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All Journal Buletin Sumber Daya Geologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Sudarsono Sudarsono
Pusat Penelitian Geoteknologi-LIPI
Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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DISTRIBUSI MINERALOGI PASIR BESI PADA JALUR PANTAI SELATAN KEBUMEN – KUTOARJO Chusni Ansori; Sudarsono Sudarsono; Saefudin Saefudin
Buletin Sumber Daya Geologi Vol. 6 No. 2 (2011): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1603.665 KB) | DOI: 10.47599/bsdg.v6i2.109

Abstract

Mineral yang didapatkan berupa mineral magnetik dan bukan magnetik yang merupakan mineral pengotor. Mineral magnetik berupa magnetit lepas dan magnetit ikat dengan mineral olivin, piroksin, biotit, dan hornblenda. Sedangkan mineral bukan magnetik berupa kuarsa, plagioklas, K-feldspar, zirkon, rutil, dan karbonat/fosil. Pada pasir halus (ukuran 100 #) kandungan magnetit ikat serta asosiasi mineral lain yang mengandung unsur besi mencapai 37,41% sedangkan magnetit lepas 16,73%. Pada pasir kasar-sedang (ukuran 50 #) kandungan magnetit ikat 22,47% dan magnetit lepas 11,47%. Mineral magnetik sebagian besar terdapat pada pasir halus dengan ukuran +100# hingga -100#. Pola sebaran mineral bersifat magnetik pada fraksi kasar maupun halus cenderung meningkat ke arah timur (Kutoarjo). Sedangkan mineral bukan magnetik seperti kuarsa, plagioklas, k-feldspar dan zirkon semakin tinggi kandungannya ke arah barat. Perbedaan karakteristik sebaran mineral karena kontrol geologi dan proses liberasi magnetit yang berbeda.
KARAKTER DAN TIPE MINERALISASI HIDROTERMAL DI WILAYAH BOMBANA BERDASARKAN STUDI MINERALOGI DAN GEOKIMIA I. Setiawan; S. Indarto; AF. Ismiyanto; Sudarsono Sudarsono
Jurnal Geologi dan Sumberdaya Mineral Vol. 22 No. 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v22i3.115

Abstract

Bombana gold mineralization occurs within metamorphic rocks hosted environment, and it's not yet reported having connection with magmatisme/volcanisme. Therefore most ore mineral deposits have to be related with volcanisme bearing metallic mineralization. The aim of this study is to explain the character and types of gold deposit using petrography, mineragraphy, fluid inclusions, AAS, and geochemistry methods.Bombana area formed by orogenic activities which is composed by metamorphic rocks mainly consists by greenschist facies and ultra mafic rocks. Petrographically rocks called as garnet glaukofane amphibol schist, peridotite, serpentinite, sandstone meta, limestone meta, andesite meta, and altered rocks. While based on major elements composition, their parent rocks has ultrabasic-acidic rocks composition, formed peridotite to andesite.Gold mineralization of Bombana area indicates an epithermal-mesothermal type, which is exhibited by hydrothermal evidences such as crosscut veins after foliation and alteration at vicinity of quartz/calcite veins. These indicate that mineralization resulted by hydrothermally process and formed after metamorphism. Ore minerals consisted of gold, pyrite, chalcopyrite, goethite, lepidocrocite and cinabar and commonly associated with quartz veins as mineralized fluids suggested as low salinity (0,18-1,78)% NaCl equivalent and water rich mineralized fluid, at (210-350)ºC temperatur ranges.Keywords: Bombana, volcanic rocks, epithermal, metamorphism
Co-Authors AF. Ismiyanto Chusni Ansori I. Setiawan S. Indarto Saefudin Saefudin