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Petrology and Origin of Ultramfic Xenoliths from North Eastern Jordan Volcanoes

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Author(s): Hassan Al-Fugha | Mazen AL-Amaireh

Journal: American Journal of Applied Sciences
ISSN 1546-9239

Volume: 4;
Issue: 7;
Start page: 491;
Date: 2007;
Original page

Keywords: Alkali olivine basalt | contamination of the basaltic magma | ultramfic xenoliths

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 (

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