Petrology and geochemistry of Miocene igneous rocks on Rebun Island, northern Hokkaido, Japan
Petrology and geochemistry of Miocene igneous rocks on Rebun Island, northern Hokkaido, Japan
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日本北海道北部礼文岛中新世火成岩的岩石学和地球化学
DOI：
10.2465/jmps.070421
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发表时间：
2008
影响因子：
0.7
通讯作者：
K. Shuto
中科院分区：
文献类型：
--
作者：
Y. Hirahara;K. Shuto
我们确定了日本北海道北部仁本岛中新世岩浆活动的四个阶段：阶段I(18 Ma)、阶段II(13 Ma)、阶段III(10 Ma)和阶段IV(<；10 Ma)。第一阶段和第二阶段分别产生了小规模的榴辉岩和英安岩侵入。在第三阶段，玄武岩-安山岩熔岩喷发，而第四阶段的岩浆作用形成了具有英安岩脉的榴辉岩、斑岩和安山岩的大型侵入体。考虑玄武岩熔体的分异结晶作用，可以解释三期和四期岩石主量元素和微量元素组成差异较大的原因，但两期岩石的分相比例不同。此外，与IV期岩石相比，III期岩石具有较低的不相容元素浓度和较高的Zr/Y比值，具有相似的Zr/Nb比值，表明源岩的部分熔融程度较高。~(87)Sr/~(86)Sr(SRI)和~(143)Nd/~(144)Nd(NDI)的初始值表明，尽管IV期安山岩明显是在侵入沉积岩的过程中同化分离结晶(AFC)形成的，但所有阶段的岩石都来自同一物质来源，大多数岩石的SRI和NDI值与日本海弧后盆地扩张过程中亏损的软流圈地幔上涌形成的玄武岩相似。此外，第一阶段岩石的不相容元素特征与日本海弧后盆地玄武岩的不相容元素特征相似。相反，II-IV期岩石与北海道北部俯冲相关岩浆活动形成的玄武岩相似。
We identify four stages in the Miocene magmatic activity on Rebun Island, northern Hokkaido, Japan: Stage I (18 Ma), Stage II (13 Ma), Stage III (10 Ma), and Stage IV (<10 Ma). Stages I and II produced small intrusions of dolerite and dacite, respectively. During Stage III, basalt to andesite lavas erupted, while the magmatism of Stage IV formed large intrusions of dolerite, porphyrite, and andesite with dacitic veins. The large variations of major and trace element compositions of Stage III and IV rocks can be explained by considering the fractional crystallization of a basaltic melt; however, the proportion of phases fractionating is different for the two stages. Further, in comparison to Stage IV rocks, Stage III rocks have lower concentrations of incompatible elements and higher Zr/Y ratios with similar Zr/Nb ratios, suggesting higher degree of partial melting of the source material. The initial values of 87Sr/86Sr (SrI) and 143Nd/144Nd (NdI) indicate that the rocks of all stages were derived from a common source material, although Stage IV andesites were apparently formed by assimilation fractional crystallization (AFC) during their intrusion into sedimentary rock. Most of the rocks have SrI and NdI values similar to those of basaltic rocks derived from the upwelling of depleted asthenospheric mantle during the spreading of the Japan Sea back-arc basin. In addition, incompatible element signatures obtained for Stage I rock are similar to those obtained for the basalts in the Japan Sea back-arc basin. In contrast, Stage II-IV rocks are similar to the basaltic rocks that originated from subduction-related magmatism in northern Hokkaido.
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影响因子：
2.8
作者：
S. Kimura;N. Shikazono;Hirohiko Kashiwagi;M. Nohara
通讯作者：
S. Kimura;N. Shikazono;Hirohiko Kashiwagi;M. Nohara
影响因子：
1.8
作者：
K. Shuto;J. Ohki;H. Kagami;M. Yamamoto;N. Watanabe;K. Yamamoto;N. Anzai;T. Itaya
通讯作者：
K. Shuto;J. Ohki;H. Kagami;M. Yamamoto;N. Watanabe;K. Yamamoto;N. Anzai;T. Itaya
影响因子：
3.5
作者：
J. Pearce;M. Norry
通讯作者：
J. Pearce;M. Norry
日本东北部新泻地区早至中三氧世时期岩浆源的地球化学长期变化：弧后盆地打开期间的软流圈地幔上涌
DOI：
--
发表时间：
2006
期刊：
Lithos 86
影响因子：
--
作者：
Shuto;K.;Ishimoto;H.;Hirahara;Y.;Sato;M.;Matsui;K.;Fujibayashi;N.;Takazawa;E.;R.;et al.
通讯作者：
et al.