东秦岭商丹断裂带南侧武关岩群的锆石LA-ICP-MS U-Pb年龄

Zircon LA-ICP-MS U-Pb dating of the Wuguan Group, Shangdan fault zone, eastern Qinling, China. Geological Bulletin of China

摘要: 用LA-ICPMS定年技术测得武关岩群变玄武岩中继承性成因锆石的平均206Pb/238U年龄为348Ma+18/-12Ma。这一年龄代表了继承性锆石受炽热玄武岩浆改造而重结晶的年龄。综合分析认为，武关岩群的时代可能为晚泥盆世。

Abstract: By means of LA-ICP-MS dating, average 206Pb/238U age of the inherited zircons from meta-basalts of the Wuguan Group is 348+18/-12 Ma. This could represent the recrystallization age of the inherited zircon metamorphosed by hot basalt magma, suggesting the Wuguang Group a Late-Devonian stratum.