Ol Doinyo Lengai (ODL, Tanzania, East African Rift) is the only known volcano currently erupting carbonatite on Earth with 30 yr. cycles alternating between quiescent effusion and explosive, compositionally-zoned silicate eruptions. We performed isothermal crystallization thermal gradient experiments involving ODL nephelinite, Na 2 CO 3 H O to understand magmatic differentiation in this system ...

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...

Abstract Mosonik, a 3.25 Ma extensively dissected stratovolcano located in the North Tanzanian Divergence of East African Rift, consists predominantly phonolite and three types phonolitic nephelinite distinguished by presence or absence amphibole garnet antecrysts differing populations complexly zoned antecrystal phenocrystal pyroxenes. The antecryst–phenocryst assemblage is typical hybrid lava...