Mantle xenoliths in a nephelinite the Little Lottery River provide insight into Miocene mantle adjacent to Australia-Pacific plate boundary N Canterbury. The comprise peridotite and pyroxenite extracted from depths of ∼ 40 60 km. olivine Mg# < 89, lack spinel occurrence ilmenite, elevated bulk Cr Al, light rare Earth element (REE)-enriched clinopyroxene, 87Sr/86Sr15 Ma clinopyroxene populations...

A suite of mafic pyroxenite xenoliths and clinopyroxene megacrysts was brought to the surface by Cenozoic nephelinites Jbel Saghro Volcanic Field (Anti-Atlas, Morocco). The large population samples subdivided into five groups: (i) clinopyroxenites sensu stricto; (ii) olivine clinopyroxenites; (iii) mica-bearing (iv) kaersutite-bearing (v) megacrysts. These display a cumulate texture (adcumulate...

To investigate the process and chemistry of mineral reaction zone formation, we conducted detailed petrographic observations chemical analysis rocks minerals spinel lherzolite xenoliths from basanites Tumusun volcano (Baikal Rift Zone). The zones gradually disappear contact toward center xenoliths. influence basanite melt on major trace element composition secondary is notable only at a distanc...

In the Cheshmeh-Bid district of Khajeh-Jamali ophiolitic massifs (Southern Iran), mantle peridotites are intruded by abundant pyroxenite dykes. A few these dykes remarkable for occurrence native copper associated with development a metasomatic reaction zone. The progressively reacted, from their margins towards center, an amphibole + antigorite selvage, followed centimeter-thick clinopyroxene a...

The Dinaride Ophiolite Belt formed from the Jurassic part of Neotethys. investigated Ozren ophiolite complex in Bosnia and Herzegovina consists peridotites, plagioclase plagiogranites, troctolites other gabbroic rocks, fewer basalts. Lherzolites harzburgites contain corroded ortho- clinopyroxene1 porphyroclasts enclosed olivine matrix. boundaries between aggregates pyroxene1 spinel1 are infille...