Hornblende 40Ar-39Ar data from debris from the basal ice of the Byrd ice core, central West Antarctica

This dataset comprises of hornblende 40Ar/39Ar ages. Hornblende grains were picked from debris melted from three intervals of basal ice from the Byrd ice core. We include data for all 129 40Ar/39Ar dated hornblende grains, but note that only ages when an 5.0E-18 Mol 39Ar threshold was exceeded are considered reliable (n = 33) and that data from grains with less than 1.5E-17 Mol 39Ar should be interpreted with caution. The ice core the debris was extracted from was drilled at 80° 0.1'S, 119° 31.0'W at Byrd Station, West Antarctica, in January 1968.本数据集包含角闪石的40Ar/39Ar测年数据。实验所用角闪石颗粒提取自伯德冰芯（Byrd ice core）三段底冰融蚀得到的碎屑。本数据集收录了全部129颗经40Ar/39Ar测年的角闪石颗粒数据，但需注意：仅当39Ar的摩尔量超过5.0×10^-18摩尔的阈值时，测年结果才被视为可靠（有效样本量n=33）；而颗粒的39Ar摩尔量低于1.5×10^-17摩尔的数据则需谨慎解读。该碎屑所提取自的冰芯，于1968年1月在西南极洲伯德站（Byrd Station）的80°0.1'S、119°31.0'W位置钻取完成。