Mineral mangan yang terdapat dalam cebakan komersial ada 13 jenis, namun yang merupakan mineral utama sebagai cebakan bijih mangan adalah pirolusit dan psilomelan. Dalam lima tahun teraktiir, konsumsi mangan di industri baterai, keramik dan porselain, logam, dan korek api mengalami peningkatan pesat, namun karena jumlah cadangan mangan dengan k…
Di dalam PELITA taha.p ke-II, tahun anggaran 1975/1976, yaitu pada bulan Ju.li 1975, Seksi Penelitian Geofisika. telah mulai melakukan penyelidikan Ke- ma.eneta.n Purba di pulau Lombok denga.n penga.mbilan oontolr ba.tuan terorienta.sisebanya.k 18 buah contoh ba.tuan (lampiran 1 ).
lt1.ksud penga.mbilan oontoh ba.tuan2 tersebut eela…
Leo, G.W., Hedge, C.E. and Marvin, R.F., 1980. Geochemistry, strontium isotope data, and potassium-argon ages of the andesite-rhyolite association in the Padang area, West Sumatra. J. Volcanol. Geotherm. Res., 7: 139-156.
Quaternary volcanoes in the Padang area on the west coast of Sumatra have produced two-pyroxene, calc-alkaline ande…
The Tertiary volcano-plutonic arc exposed along the west coast of Sumatra can be traced to the south coast of Java. The corresponding subduction zone can be found in the islands west of Sumatra and the submarine ridge south of Java.
The Late Cretaceous plutonic belt of Sumatra does not continue to Java but passes north of it,…
Katili, J .A., i 973. Geochronology of West Indonesia and its implicatioti on plate tectonics: .Tectono:.physics, 19: 195-212. The results of radiometric dating of granitic rocks around Kotanopan near the west coastof-Ce0ntr~l umatra indicate an average age of 45 million years.
Granites from the Lissi Mass in t…
Paleomagnetic studies of lams from the island of Hawaii have established the following: (1) All lavas now exposed on the island are less than 1 million years old (Pleisto• cene). (2) The present absence of nondipole field components in the central Pacific ar…
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Deskripsi Fisik
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