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タイトル: ニュージーランド北島, オハクネ火口産高マグネシア質安山岩と同質デイサイト(鮫島輝彦先生追悼論文集)
その他のタイトル: Hight Mg-andesite and -dacite from Ohakune crater, North Island, New Zealand(MEMORIAL VOLUME TO THE LATE PROFESSOR TERUHIKO SAMESHIMA)
著者: 黒田, 直
野村, 忠司
浦野, 隼臣
掲載誌名: 静岡大学地球科学研究報告
出版者: 静岡大学地球科学教室
巻: 20
開始ページ: 41
終了ページ: 47
出版日付: 1994-03
NDC: 458
抄録: The Ohakune crater is one of the parasitic vents around Ruapehu volcano. Olivine andesite and bronzite dacite occur in and around the crater, the eruption of which took place explosively on the flat laharic plain surrounding Ruapehu volcano. The Ohakune crater rocks ' contain some phenocrysts of Mg-rich olivine (Fo88) or orthopyroxene (En89) , indicating their derivation from the mantle peridotite. The olivine andesites have high contents of MgO (7.3-6.6%) and SiO_2 (55.5-57.4%), similar to magnesian andesites from some island arcs and continental margins. The bronzite dacite also has MgO (5%) despite its relatively high SiO_2 (63.7%). The high-Mg olivine andesites fall near the area of parental basalts and andesites of very low-K and -Rb in the linear trend of the Tongariro volcanic rocks in the K-Rb relation, whereas the high-Mg dacite is plotted on the area of relatively high-K and -Rb in the same linear trend. The dacite may have formed by contamination ( or mixing) of the olivine andesite-forming magma with a high-K and -Rb, felsic crustal material.
ISSN: 03886298 OPAC
NII論文ID: 110000413344 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1993 20

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Others By: 黒田, 直 (クロダ, ナオシ) (Kuroda, Naoshi) -- 野村, 忠司 -- 浦野, 隼臣



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