Garnet Pyroxenites from Eastern Transylvanian Basin: an Integrated Textural and Geochemical Study

Geolines | January 1, 2006| | Copyright

Since the lower crust and the upper mantle cannot be sampled and studied directly, deep seated xenoliths from basaltic, kimberlitic and lamproitic extrusions provide important information on the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper mantle and lower crustal levels, have been carried to the surface by alkaline basalts extreme rapidly, probably in less then 60 hrs (Kushiro et al. 1976, Mercier 1979).

Petrologically, the mantle xenoliths are mainly peridotites ...

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