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- W164910618 abstract "High-Si dacites comprise one mode in each of two bimodal volcanic rock suites in Fiji. Both suites are low-K throughout but differ in level of iron-enrichment and light REE-enrichment. Sparsely-phyric dacite lava and tephra cover 102-103 km2 in each suite, apparently having erupted in shallow marine environments. Tephra predominates. Typical phenocrysts are plagioclase >>quartz >>Fe-Ti oxides and augite; hypersthene and hornblende are rare and biotite is absent. Most samples have >72% SiO2, <15% Al2O3, and <0.8% K2O. Normatively, most have 6% Or and An x 100/(Ab + An) ratios of 20 over a wide range in Ab/Qz ratios; thus they cross the feldspar-quartz cotectic at a high angle. Their compositions are similar to those of 20 to 40% partial melts of basalt at PH2O = 5 kb. Tonal ite-trondhjemite and gabbro plutons also form a bimodal suite. Trondhjemite and dacite mineralogy and compositions are analogous although trondhjemites contain primary hornblende. REE patterns vary considerably in the three otherwise similar suites, ranging from light REE-depletion with Lae.f. =8, to middle REE-enrichment with Nde.f. = 360, to middle-REE depletion with Dye.f = 7 (Fig. 5). The latter characterizes all trondhjemites analyzed and is compatible with fusion of lower Fijian crust." @default.
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- W164910618 date "1979-01-01" @default.
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- W164910618 title "Miocene Low-K Dacites and Trondhjemites of Fiji" @default.
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