Comparative study of oceanic mantle and Island-arc mantle

大洋地幔与岛弧地幔的对比研究

基本信息

  • 批准号:
    63540668
  • 负责人:
  • 金额:
    $ 0.32万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1988
  • 资助国家:
    日本
  • 起止时间:
    1988 至 1989
  • 项目状态:
    已结题

项目摘要

Mantle materials in the oceanic and Island-arc regions have been studied in this project. The mantle materials are nodules in alkali basalts in Salt Laice Crater, Hawaii, and in Shingitumura, central Shikoku, as representatives of the coeanic and Island-arc regions, respectively. The mantle materials in Salt Lake Crater are various in rock-type ranging from plagioclase to garnet lherzolite. Pressure and temperature conditions are 31cb at 74OoC for the plaulioclase lherzolite and 20 kb at 1070゚C for the garnet lherzolite. These data show that the geotherm xinderiieath the Hawaiian Islands are quite high, probably due to heating by continuius uplift of basaltic materials, i.e, mantle plume. There are two types of pyroxenites;garnet and spinel pyroxenites. These pyroxenites are cumulus products at pools in the lherzolites. The garnet in the garnet pyroxenite was formed by the reaction of spinel and pyroxenes during lateral movement of the oceanic plate.On the other hand, mantle materials in Shinguu-mura are various in rock-type, but pressure and temperature conditions are restricted around 9 kb at 900゚C. All the ultramafic and mafic nodules belong to the granulite facies conditions, hence calcic plagioclase and olivine assemblage, found in cumulate, are not stable to form spinel and pyroxenes at the contact. Such cumulus rock-types are common in the alkali basalt and their temperature are similar to those of the lherzolite. The alkali basalt also included metamorphic rocks similar to the country rocks of the Singuu-mura. Although intermediate rock between the metamorphic and ultramafic-mafic rocks has not been recognisible, lower crust and upper mantle under Shinguu-mxira are highly complex due to intrusions of basaltic materials and subsequent coolings and reactions.
本项目研究了大洋和岛弧地区的地幔物质。地幔物质为夏威夷盐Laice Crater和四国中部Shingitumura碱玄武岩中的结核,分别代表大洋区和岛弧区。盐湖火山口地幔物质岩石类型多样,有斜长石,也有石榴石—辉橄榄岩。长长石沸石在74OoC下的压力和温度条件为31cb,石榴石沸石在1070c下的压力和温度条件为20kb。这些数据表明,夏威夷群岛的地热新层相当高,这可能是由于玄武岩物质(即地幔柱)的持续上升而加热的结果。辉石岩有两种类型;石榴石和尖晶石辉石岩。这些辉石岩是辉石岩池中的积云产物。石榴石辉石岩中的石榴石是在大洋板块横向运动过程中尖晶石与辉石相互作用形成的。另一方面,新谷村的地幔物质岩石类型多样,但压力和温度条件在900℃时限制在9 kb左右。超基性结核和基性结核均属于麻粒岩相条件,因此堆积状钙斜长石和橄榄石组合在接触处不稳定形成尖晶石和辉石。这种积云岩石类型在碱性玄武岩中很常见,其温度与辉橄榄岩相似。碱性玄武岩还包括与Singuu-mura的乡村岩石相似的变质岩。虽然在变质岩和超基性基性岩之间的中间岩石尚未被识别,但由于玄武岩物质的侵入以及随后的冷却和反应,新谷-木下的下地壳和上地幔非常复杂。

项目成果

期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Atsushi Goto,Kazumi Yokoyama: "Lherzolite inclusions in olivine nephelinite tuff from Salt Lak Crater,Hawaii" Lithos. 21. 67-80 (1988)
Atsushi Goto、Kazumi Yokoyama:“来自夏威夷 Salt Lak 火山口的橄榄石霞石凝灰岩中的二辉橄榄石包裹体”Lithos。
  • DOI:
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    0
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  • 通讯作者:
Atsushi,Goto,Kazumi Yokoyama: "Lherzolite inclusions in olivine nephelinite tuff from Salt Lake Crater,Hawaii" Lithos. 21. 67-80 (1988)
Atsushi,Goto,Kazumi Yokoyama:“来自夏威夷盐湖火山口的橄榄石霞石凝灰岩中的二辉橄榄石包裹体”Lithos。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
後藤篤・横山一己: Lithos. 21. 67-80 (1988)
Atsushi Goto 和 Kazumi Yokoyama:Lithos。21. 67-80 (1988)
  • DOI:
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  • 影响因子:
    0
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YOKOYAMA Kazumi其他文献

YOKOYAMA Kazumi的其他文献

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{{ truncateString('YOKOYAMA Kazumi', 18)}}的其他基金

Age analyses of Cretaceous granitic rocks in the Japanese Islands
日本列岛白垩纪花岗岩的年龄分析
  • 批准号:
    20540473
  • 财政年份:
    2008
  • 资助金额:
    $ 0.32万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Provenace study of detrita minerals in the sandstones from the Japanese Islands
日本列岛砂岩中碎屑矿物的来源研究
  • 批准号:
    14540454
  • 财政年份:
    2002
  • 资助金额:
    $ 0.32万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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  • 批准号:
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Petrogenetic Implications of Fluid and Glass Inclusions in Xenoliths and Megacrysts in Alkali Basalt From Nye County, Nevada
内华达州奈县碱性玄武岩中捕虏体和巨型晶体中流体和玻璃包裹体的岩石成因意义
  • 批准号:
    7813685
  • 财政年份:
    1978
  • 资助金额:
    $ 0.32万
  • 项目类别:
    Standard Grant
Phase Equilibrium Study of Silicate Systems Bearing on the Origin of Tholeiite and Alkali Basalt Magmas
硅酸盐体系与拉斑玄武岩和碱性玄武岩浆成因的相平衡研究
  • 批准号:
    660A459
  • 财政年份:
    1966
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