Ditemukan 1 dokumen yang sesuai dengan query
U. Hartono
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High magnesian andesites are found in the Cretaceous Haruyan volcanics in Southeast Kalimantan. The rocks have Mg# 67 ? 69, but low concentrations of Ni (44 ? 60 ppm), Cr (37 ? 411 ppm) and, except two samples of 95UH23C and 96UH23, ratios of Sr/ Y are also low. Geochemical and tectonic studies show that the high magnesian andesites were
originated from a subduction zone-type magma similar to that of the most ?normal? Haruyan volcanics. . ...
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Bandung: Pusat Survai geologi Bandung, 2010
551 JSDG 20:5 (2010)
Artikel Jurnal Universitas Indonesia Library
