DYNAMICS OF MAGMA GENERATION

岩浆生成动力学

• 批准号: 05231106
• 负责人: TATSUMI Yoshiyuki
• 金额: $ 45.25万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05231106/
• 关键词: MAGMA; MANTLE DYNAMICS; SUBDUCTION ZONES; BACK ARC BASIN; HOTOSPOT; マグマ成因論; 沈み込み帯火山; プレート内火山; コンピュータシミュレーション; 化学的特徴; 全マントル物質循環; マントル; ダイナミクス

The final goal of our magmalogical studies is comprehensive understanding of dynamic processes occurring in the Earth's mantle. Although the goal may be far beyond our present attainment, we have got some important results constraining such processes :(1) Degrees of element transpor during dehydration of the subducted lithosphere have been documented based on highpressure experiments. The results can reasonable explain the geochemical characteristics of arc magmas.(2) Seismic velociry of hydrous mantle materials has been obtained at high pressures and temperatures. The values are consistent with seismologically observed values, suggesting the location of hydrous peridotite layr at the base of the mantle wedge.(3) Numerical simulation of mantle wedge temperature has demonstrated the location of high-temperature region within the mantle wedge, capbale for production of arc magmas.(4) A comprehensive model for arc magma genesis, which can explain general characteristics of arc magmatism and is also constrained by the above results, has been proposed.(5) Dynamic processes associated with back arc rifting, including geochemicale and thermal evolution of the mantle wedge, have been clarified.(6) Geochemical works on S Pacific HIMU hotospot lavas have provided evidence for whole-mantle-scale recycling of oceanic crust materials.

我们的岩浆研究的最终目标是对地球地幔中发生的动态过程的全面理解。尽管目标可能远远超出了我们目前的成就，但我们获得了一些重要的结果来限制此类过程：（1）基于高压实验，已记录了岩石圈脱水期间元素转运的度。结果可以合理地解释弧岩岩的地球化学特征。（2）在高压和温度下获得了含水地幔材料的地震速度。该值与在地震楔形底部底部的含水橄榄岩层的位置相一致，表明对地幔楔的底部的位置。（3）地幔楔形温度的数值模拟已证明了地幔楔内的高温区域的位置，用于生产Arc Magmas的Capbale capbale anc Magmas和ARC的杂经（4）可以解释ARC的特征。已经提出了上述结果。（5）与背部弧裂之间相关的动态过程，包括地球楔的地球化学和热层的热演化。（6）6）关于太平洋毛果室的地球化学作品，已经提供了全面尺度尺度回收海层材料的证据。

项目成果

Y.Tatsumi: "Subduction Zone Magmatism" Blackwell, 211 (1995)

Y.Tatsumi：“俯冲带岩浆作用”Blackwell，211 (1995)

Y.Furukawa: "Depth of decoupling plate interface and thermal structure under arcs." Journal of Geophysical Research. 98. 20005-20013 (1993)

Y.Furukawa：“去耦板界面的深度和电弧下的热结构。”

Tatsumi, Y.: Subduction zone magmatism : a contribution to whole mantle dynamics. University of Tokyo Press, 186 (1995)

Tatsumi, Y.：俯冲带岩浆作用：对整个地幔动力学的贡献。

T.Kogiso: "HIMU ocean island basalts in southern Polynesia:new evidence for whole-mantle scale recycling of subdusted oceanlc crust" J.Geophys.Res.(in press). (1997)

T.Kogiso：“波利尼西亚南部的 HIMU 洋岛玄武岩：淡粉状洋壳全地幔规模再循环的新证据”J.Geophys.Res.（出版中）。

巽 好幸: "沈み込み帯のマグマ学 -全マントルダイナミクスに向けて" 東京大学出版会 (印刷中), (1995)

辰巳义之：“俯冲带的岩浆学 - 走向整个地幔动力学”，东京大学出版社（正在出版），（1995）