Cr-poor megacrysts from the Shamah volcanic field, northwestern part of the Arabian Plate

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Megacrysts are common in alkali basalt of Quaternary age in the northeastern Harrat Shamah basalt fields of Jordan. The dominant phases are Al-clinopyroxene, Al-bronzite, pleonaste spinel and kaersutite amphibole. The megacrysts differ in composition from analogous phases in associated lherzolite xenoliths, but are similar to those in associated Al-augite pyroxenite xenoliths. Major and trace element partioning indicates that most of the megacrysts may have been in equilibrium with their host magmas at high pressure.

Original languageEnglish
Pages (from-to)349-357
Number of pages9
JournalJournal of African Earth Sciences
Issue number3
Publication statusPublished - 1995


ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geology

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