Post-collisional alkaline intrusive rocks from the Dabie orogen were studied for their whole-rock major-trace elements and Sr-Nd-Hf-Pb isotopes, as well zircon U-Pb ages Hf-O isotopes. The results provide geochemical constraints on nature of mantle sources thus insight into crust-mantle interaction in continental collision zone. are composed syenite nepheline syenite. Syn-magmatic dating by LA-...

Thermal history and apatite fission-track ages were determined for the Kaleybar, Razgah and Bozqush alkaline intrusions which display Eocene-Oligocene stratigraphic age. These subduction-related intrusions are located in the Alborz-Azarbaijan magmatic belt which is characterized by a Paleogene magmatic flare-up associated with extensional/transtensional tectonism. The mean of Uranium content an...

Magnesium isotopes are widely used to trace recycled carbonates in the mantle source. We recently recognized extremely light Mg isotope values (δ26Mg = −0.50 −0.62‰) nepheline syenites Tarim large igneous province (TLIP), NW China. To evaluate significance of isotopes, we conducted petrological, mineral chemical, zircon U-Pb ages, and geochemical (Sr-Nd-Mg) analyses on syenite understand its pe...