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LI Xinglong, SI Rongjun, MAO Guangyu, et al. Genesis and Geological Significance of Waijushan Neo-archean Pluton in Songshan Area[J]. Northwestern Geology, 2016, 49(1): 50-60.
Citation: LI Xinglong, SI Rongjun, MAO Guangyu, et al. Genesis and Geological Significance of Waijushan Neo-archean Pluton in Songshan Area[J]. Northwestern Geology, 2016, 49(1): 50-60.
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Genesis and Geological Significance of Waijushan Neo-archean Pluton in Songshan Area

  • School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, Henan, China

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  • Received Date: December 02, 2014
  • Revised Date: August 12, 2015
  • Published Date: March 04, 2016
    Graphical Abstract
    • Abstract
  • Songshan is the typical area in China, where the neo-archean granitic rocks were well exposed. The Waijushan gneissic trondhjemite is mainly distributed in Waijushan, which shows grayish-white colour, with medium-grained granitic texture, gneissic and banded structures. The Waijushan gneissic trondhjemite has high concentrations of Na2O (4.08%~5.30%) and SiO2 (average 65%), and poor in Fe and Mg, with high ratio of Na2O/K2O (1.5~3.9) and the content of Al2O3 of 14.14%~17.44% (average of 15.33%, larger than 15%), showing the feature of TTG gneiss with peraluminous. It has the similar geochemical characteristics with the high Si Cenozoic adakite, for example, the ΣREE is 121×10-6~267×10-6, the HREE is strongly depleted, and the LREE and HREE are strongly differentiation, with weak negative Eu anomalies, high content of Sr, high ratio of Sr/Y, and low contents of Cr, Yb and Y; It is also similar to island arc volcanics on the relational features among Nb, Y, Rb, Th, La and Yb in the rocks. The geochemical characteristics of the Waijushan pluton shows that it was formed by the partial melting of aqueous basaltic oceanic crust under the high pressure environment during subduction process.
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