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Paleozoic ultramafic volcanic rocks of superplume origin in the accretionary complexes of Japan and its vicinity

日本及其邻近地区增生杂岩中的超地幔柱成因的古生代超镁铁质火山岩

基本信息

批准号：
17540453
负责人：
ISHIWATARI Akira
金额：
$ 2.43万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

The results of this study are already published as many international journal papers. Ichiyama & Ishiwatari (2005) reported geological occurrence, chemistry and mineralogy of meimechite (Ti and HFSE-rich picrite) from the Jurassic Mum accretionary complex, and discussed its origin in the Permian superplume magmatism. Koizumi & Ishiwatari (2006) reported two contrasting occurrences and chemistry of greenstones in the Jurassic Tamba accretionary complex, namely basal nappe type and melange type, and attributed their origin to oceanic plateau and normal ocean float respectively Ichiyama, et al. (2006) reported chemical and isotopic composition of ferropicrites occurring in the accreted greenstones of the Tamba belt, and discussed their origin in relation to the Permian superplume magmatism in the oceanic area Ichiyama et at (2007) further reported olivine-spinifex basalt from the same area for the first time from the Phanerozoic, and discussed its geological significance in comparison wit … More h the similar Proterozoic rock occurring in the Pechenga area, Kola Peninsula and the results of spinifex reproduction experiments. Ichiyama et at (2008) divided basal nappe-type greenstones into 3 groups by distinct Ti concentration% and discussed their geological and chemical evolution in relation to the magmatism of a superplume's head and tail in the Permian oceanic area. Our related results include Ishiwatari, et al. (2006), which reported occurrence of adakite Sr the first time from the Izu-Bonin-Mariana arc, depicted distribution and chemical-mineralogical diversity of volcanic rocks, gabbros and peridotites, and presented a model that the Hahajima Seamount in the Bonin Forearc is a horst block composed of several ophiolitic thrust sheets that was uplifted due to collisional subduction of the Ogasawara Plateau. Yanagida et al. (2007) reported Mg-cummingtonite from metaperidotites dredged from the landward slope of the southern Mariana Trench, showed extremely wide mineral-chemical diversity and low equilibration temperatures of the mantle peridotites, and proposed that a forearc-backarc mantle section is exposed on the trench slope. Ishiwatari et at (2007) reported very rare, large-scale garnet peridotite-ultramafic complexes from the Pekulney Range, northeastern Russia. Less

这项研究的结果已经发表在许多国际期刊论文上。Ichiyama & Ishiwatari（2005）报道了来自侏罗纪Mum增生杂岩的meimechite（富含Ti和HFSE的苦橄岩）的地质产状、化学和矿物学特征，并讨论了其在二叠纪超地幔柱岩浆作用中的成因。Koizumi & Ishiwatari（2006）报道了侏罗纪Tamba增生杂岩中两种截然不同的绿岩产状和化学组成，即基底推覆类型和混杂岩类型，并将其分别归因于海洋高原和正常海洋漂浮物。Ichiyama等人（2006）报道了Tamba带增生绿岩中出现的铁苦橄岩的化学和同位素组成，Ichiyama et at（2007）首次报道了该海域中生代橄榄-刺状玄武岩的发现，并与大洋中二叠纪超地幔柱岩浆作用进行了对比，讨论了其地质意义。 ...更多信息 h.科拉半岛佩琴加地区的类似元古代岩石和刺足类繁殖实验结果。Ichiyama et at（2008）根据不同的Ti浓度%将基底推覆型绿岩分为3组，并讨论了它们与二叠纪大洋区超级地幔柱头部和尾部岩浆作用的地质和化学演化。我们的相关成果包括Ishiwatari等（2006）首次报道伊豆-小笠原-马里亚纳弧中存在埃达克岩Sr，描述了火山岩、辉长岩和橄榄岩的分布和化学矿物多样性，提出了小笠原弧前的边岛海山是一个由多个蛇绿质逆冲岩片组成的地垒块体，小笠原高原。Yanagida等人（2007年）报告了从马里亚纳海沟南部向陆坡挖掘出的变质橄榄岩中发现的镁钙钛矿，表明地幔橄榄岩具有极其广泛的矿物化学多样性和较低的平衡温度，并提出在海沟斜坡上出露了一个弧前-弧后地幔部分。Ishiwatari等人（2007年）报告了俄罗斯东北部佩库尔尼山脉非常罕见的大规模石榴石橄榄岩-超镁铁质杂岩。少