High field strength element depletions in the mantle beneath island arc

岛弧下方地幔中的高场强元素损耗

基本信息

  • 批准号:
    07404026
  • 负责人:
  • 金额:
    $ 22.85万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
  • 财政年份:
    1995
  • 资助国家:
    日本
  • 起止时间:
    1995 至 1996
  • 项目状态:
    已结题

项目摘要

The results obtained from this research project are summarized as follows.1) On the basis of Sr and Nd isotopic data for Tertiary and Quaternary volcanic rocks from the NE Japan arc, two isotopically different mantle sources have been proposed by the present workers. One is an undepleted sub-island arc upper mantle from which -35 Ma to -15 Ma basaltic magmas in the back-arc side and -21 Ma to the present basalts in the trench side and transitional zone were extracted. The other is depleted asthenosphere which upwelled and intruded the undepleted subisland arc upper mantle beneath the back-arc side of the NE Japan arc at around 15 Ma.2) The temporal change in HFS element (high field strength element) character of two different parts of the mantle beneath the NE Japan arc was investigated using Nb, Ti, Y and Zr in 103 basaltic samples (MgO*5%, SiO2*53%) from the trench side (including some samples from the transitional zone) and 127 samples from the back-arc side. Systematic differences … More are observed in the HFS element contents of older basalts relative to younger ones. Basaltic rocks derived from the subisland arc upper mantle exhibit a gradual decrease in Zr/Y and a gradual increase in Ti/Zr with decreasing age from -35 Ma to the present, whereas those from the upwelled asthenospheric mantle show different HFS element variations with decreasing age from -15 Ma to the present.3) Basalts with the lowest Zr/Y ratios have been plotted on the 2Nb-Zr/4-Y diagram of Meschede (1986), which shows that the sub-island arc upper mantle of the NE Japan arc has gradually changed its HFS element character from a highly incompatible HFS element-enriched OIB source, to an N-MORB source, to a highly incompatible HFS element-depleted IAB source, with decreasing in age. The gradual depletion in HFS elements with greater incompatibility in the sub-island arc upper mantle may be due to the successive extraction of basaltic magmas from the source since -35 Ma ago. On of Meschede's (1986) diagram basalts derived from the upwelled asthenospheric mantle show a change in the source from slightly depleted in Zr and slightly enriched in Nb compared to N-MORB,to a source slightly depleted both in Zr and Nb compared to N-MORB during the last 15 Ma. Less
本研究项目取得的成果总结如下:1)根据日本东北弧第三纪和第四纪火山岩的Sr和Nd同位素数据,目前的工作人员提出了两种同位素不同的地幔源。一是未枯竭的亚岛弧上地幔,从中提取出弧后侧-35 Ma至-15 Ma玄武岩浆,以及海沟侧和过渡带-21 Ma至现今玄武岩。另一种是贫化软流圈,它在 15 Ma 左右上涌并侵入日本东北弧弧后侧下方未贫化的岛弧上地幔。 2)利用 103 个玄武岩样品(MgO*5%, 沟槽侧的 SiO2*53%)(包括过渡区的一些样品)和弧后侧的 127 个样品。相对于较年轻的玄武岩,较古老的玄武岩的 HFS 元素含量存在系统差异。源自岛弧上地幔的玄武岩,从-35 Ma至今,随着年龄的降低,Zr/Y逐渐减少,Ti/Zr逐渐增加,而来自上升的软流圈地幔的玄武岩,从-15 Ma至今,随着年龄的降低,HFS元素呈现出不同的变化。 3)Zr/Y比值最低的玄武岩绘制在 Meschede(1986)的2Nb-Zr/4-Y图显示,日本东北弧的亚岛弧上地幔的HFS元素特征随着年龄的减小,逐渐从高度不相容的富含HFS元素的OIB源转变为N-MORB源,再转变为高度不相容的贫HFS元素IAB源。亚岛弧上地幔中HFS元素逐渐贫化且不相容性较大,可能是由于-35Ma前玄武质岩浆不断从源区抽取所致。 Meschede (1986) 的来自上涌软流圈地幔的玄武岩图显示,在过去 15 Ma 中,来源从与 N-MORB 相比稍微贫 Zr 和稍微富 Nb,到与 N-MORB 相比 Zr 和 Nb 都轻微贫。较少的

项目成果

期刊论文数量(25)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
宮下純夫: "日本海盆奥尻海嶺玄武岩の岩石学一島弧およびプリュームタイプの火成作用" 地質学論集. 1-21 (1995)
Sumio Miyashita:“日本海盆地奥尻海岭玄武岩的岩石学、岛弧和羽流型火成岩活动”地质评论 1-21 (1995)。
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    0
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宮下純夫: "日本海盆奥尻海嶺玄武岩の岩石学 -島弧およびプリュームタイプの火成作用" 地質学論集. 1-21 (1995)
Sumio Miyashita:“日本海盆地奥尻海岭玄武岩的岩石学 - 岛弧和羽流型岩浆作用”地质评论 1-21 (1995)。
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    0
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大木淳一: "山形県出羽丘陵の中新統青沢層に産する火山岩類のK-Ar年代" 地質学論集. 55-63 (1995)
Junichi Ohki:“山形县出羽山中新世青泽组火山岩的 K-Ar 年龄”地质评论 55-63 (1995)。
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    0
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中嶋聖子: "東北日本弧,後期中新世〜鮮新世火山岩の島弧横断方向における化学組成および同位体組成変化" 地質学論集. 197-226 (1995)
Seiko Nakajima:“日本东北部岛弧方向晚中新世至上新世火山岩的化学和同位素组成变化”地质杂志 197-226 (1995)。
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    0
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Jun'ichi Ohki: "K-Ar ages of volcanic rocks in the Miocene Aosawa Formation occurring in the Dewa Hill, Northeast Japan arc." Memoirs Geol.Soc.Japan. 44. 55-63 (1995)
Junichi Ohki:“日本东北部弧形出羽山中新世青泽组火山岩的 K-Ar 年龄。”
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    0
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SHUTO Kenji其他文献

SHUTO Kenji的其他文献

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{{ truncateString('SHUTO Kenji', 18)}}的其他基金

Partial melting of the crust caused by heating of basalt magma-Generation of felsic magma in the subduction zone
玄武岩浆受热引起地壳部分熔融——俯冲带长英质岩浆的生成
  • 批准号:
    20540463
  • 财政年份:
    2008
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Origin of felsic magmas produced during the spreading of the back-arc basin
弧后盆地扩张过程中产生的长英质岩浆的起源
  • 批准号:
    12440134
  • 财政年份:
    2000
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Mantle plume injection during the spreading of the back-arc basin-Evidences from the volcanic fields in north Hokkaido, Japan-
弧后盆地扩张过程中的地幔柱注入——来自日本北海道北部火山田的证据——
  • 批准号:
    09640541
  • 财政年份:
    1997
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Temporal changes of isotopes in igneous rocks occurring in the ciucum Japan Sea regions
日本海地区火成岩中同位素的时间变化
  • 批准号:
    05452086
  • 财政年份:
    1993
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Temporal and apatial variations of the Cenozoic volcanic rocks from the Notrheast Japan
日本东北部新生代火山岩的时空变化
  • 批准号:
    03302022
  • 财政年份:
    1991
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)
Geological and Petrological studies of the Middle Mocene volcanic rocks distributed around the volcanic front of about 15 Ma in the Northeast Japan arc
日本东北弧约15 Ma火山前缘周围分布的中新世火山岩的地质和岩石学研究
  • 批准号:
    03640639
  • 财政年份:
    1991
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Geological and petrological study of the middle Miocene regional basalts from the Japan Sea side in the NE Japan arc
日本东北弧日本海一侧中新世区域玄武岩的地质和岩石学研究
  • 批准号:
    62540617
  • 财政年份:
    1987
  • 资助金额:
    $ 22.85万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
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