| “广西型花岗岩"的地球动力学意义——答汪洋(2015)的质疑 |
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| 引用本文： | 张旗.“广西型花岗岩"的地球动力学意义——答汪洋(2015)的质疑[J].岩石矿物学杂志,2015,34(3):440-444. |
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| 作者姓名： | 张旗 |
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| 作者单位： | 中国科学院 地质与地球物理研究所, 北京 100029 |
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| 基金项目： | 国家自然科学基金重大研究计划项目资助(91014001) |
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| 摘 要： | 汪洋撰文批评笔者提出的"广西型花岗岩"没有任何意义,认为花岗岩类的全岩Sr、Yb含量不是指示花岗质岩浆起源压力的可靠指标,以Sr-Yb为基础的花岗岩分类没有地球动力学意义。笔者认为,花岗岩可以形成于不同的压力条件下不是笔者的发明,国外早有论述,例如Defant和Drummond(1990)关于埃达克岩和岛弧ADR的认识。汪洋认为,花岗质岩浆可以形成于下地壳部位,也可以形成于中地壳深度,还认为基性岩浆分离结晶可以形成花岗质岩浆,这都是笔者不赞同的,因为缺乏野外证据。广西型花岗岩以富Sr和Yb为特征,指示在相图上位于石榴石出现线之下和斜长石消失线之上,暗示残留相既无石榴石也无斜长石。汪洋引用了不同地区不同作者对广西型花岗岩成因的不同见解,与笔者关于广西型的概念没有任何关系,也不能据此否定笔者关于广西型花岗岩的认识。
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| 关 键 词： | 广西型 花岗岩 压力 分类 评论 |
| 收稿时间： | 2015/1/9 0:00:00 |
Geodynamic significance of "Guangxi-type granite": Answer the question from Wang Yang(2015) |
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| ZHANG Qi.Geodynamic significance of "Guangxi-type granite": Answer the question from Wang Yang(2015)[J].Acta Petrologica Et Mineralogica,2015,34(3):440-444. |
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| Authors: | ZHANG Qi |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Wang Yang wrote a critique arguing that "Guangxi-type granite" does not contain the petrological and geodynamic significance, the whole-rock Sr and Yb content of granitic rocks cannot be regard as a reliable index to indicate the melting pressure of granitic magma, and the "Sr-Yb" classification of granitic rocks is useless for geodynamic study. The author indicates that granites were formed under different pressures, like adakites and arc magmatic rocks (andesite-dacite-rhyolite). Wang Yang thinks that granitic magma can be formed either in the lower crust or in the middle crust, and also believes that granitic magma can be formed by basic magma fractional crystallization. Because of the lack of field evidence, the author does not agree with these arguments. The Sr and Yb enriched Guangxi-type granites indicates that there is no garnet and plagioclase in residual phases. Wang Yang quotes different opinions from different scholars, but these opinions have nothing to do with the concept of the Guangxi-type granites proposed by the author. Therefore, Wang Yang fails to deny the author''s understanding concerning Guangxi-type granite based on his arguments. |
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| Keywords: | Guangxi-type granite pressure classification review |
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