U-Pb Zircon Geochronology from Volcanic Ash Beds in the Umbria-Marche Sedimentary Succession of Central Italy

Abstract: This dataset contains CA-ID-TIMS U-Pb zircon data from 11 volcanic ash beds from the Umbria-Marche sedimentary succession in central Italy. This includes data from volcanic ash beds previously dated using the 40Ar/39Ar method (biotite, multigrain fractions) from Massignano (Rupelian GSSP) and Monte Cagnero (proposed Chattian GSSP). The data demonstrate that previous radio-isotopic dating of the Massignano and Monte Cagnero records gave anomalously old results, and thereby eliminates the ca. 0.6 Myr discrepancy observed between radio-isotopic and astronomically tuned time scales of the Oligocene in the 2012 edition of the Geological Time Scale.

Other Description: Sahy, D., Condon, D.J., Hilgen, F.J., Kuiper, K.F., (2017), "Reducing Disparity in Radio-Isotopic and Astrochronology-Based Time Scales of the Late Eocene and Oligocene." Paleoceanography, 32(10):1018-1035

摘要：本数据集包含源自意大利中部翁布里亚-马尔赫沉积序列11个火山灰层的化学蚀痕-同位素稀释热电离质谱铀-铅锆石（CA-ID-TIMS U-Pb zircon）定年数据。其中涵盖了此前采用氩-40/氩-39（40Ar/39Ar）定年法（针对黑云母、多晶组分）对马西尼亚诺（Massignano，鲁培尔阶全球界线层型剖面和点位（GSSP））以及蒙特卡涅罗（Monte Cagnero，渐新统恰特阶候选全球界线层型剖面和点位（GSSP））开展定年所涉及的火山灰层数据。本数据表明，此前针对马西尼亚诺与蒙特卡涅罗记录的放射性同位素定年结果存在异常偏老的问题，由此消除了2012版《地质年表》中渐新世放射性同位素定年与天文调谐时间尺度之间约0.6百万年的差异。

其他说明：Sahy, D.、Condon, D.J.、Hilgen, F.J.、Kuiper, K.F.（2017），"缩减始新世晚期与渐新世放射性同位素定年与天文年代标尺的差异"，《古海洋学（Paleoceanography）》，32(10):1018-1035