Does the "Guangxi-type granite" have any petrological significance? ——A critique on "Geochemistry of the Guangxi-type granite and its tectonic implications"
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    Abstract:

    Based on the compilation of 30 cases around the world, the author holds that the so-called "Guangxi-type granite" does not contain the petrological and geodynamic significance as argued by Zhang Qi (2014), who has proposed the nomenclature. The Sr and Yb enriched "Guangxi-type granites" are composed of intermediate to acid and peralkaline rocks in lithology, and most of them exhibit negative Eu anomalies. From the perspective of rock association (series), the so-called "Guangxi-type granite" is actually the mingling of calc-alkaline, alkaline, and A-type granite. In fact, the "Guangxi-type granite" can be generated by many petrogenetic mechanisms, including the fractional crystallization or assimilated fractional crystallization (AFC) of mafic magma, and the partial melting of crustal sources, with the plagioclase as one of the crystallization or residual phases. The comparison of the phase diagrams from fluid-absent melting of common crustal source rocks shows that 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. Accordingly, the "Sr-Yb" classification of granitic rocks proposed by Zhang Qi is useless for geodynamic study.

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汪洋,2015,“广西型花岗岩”有岩石学意义吗?——对《广西型花岗岩的地球化学特征及其构造意义》一文的质疑[J].岩石矿物学杂志,34(3):427~439. WANG Yang,2015,Does the "Guangxi-type granite" have any petrological significance? ——A critique on "Geochemistry of the Guangxi-type granite and its tectonic implications"[J]. Acta Petrologica et Mineralogica,34(3):427~439.

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History
  • Received:December 22,2014
  • Revised:January 05,2015
  • Adopted:
  • Online: May 29,2015
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