The origin and evolution of garnet pyroxenite xenoliths from the Upper Cretaceous volcanoes of Mt Carmel, Israel Academic Article uri icon

abstract

  • A suite of rare mantle pyroxenite xenoliths occurs within Upper Cretaceous mafic pyroclastic sections at Mt. Carmel, northern coastal Israel. The suite includes clinopyroxenites with abundant garnet and some spinel, suggesting crystallization conditions of~ 1.5 GPa and 110oC. Petrographic examination reveals at least three crystallization stages:(1) a relict magmatic assemblage indicated by cm sized garnet xenocrysts,(2) a major metamorphic assemblage represented by medium grained spinel-bearing garnet clinopyroxenite xenoliths (3) a third assemblage of plagioclase, orthopyroxene and spinel occurs in keliphytic rims around garnet in all Grt-bearing samples and indicates a retrograde granulite facies overprint. The Carmel xenoliths show highly variable contents of HREE, but little change in LREE suggesting that they formed by fractional crystallization as cumulates …

publication date

  • January 1, 2011