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Origin of water in granitic magma.

水在花岗岩岩浆中的起源。

基本信息

批准号：
07640599
负责人：
YAMADA Tetsuo
金额：
$ 1.09万
依托单位：
Shinshu University, Faculty of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640599/
关键词：
granitic magma hornblende biotite hydrogen isotopic ratio chemical composition ラパキビ花崗岩

项目摘要

There are several approaches to study the origin of granitic magma. Our Japanese Group, the leader is Prof. Y.Kuroda, has established the method to explore the origin of water incorporated granitic magma, judging from the relationship between the chemical compositions (X_<Fe>) and hydrogen isotopic ratios (deltaD) of co-existing biotite and hornblende in granitic rocks. We have already investigated many granitic masses from Japan and also from Scandinavian shield and Italian Alps. But some problems have not settled yet.So, we collected many samples from the Miyazu granite in the San'in belt, the Hiroshima granite in the Sanyo belt, and the Tokuwa granite mass in Fossa Magna and analyzed chemically and isotopically. The results are as follows,(1) The Miyazu granite suggest that belongs the equilibrium type in regard to deltaD-X_<Fe> pattern, but the range of X_<Fe> values is widely scattered from 0.3 to 0.8, and deltaD values also ranged from -80 to -130*. This pattern is nearly the sam … More e to the Shirakawa granite in the Hida Mountains. The primary equilibrium relationships between co-existing biotite nad hornblende are seemed to be broken down after the emplacement of the mass by hydrothermal event.(2) the Hiroshima granite shows a very complicated pattern on the deltaD-X_<Fe> diagram, the range of X_<Fe> values of biotite and hornblende are some wide, 0.6-0.85, and many tie-line between coexisting biotite and hornblende on the diagram show the disequilibrium relationship. This characteristics are explained as the isotopic exchange had took place during the hydrothermal events observed in the granite-mass.(3) The Tokuwa mass is composed of magnetite-and ilmenite-series granites. but the slopes of tie-line between co-existing biotite and hornblende from both series are essentially parallel to that derived from Suzuoki-Epstein's experimental work, that is, they show typical equilibrium relationship. The fact is explained that the isotopic equilibration has been held during the crystallization of biotite and hornblende from the magma containning sufficient water, and there is no difference of D/H ratio and temperature in the magma between the magnetite-series and ilmenite-series granites. Less

花岗质岩浆成因的研究有多种途径。以黑田教授为首的日本小组，建立了从花岗岩中共存的黑云母和角闪石的化学成分（X_）与氢同位素比值（δ D）的关系探讨水侵入花岗岩岩浆成因的方法<Fe>。我们已经研究过许多产自日本、斯堪的纳维亚地盾和意大利阿尔卑斯山的花岗岩体。但有些问题尚未解决，因此，我们在山阴带的宫津花岗岩、山阳带的广岛花岗岩和大窝的德川花岗岩中采集了大量样品，进行了化学和同位素分析。结果表明：（1）宫津花岗岩在δ D-X_2模式上属于平衡型<Fe>，但X_2<Fe>值在0.3 ~ 0.8之间分布较广，δ D值也在-80 ~-130之间。这种模式几乎是相同的 ...更多信息与希达山脉的白川花岗岩有着密切的联系。黑云母与角闪石共生的原生平衡关系似乎在热液事件侵位后被打破。(2)广岛花岗岩在δ D-X_2图上显示出非常复杂的图形<Fe>，<Fe>黑云母和角闪石的X_2值范围较宽，为0.6-0.85，图上黑云母和角闪石共存的许多连线显示出不平衡关系。这一特征被解释为同位素交换发生在所观察到的花岗岩体的热液事件。(3)Tokuwa岩体由磁铁矿和钛铁矿系列花岗岩组成。但两个系列中共生的黑云母与角闪石之间的联络线斜率与Suzuoki-Epstein的实验结果基本平行，即它们表现出典型的平衡关系。这说明了黑云母和角闪石在从含水量充足的岩浆中结晶过程中保持了同位素平衡，磁铁矿系列和钛铁矿系列花岗岩的D/H比值和岩浆温度没有差异。少