PRAYUDA, WENDY (2015) TIPE DEPOSIT LATERITE NIKEL SANGAJI, KAB. HALMAHERA TIMUR PROVINSI MALUKU UTARA. Masters thesis, UPN ''VETERAN'' YOGYAKARTA.
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Abstract
Laterite nickel study area in the northern part of Sangaji is mining concession area held by PT Antam (Persero ) Tbk , which on detailed exploration exploration stage . Ultramafic rocks are part of a series of regional ophiolite that formed as a plate collision obduction ocean crust on the island arc in the western Pacific plate. The result minerals analysis with petrographic methodss are olivine and pyroxene which partially altered into serpentine. Olivine is a mineral that most carriers element of Ni up to 0.3 %. Ultramafic rocks classification based on mineral composition of olivine and piroksen are dunite and peridotite which is weak to strong serpentinization. Weathering process is strongly influenced by the origin of rock types, minerals and elements stability, mobilization ions, residual concentration and enrichment. Relative concentration of elements Mg and SiO2 which is inversely proportional to the mobile elements that are immobile Fe. Laterit nikel di daerah Sangaji Utara bagian dari daerah konsesi penambangan PT Antam (persero) Tbk, yang masih dalam tahap eksplorasi detil. Batuan ultramafik merupakan bagian dari series ofiolit yang secara regional terbentuk karena tumbukan lempeng berupa obduksi kerak samudra pada bagian busur kepulauan di bagian barat Pasifik. Hasil analisa petrografi, mineral primer batuan adalah olivine dan piroksen, yang sebagian terubah menjadi serpentin. Mineral olivine adalah mineral pembawa unsur Ni yang terbanyak mencapai 0.3%. Klasifikasi batuan ultramafik berdasarkan komposisi mineral adalah dunit dan peridotit yang terserpentinkan lemah hingga sangat kuat. Proses pelapukan sangat dipengaruhi oleh jenis batuan asal, stabilitas mineral dan unsur, mobilisasi ion-ion yang bersifat tidak stabil, konsentrasi residu dan pengayaan. Konsentrasi relatif unsur pada laterit, unsur Mg dan SiO2 yang bersifat mobile berbanding terbalik terhadap unsur Fe yang bersifat immobile.
| 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: | 19 May 2016 01:52 |
| Last Modified: | 19 May 2016 01:52 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/1600 |
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