LATERAL VARIATION OF REE PATTERN OF BASALTIC MAGMA ACROSS THE JAPAN ARC
LATERAL VARIATION OF REE PATTERN OF BASALTIC MAGMA ACROSS THE JAPAN ARC
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日本弧上玄武岩浆的稀土元素模式的横向变化
DOI：
10.2465/ganko1941.75.313
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
H. Kurasawa
中科院分区：
文献类型：
--
作者：
H. Fujimaki;H. Kurasawa
用稳定同位素稀释法测定了大岛岛、八条岛和新日本岛第四纪玄武岩、苏联火山、东京火山、Ichinomegata火山、Joboshi火山和富士火山以及日本滨田地区的玄武岩中的稀土和钡。结合新获得的数据和前人报道的数据，可以观察到日本弧玄武岩稀土配分模式的横向变化。玄武岩中轻稀土元素从太平洋一侧向日本海一侧逐渐增加。一些拉斑玄武岩具有接近平坦的稀土配分模式，这类似于产于拉斑玄武岩附近的高铝玄武岩的近平坦稀土配分模式。远离日本海沟的高铝玄武岩的稀土配分模式具有陡峭的坡度，与典型碱性玄武岩的稀土配分模式无法区分。
REE and Ba have been determined, by the stable isotope dilution method, on the Quaternary basaltic rocks from the Oshima, Hachijo-jima and Nii-jima islands, from the Usu, Tokachi, Ichinomegata, Joboshi and Fuji volcanoes and the Hamada area in Japan. Considering the newly obtained data and the previously reported data, lateral variation of the REE patterns for basaltic rocks across the Japan arc can be observed. Light REE in basaltic rock increase gradually from the Pacific Ocean side to the Japan Sea side. Some of the tholeiitic basalts have nearly flat REE patterns which are similar to the nearly flat REE pattern for the high alumina basalt occurring in vicinity of the tholeiite province. The REE pattern for the high alumine basalt occurring far from the Japan trench has asteep slope, which cannot be distinguished from the REE pattern for typical alkali basalt.