有关埃达克岩实验应用中几个问题的探讨
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  • 英文篇名:A tentative discussion on the experimental study of adakite
  • 作者:张旗
  • 英文作者:ZHANG Qi;Institute of Geology and Geophysics, Chinese Academy of Sciences;
  • 关键词:实验研究 ; 埃达克岩 ; 花岗岩 ; 石榴石 ; 斜长石 ; 部分熔融
  • 英文关键词:experimental research;;adakite;;granite;;garnet;;plagioclase;;partial melting
  • 中文刊名:YSKW
  • 英文刊名:Acta Petrologica Et Mineralogica
  • 机构:中国科学院地质与地球物理研究所;
  • 出版日期:2015-03-25
  • 出版单位:岩石矿物学杂志
  • 年:2015
  • 期:v.34;No.154
  • 基金:国家自然科学基金重大研究计划资助项目(91014001)
  • 语种:中文;
  • 页:YSKW201502012
  • 页数:14
  • CN:02
  • ISSN:11-1966/P
  • 分类号:129-142
摘要
实验研究非常重要,是花岗岩(和埃达克岩)理论创新的源泉之一。近年来,国内在埃达克岩实验研究方面取得了很大的成绩。在这个领域,中国在国际上是处于领先水平的,虽然得到的认识并不相同,这是很正常的。本文讨论了与埃达克岩有关的一些实验研究问题,认为:1下地壳底部是缺水的,花岗岩是在缺水条件下部分熔融的,应当慎重对待在饱和水和有水加入情况下的实验结果。2要注意残留相组分中是否有斜长石出现,不能只关注石榴石,石榴石与斜长石配合起来才能得出正确的认识。3 1.0 GPa压力下石榴石出现线的真实含义是什么?它只表明与之平衡的熔体是贫Yb的。但是,贫Yb的花岗岩不只是埃达克岩,喜马拉雅型花岗岩也贫Yb,因此,还需要考虑斜长石消失的情况,如果石榴石出现而斜长石消失了,熔体是埃达克岩;如果石榴石出现而斜长石没有消失,则熔体为喜马拉雅型花岗岩。由于国外没有喜马拉雅型花岗岩的概念,因此,对国外某些在1 GPa条件下得到的实验资料应当仔细鉴别,也许其中有一些熔体并非埃达克岩,而是喜马拉雅型花岗岩。4相变反应不同于部分熔融反应,不能把相变反应的结果解释为部分熔融的结果。相变反应是在温度压力增加的情况下发生的,不是产生花岗岩的主要方式;部分熔融反应主要是在温度增加压力不变的条件下发生的,是产生花岗岩的主要方式。5实验研究得出的一个重要的结论是:与榴辉岩平衡的熔体是埃达克岩,因此,埃达克岩的真谛可能就是非常简单的一句话:源区有石榴石无斜长石。只要符合这个标志,与其平衡的熔体必然是高Sr低Yb的;只要符合这个标志,与其平衡的熔体必然是在较高的压力下形成的。高压可能就是埃达克岩最重要的构造意义。
        Experimental researches constitute one of the sources of the innovation of granite and adakite theory and hence play an essential role in this aspect. In recent years, researchers in China have made great achievements in granite and aidakite experimental research. This paper discusses some experimental researches on issues related to adakite and puts forward some opinions: 1 The bottom of the lower crust lacks water, the dehydration partial melting of granite is under the condition of less water, and hence the experimental results should be treated with caution in the case of saturated water and increased water; 2 Attention should be paid to the problem whether there appears plagioclase in the residual phase component or not, and the consideration of both garnet and plagioclase can lead to a correct conclusion; 3 What is the real meaning of garnet-in line under 1. 0 GPa pressure? It only suggests that the melt balance with garnet-in has lower Yb. However, besides adakite, Himalayan type granite also has lower Yb, and therefore the emergence of plagioclase should also be considered: if garnet appears but plagioclase disappears, the melt is adakite; if both garnet and plagioclase appear, the melt is the Himalayan type granite. Researches abroad fail to consider Himalayan-type granite, and hence some experimental data under the condition of 1 GPa provided by foreign researchers should be used carefully, because some of the melts belong to the Himalayan type granite instead of adakite; 4 The metamorphic reaction is different from the partial melting reaction. The metamorphic reaction result cannot be interpreted as the result of partial melting reaction. The metamorphic reaction occurs in the case of increasing temperature and pressure and is not the main way to produce granite; the partial melting reaction that occurs under the constant pressure and increasing temperature is the main way to produce granite. The author emphasizes that the recent experimental study of adakite conducted by researchers in China has made great progress, and China is at a leading level in the world in this field. The difference in opinions is inevitable and normal.
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