Research Article Open Access

Petrology and Origin of Ultramfic Xenoliths from North Eastern Jordan Volcanoes

Hassan Al-Fugha1 and Mazen AL-Amaireh1
  • 1 ,
American Journal of Applied Sciences
Volume 4 No. 7, 2007, 491-495

DOI: https://doi.org/10.3844/ajassp.2007.491.495

Submitted On: 3 March 2007 Published On: 31 July 2007

How to Cite: Al-Fugha, H. & AL-Amaireh, M. (2007). Petrology and Origin of Ultramfic Xenoliths from North Eastern Jordan Volcanoes. American Journal of Applied Sciences, 4(7), 491-495. https://doi.org/10.3844/ajassp.2007.491.495

Abstract

The distribution of major, minor and trace elements in the Cenozoic alkali basalt from north-eastern Jordan indicates a homogeneous lava flow from a mantle source. These basaltic rocks contain abundant upper mantle xenoliths (spinal lherzolite, harzburgile and olivine- websterite). Theses xenoliths contain olivine, orthopyroxne, clinoporoxene and a few amounts of spinal. Their mineral assemblages, chemistry, texture and major elements abundances indicate they were derived and equilibrated under upper mantle conditions within temperature range for 970-1090°C. Pressure estimates based on the spinal lherzolite stability field restrict the xenoliths source depth to around 65 km. The concentrations of incompatible trace elements (Ba, Rb and Sr.) imply a derivation from ultramafic predictive source from the upper mantle with low degree of melting (<20%). Low concentration of Lithium and Rubidium in the basalt is used as an argument against the contamination of the basaltic magma during its journey to the surface.

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Keywords

  • Alkali olivine basalt
  • contamination of the basaltic magma
  • ultramfic xenoliths