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Almandine megacrysts from Yingfengling Cenozoic basalt in Leizhou Peninsula and their parental magma origin

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Chinese Science Bulletin

Abstract

The garnet megacrysts from Yingfengling basalts are characterized by high FeO (>20%), CaO (7.02% –8.16%) and low MgO (5.88%–10.87%). Significant composition variations are observed in these megacrysts, of which Ni, V, Sc, Co, and HREE are positively correlated with their Mg#, and Zr, Hf, Ga, Y, Sr, Nb, Zn and LREE-MREE are negatively correlated with Mg#. Megacryst parent magma is a highly evolved residual melt with strongl depletion in Ti, Sr, Hf, Nb and HREE. This parental magma was generated by more than 60% of crystallization fractionation of clinopyroxene, garnet, plagioclase and ilmenite from quartz tholeiitic magma. It has not erupted to the surface, but stayed at the upper mantle and formed the megacrystic cumulate. Megacrysts and their host basalt are in disequilibrium.

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Authors and Affiliations

  1. National Key Laboratory of Metallogenic Mechanism of Endogenetic Deposits, Department of Earth Sciences, Nanjing University, 210093, Nanjing, China

    Jinhai Yu

  2. National Key Center of GEMOC, Department of Earth and Planetary Sciences, Macquarie University, 109, North Ryde, NSW, Australia

    S. Y. O’Reilly

Authors
  1. Jinhai Yu
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  2. S. Y. O’Reilly
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Yu, J., O’Reilly, S.Y. Almandine megacrysts from Yingfengling Cenozoic basalt in Leizhou Peninsula and their parental magma origin. Chin.Sci.Bull. 46, 1215–1219 (2001). https://doi.org/10.1007/BF02900606

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  • DOI: https://doi.org/10.1007/BF02900606

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