai penyebaran baratlaut – tenggara. Bijih (ore deposit) berasosiasi dengan mineral kuarsa, pirit, calcopirit, galena, karbonat dan pirrhotit yang ditemukan di daerah Esang merupakan mineralisasi emas tipe epithermal low sulfidation. West Sulawesi regional tectonic order included in the Median Line (Guntoro, 1999) and tectonic take place in the Middle Miocene to Late Miocene in the form of block removal of the Median Line as accretionary terraines or outer arc of an order tectonic subduction between continental arc and back arc. Analysis of geological structures indicate that the geological structure is developed in the study area is a compression structure and trending sinistral west northwest-east southeast. Lithology Esang area mostly composed by metasedimen lithologies consisting of metasandstones, metaclaystone, volcanic rock units found in the form of andesitic lava, tuff dasitic and sedimentary lithologies such as sandstones, intrusive rocks such as diorite and andesite intrusions. Alteration is found in the region Esang a silicified alteration zones are generally found in addition to the mineralized quartz vein this indicates that the alteration of its formation in conjunction with the genesis of the mineralization. Argillic alteration found in the form of kaolin. Propylitic alteration were found to have spread widely enough almost the entire study area has under gone propylitic alteration with the alteration rate ranging from weak - moderate - strong. Mineralization is found in the form of research areas associated quartz vein zones with sulfide minerals such as pyrite, pirrhotite, chalcopyrite and galena. The width of the mineralized zone varied ranging from 5 cm - 1 meters. The mineralized zone is found to have spread the northwest - southeast. Ore deposits associated with quartz, pyrite, calcopirit, galena, carbonate and pirrhotite Esang found in the area of gold mineralization is epithermal low sulfidation type.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Erny Azyanti |
| Date Deposited: | 18 May 2016 08:12 |
| Last Modified: | 18 May 2016 08:12 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/1561 |
Actions (login required)
 |
View Item |