Quartz and clinoenstatite exsolutions in clinopyroxene of garnet-pyroxenolite from the North Dabie Mountains, eastern China

The exsolution lamellae of quartz and clinoenstatite are idenfied in diopsi de of garnet-pyroxenolite from the North Dabie Mountain by transmission ele ctron microscopy, which is Interpreted that the lamellae are originally exs olved from a former ultra-high-pressure clinopyroxene due to decreasing of pressure. Study of petrography shows that there is compositional zoning in the diopside itself. It is implied that the garnet-pyroxenolite had undergo ne intensive high-temperature granulite facies and high-amphibolitic facies retrogressive metamorphism, while the peridotite (the garnet-pyroxenolite' s host rock) emplaced the crust.