Abstract A comprehensive petrological study and age dating of a young clinopyroxenite–gabbro–hornblendite series intruded deformed dunites, clinopyroxenites, and tilaites of the Kytlym mafic–ultramafic massif have been carried out. The convergent 40 Ar– 39 Ar age of amphibole from clinopyroxenite and U–Pb isotope data of zircons from melanocratic gabbro correspond to 415 Ma and indicate that the termination of ultramafic magmatism in the Ural Platinum Belt took place in the Early Devonian.

中文翻译：

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乌拉尔铂带超镁铁质岩浆作用终止时间

摘要 对一个年轻的单斜辉石-辉长岩-角闪长岩系列侵入了 Kytlym 基性-超镁铁质地块的变形纯英岩、单斜辉石岩和钛铁矿进行了全面的岩石学研究和测年。单斜辉石岩角闪石的收敛 40 Ar– 39 Ar 年龄和黑晶辉长岩锆石的 U-Pb 同位素数据对应于 415 Ma，表明乌拉尔铂带中超镁铁质岩浆活动的终止发生在早泥盆世。