ژیوشیمی و پتروژنز آلکالی بازالت‎های کواترنری گندم بریان، شمال شهداد، استان کرمان ‏

Gandom-berian area, located on southern part of the kavir-e lut, covers an area around 480 km2 and morphologically is a covered messa by ‎very dark basaltic lava flows. their major minerals are olivine and clinopyroxene phenocrysts along with plagioclase microlites and their ‎main textures are microlitic porphyry to glomeroporphiry with interestal to intergranular groundmass. the in line position of volcanic cones ‎along the line of movements of nayband fault show its effect on the formation of gandom-berian basaltic magma. the genetic realationship ‎of these lava flows with deep seated lithospheric fractures as a result of nayband fault, the presence of mantle xenoliths and alkaline nature ‎of basalt all reveal a fast deep ascending of magmas. based on geochemical analysis and occurrence of nepheline in the norm composition ‎the gandom-berian basaltic lava flows belong to basanite-tephrite group. the investigation on gandom-beriyan alkali basalts clearly shows ‎their relationships to an intera-continental extensional environment. low ratio of ce/nb, th /nb, u/nb, ba/nb and high levels zr with mean ‎‎234.81 indicate a none depleted asthenospheric mantle source the origin of gandom-berian basaltic lava flows. enrichment and depletion of ‎light and heavy rare earth elements respectively indicate the existence of garnet in the source rock. ‎