id author title date pages extension mime words sentence flesch summary cache txt g732d793z8h Wei Chen Deciphering Mantle Sources and Petrogenetic History of the Oka Carbonatite Complex, Québec, Canada 2014 .txt text/plain 268 10 34 The overall distribution of ages indicates that alnöite was intruded first, followed by okaite and carbonatite, whereas ijolite defines a bimodal emplacement history. In-situ U-Pb ages for apatite, perovskite and niocalite define a ~15 Myr protracted history of magmatic activity. cache/g732d793z8h.txt txt/g732d793z8h.txt