Idarwati (2013) ALTERASI DAN MINERALISASI TIPE DEPOSIT EMAS DAERAH LAKEA, KECAMATAN LAKEA KABUPATEN BUOL, PROVINSI SULAWESI TENGAH. Masters thesis, UPN ''VETERAN'' YOGYAKARTA.
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Abstract
Lokasi penelitian terletak di Desa Lakea, Kecamatan Lakea, Kabupaten Buol,
Propinsi Sulawesi Tengah. Litologi penyusun daerah penelitian terdiri dari tiga satuan,
litodem lava basalt merupakan material hasil gunungapi tipe strato yang disusun oleh andesit
dan basalt di beberapa tempat yang terkekarkan, breksi volkanik, dan tuff. Satuan batupasir
tersusun oleh perselingan batupasir dan batulempung dengan sisipan konglomerat dan satuan
batugamping koral disusun atas batugamping.
Zona alterasi daerah telitian dibagi menjadi empat zona, yaitu zona alterasi argilik
(silicon oxide (kuarsa), magnesium aluminum iron silicate hydroxide, potassium aluminum
silicate hydroxide dan sodium calcium aluminum silicate (albit), , zona alterasi philik
(serisit/muskovit-kuarsa-klorit-feldspar), zona alterasi propilitik (klorit-serpentin, illit, albit,
kalsit, kuarsa, muskovit), zona alterasi silisifikasi (kuarsa/silica + adularia + kalsit± illit).
Mineral emas dan asosiasinya, biasanya mengisi ruang kosong (open space filling), sebaran
(disseminated) dengan asosiasi mineral adalah pirit, kalkopirit, dan galena. Mineralisasi
dijumpai mengisi kekar-kekar yang cenderung ke arah tenggara–baratlaut. Hasil pengukuran
mikrotermometri didapatkan Th (temperatur homogenisasi saat fluida terjebak dalam Kristal)
berkisar dari 172 ~ 332 oC dengan kisaran pengukuran 180,9 – 211,0 oC, dan suhu pelelehan
(first ice melting temperatures/Tm) rata-rata berkisar -1,2 – -0,8 oC. Dengan perhitungan
diperoleh angka kedalaman pembentukan 79,4 ~ 1712 m, dan dibawah tekanan 8,2 ~
130,3 bar dengan salinitas 1,4 ~ 2,2 % WT.
The research area is located in the village of Lakea, Lakea subdistrict, Buol district,
Central Sulawesi Province. Constituent Lithology within research area consists of three
units, these are litodem lava basalt that mainly be composed by lava andesite and lava basalt
which partly fractured, volcanic breccia, and tuff; Sandstone Unit mainly composed by
sandstone, mudstone, muddy sandstone, and conglomerate; and the last unit is limestone as
Coral Limestone Unit.
Alteration assemblage is divided into four zones, namely argillic alteration zone
(silicon oxide (kuarsa), magnesium aluminum iron silicate hydroxide, potassium aluminum
silicate hydroxide dan sodium calcium aluminum silicate (albit), phyllic alteration zone
(serisit/muskovit-kuarsa-klorit-feldspar), propylitic alteration zone (Chlorite-serpentine,
Illite, Albite, calcian, ordered, Quartz, Muscovite ), and silicified alteration zone
(quartz/silica + adularia + calcit± illite). The mineralization is controlled by open space
filling with disseminated distribution. Gold mineralization usually associated with pyrite,
chalcopyrite, and galena. Mineralization is found fill the major structural pattern with
southeast-northwest direction. The fluid inclusion measurement results obtained that
microthermometry Th (homogenization temperature when the fluid trapped in the crystals)
ranged from 172 ~ 332 °C with a measurement range from 180.9 to 211.0 °C, and the
melting temperature (first ice melting Temperatures / Tm) average ranges -1, 2 to 0.8 oC. By
calculations, the depth of the formation rate is 79.4 ~ 1712 m, and under pressure about 8.2
~ 130.3 bar and salinity1,4 ~ 2,2 % WT .
| Item Type: | Thesis (Masters) |
|---|---|
| Subjek: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Erny Azyanti |
| Date Deposited: | 19 May 2016 04:25 |
| Last Modified: | 19 May 2016 04:25 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/1661 |
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