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

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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.

Original languageEnglish
Pages (from-to)1215-1219
Number of pages5
JournalChinese Science Bulletin
Volume46
Issue number14
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Almandine megacryst
  • Geochemistry
  • LAM-ICPMS
  • Leizhou Peninsula

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