The geology of the Coromandel subdivision, Hauraki, Auckland . Pdmiceous Fine-grained Agglomerate, Tertiary Volcanic Rocks of Tiiihd Period, as at WillTI \N<;.\. Magnification, l;|J diameters. Work of Mr. Alexander McKay, Geo. Bull. No. ; • [To face p. 86. 87 An analysis of this rhyolite resulted as follows :—Silica (Si02)..Alumina (A1,03)Ferric oxide (Fe203)Ferrous oxide (FeO)Manganous oxide (MnO)Lime (CaO)Magnesia (MgO)Potassium-oxide (K20)Sodium-oxide (Na2)Titanium-oxide (Ti02)Carbonic anhydride (CO 2)Water and organic matter Total 724014090482-520421150204-092-970150-820-86 ..100
The geology of the Coromandel subdivision, Hauraki, Auckland . Pdmiceous Fine-grained Agglomerate, Tertiary Volcanic Rocks of Tiiihd Period, as at WillTI \N<;.\. Magnification, l;|J diameters. Work of Mr. Alexander McKay, Geo. Bull. No. ; • [To face p. 86. 87 An analysis of this rhyolite resulted as follows :—Silica (Si02)..Alumina (A1,03)Ferric oxide (Fe203)Ferrous oxide (FeO)Manganous oxide (MnO)Lime (CaO)Magnesia (MgO)Potassium-oxide (K20)Sodium-oxide (Na2)Titanium-oxide (Ti02)Carbonic anhydride (CO 2)Water and organic matter Total 724014090482-520421150204-092-970150-820-86 ..10015The banded rhyolites show a similar mineralogies] composition to those just described, but the spherulites attain much greater dimensions, sometimes exc ling 1 in. in diameter. Bands in which the larger spherulites, or more frequently the spherical cavities formed by the decomposition of thespherulites, predominate, are found alternating with hands showing a finely laminated structure, thelaminae being evidently coincident with the fluxion plan
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Keywords: ., bookcentury1900, bookdecade1900, bookidgeolog, booksubjectgeology
