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Metamorphism and partial melting in lower crust and development of continent

下地壳变质作用和部分熔融与大陆发育

基本信息

批准号：
02453048
负责人：
TAGIRI Michio
金额：
$ 3.07万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02453048/
关键词：
Partial melting Migmatite Granitic rocks Crustal material 部分溶融

项目摘要

In this study, we presented a great number of chemical data of volcanics, metamerphics and granitics including trace metal contents and REE contents. Tagiri indicated the following results in his papers. In the Hidaka Lower crust, first, S-type granitic magma formed in terms of batch melting of pelitic gneiss, segregated completely from host and ascended to upper crust. Next, I-type granitic magma formed in terms of partial melting of basic gneiss, segregated partially from host, ascended to upper crust and intruded into S-type granites. Moreover, Tagiri described LithoLogicaL column of continental crust which is very similar to a seismological column of continental crust.Takahashi indicated three evolutions of magma-plumbing system beneath Fuji volcano based on a great number of geochemical analyses. A : the mantle diapirs with different source, signatures uprised successively. B : the convection within a single heterogeneous mantle diapir produced diversity of source basalt magmas. C : the melting of different portions of upper mantle is the cause for the diversity of source basalt magma. He also indicated chemical cat inhomogeneity of upper mantle.Fujinawa studied two types of magma series, one is the tholeiitic magma series and the other the calc-alkaline one. Two magma series were derived from different sources. Tholeiitic magma series were derived from mantle origin primary basalt magma. However, calc-alkaline magma series are not only solely explained by fractional crystallization but also mixing of magnesian magma and assimilation of anatectic melt originated from lower crustal amphibolite.

在这项研究中，我们提供了大量的火山岩、变质岩和花岗岩的化学数据，包括微量金属含量和稀土元素含量。Tagiri在他的论文中指出了以下结果。在日达卡下地壳，首先是泥质片麻岩批量熔融形成的S型花岗岩浆，与寄主完全分离，上升到上地壳。基性片麻岩部分熔融形成的I型花岗岩浆，与寄主部分分离，上升到上地壳，侵入S型花岗岩中。此外，Tagiri描述了非常类似于大陆地壳地震柱的大陆地壳岩性柱，Takahashi基于大量的地球化学分析指出了富士火山地下岩浆-管道系统的三次演化。答：不同来源的地幔底辟，签名相继抬升。B：单一非均质地幔底辟内的对流作用产生了不同来源的玄武岩岩浆。C：上地幔不同部分的熔融是源区玄武岩岩浆多样性的原因。藤川研究了两种岩浆系列，一种是拉斑玄武岩系列，另一种是钙碱性岩浆系列。两个岩浆系列来自不同的来源。玄武岩岩浆系列来源于地幔成因的原生玄武岩岩浆。然而，钙碱性岩浆系列不仅可以用分离结晶作用来解释，还可以用镁质岩浆混合和下地壳角闪岩深熔熔体的同化作用来解释。