Petrological Model of Crustal to Upper-mantle Structure, NE Honshu arc, Japan

日本本州弧东北部地壳至上地幔结构的岩石学模型

• 批准号: 12304031
• 负责人: YOSHIDA Takeyoshi
• 金额: $ 25.36万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12304031/
• 关键词: NE Honshu arc; Crustal structure; Mantle structure; Caldera; Cretaceous granite; laccolith; Seismic velosity structure; Magma plumbing system; 地殻・マントル構造; デジタル地質図; 火山活動史; 構造発達史; ICP-MS分析; 大陸地殻

The chemical compositions of lower crustal and upper mantle derived xenolith from Ichinomegata volcano were analyzed, and the seismic velocities were measured under high pressures. The data was compared with a seismic velocity structure of NE Honshu arc which obtained recently, and obtained a new petrological model of lower crust and upper mantle in NE Honshu arc, Japan.The results clarified that the average chemical composition of the lower crust is much more basic than estimated before, because they were composed from amphibole gabbro.The geochemical study of the Quaternary volcanic rocks was showed that there was a possibility of low-K tholeiites were they were composed from partial melts of such amphibole bearing lower crustal materials.A paper conceming the emplacement model of granitic rocks was submitted now. We have developed a measuring system of composite magnetic fabric of rocks, and applied it to the Goyo granite from Kitakami mountainland. The resulted multiple magnetic fabric reveled by anisotropy of partial anhysteretic remanent magnetization in the Goyo granite represents discrete kinematic events during evolution of the granitic body.It was clarified by seismic experiments that the magma reservoirs under large-scale collapse calderas show laccolith in its form. The comparison of seismic velocity data and the petrological models of crustal layer have done, and a new evolutional model of crustal structures related magma plumbing system was established and presicely examined in NE Honshu arc, Japan.Many of the current results of this research were published as full papers, and other new results were submitted by several journals or under the preparation for publish.

对Ichinomegata火山的下地壳和上地幔捕虏体的化学成分进行了分析，并测量了高压下的地震速度。将这些数据与最近获得的本州岛弧东北部地震速度结构进行比较，得到了日本本州岛东北部弧下地壳和上地幔的新岩石学模型。结果表明，下地壳的平均化学成分比以前估计的要基本得多，因为它们是由角闪石辉长岩组成的。对第四纪火山岩的地球化学研究表明，存在 低K拉斑玄武岩的可能性是它们是由这种含有下地壳物质的角闪石的部分熔体组成的。现在提交了一篇关于花岗质岩石的侵位模型的论文。我们开发了岩石复合磁性织物测量系统，并将其应用于北上山Goyo花岗岩。 Goyo花岗岩中部分滞滞剩磁的各向异性所揭示的多重磁组构代表了花岗岩体演化过程中的离散运动事件。通过地震实验阐明了大规模塌陷破火山口下的岩浆储库在其形态上表现为虫岩。完成了地震速度数据与地壳层岩石学模型的对比，建立了日本本州岛弧东北部与岩浆管道系统相关的地壳结构演化新模型，并对其进行了预先检验。目前该研究的许多成果已作为全文发表，其他新成果已由多家期刊提交或正在准备发表。

项目成果

Ehiro, M.: "A time gap at the Permian-Triassic boundary in the south Kitakami belt, northeast Japan : An examination based on ammonoid fossils"Saito Ho-on Kai Mus. Nat. Hist., Res. Bull.. no.68. 1-12 (2002)

Ehiro, M.：“日本东北部北上带南部二叠纪-三叠纪边界的时间间隙：基于菊石化石的检查”Saito Ho-on Kai Mus。

永広昌之, 佐藤正道, 高泉幸浩: "宮城県仙台市の中新統茂庭層より産出した頭足類化石Aturiaとその古環境的意義"地球科学. 55. 183-186 (2001)

Masayuki Nagahiro，Masamichi Sato，Yukihiro Takaizumi：“宫城县仙台市中新世Moniwa组的头足类化石Aturia及其古环境意义”地球科学55。183-186（2001）。

八木正彦, 長谷中利昭, 大口健志, 馬場 敬, 佐藤比奈子, 石山大三, 水田敏夫, 吉田武義: "リフト活動の変遷に伴うマグマ組成の変化-東北本州、前〜中期新世の秋田-山形堆積盆地における例-"岩石鉱物科学. 30. 265-287 (2001)

Masahiko Yagi、Toshiaki Hasenaka、Kenji Oguchi、Kei Baba、Hinako Sato、Daizo Ishiyama、Toshio Mizuta、Takeyoshi Yoshida：“与裂谷活动变化相关的岩浆成分变化 - 本州东北部、前中新世秋田山形沉积盆地的例子 - “岩石和矿物科学。30。265-287（2001）

Kimura J-.I., Yoshida T., Iizumi S.: "Origin of low-K andesite lavas at Nekoma volcano, Northeast-Honshu arc, Japan : Geochemical constraints for lower crustal melts"Journal of Petrology. 34(in press). (2002)

Kimura J-.I.、Yoshida T.、Iizumi S.：“日本东北本州岛弧 Nekoma 火山低 K 安山岩熔岩的起源：下地壳熔体的地球化学约束”岩石学杂志。

相澤幸治,吉田武義: "ラコリス状マグマ溜り-陷没カルデラと花崗岩体の接点-"月刊 地球. 22,6. 387-392 (2000)

Koji Aizawa、Takeyoshi Yoshida：“类 Lacolith 岩浆室 - 水下破火山口与花岗岩体之间的接触点”，地球月刊 22, 6. 387-392 (2000)。