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中，Ichiyama & Ishiwatari (2005) 报道了侏罗纪 Mum 增生杂岩中的 meimechite（富含 Ti 和 HFSE 的苦铁矿）的地质产状、化学和矿物学，并讨论了它的起源。二叠纪超羽流岩浆作用 Koizumi & Ishiwatari (2006) 报告了绿岩中两种截然不同的现象和化学成分。侏罗纪丹波增生杂岩，即基底推覆型和混杂岩型，并将其起源分别归因于海洋高原和正常海洋漂浮物 Ichiyama 等人（2006）报告了丹波带增生绿岩中出现的铁苦铁矿的化学和同位素组成，并讨论了它们与海洋区域二叠纪超羽流岩浆作用的关系，Ichiyama 等人 (2007) 进一步报道首次对同一地区的显生宙橄榄石-三齿稃玄武岩进行了研究，并与科拉半岛佩琴加地区类似的元古代岩石和 Ichiyama 等人的三齿稔繁殖实验结果进行了比较，讨论了其地质意义。 (2008) 根据不同的 Ti 浓度%将基底推覆型绿岩分为 3 组，并讨论了它们与超羽流岩浆作用的地质和化学演化。我们的相关结果包括 Ishiwatari 等人 (2006)，他们首次报道了伊豆-小博宁-马里亚纳岛弧中存在的埃达克岩，描述了火山岩的分布和化学矿物学多样性。、辉长岩和橄榄岩，并提出了一个模型，即小笠原弧前的母岛海山是由几片蛇绿岩冲断片组成的地垒块， Yanagida 等人 (2007) 报道了从马里亚纳海沟南部向陆坡挖出的镁辉石，显示出极其广泛的矿物化学多样性和地幔橄榄岩的低平衡温度，并提出弧前-弧后地幔部分暴露在海沟斜坡上，Ishiwatari 等人 (2007) 报道。来自俄罗斯东北部佩库尔内山脉的非常罕见的大型石榴石橄榄岩-超镁铁质杂岩。