206Pb/238U CA-ID-TIMS dating of zircons from volcanic tuffs of the White River Group

206Pb/238U CA-ID-TIMS dating of zircons from volcanic tuffs intercalated in the White River Group, sampled at Flagstaff Rim, Wyoming, and Toadstool Geologic Park, Nebraska. The aim of the study was to establish the timing of environmental change associated with the Chadronian/Orellan transition in N America, relative to the marine record of the Eocene/Oligocene transition, and the onset of early Oligocene Antarctic glaciation.

本数据集涵盖采自美国怀俄明州弗拉格斯塔夫岭（Flagstaff Rim）与内布拉斯加州托德斯特尔地质公园（Toadstool Geologic Park）的、夹层于怀特河群（White River Group）火山凝灰岩（volcanic tuffs）中的锆石（zircons）的206Pb/238U化学研磨同位素稀释热电离质谱（CA-ID-TIMS）测年数据。本研究旨在明确北美地区查尔顿期/奥雷兰期（Chadronian/Orellan）过渡期相关的环境变化时序，并以始新世/渐新世（Eocene/Oligocene）之交的海相记录与早渐新世南极冰盖启动事件的时间序列为参照，建立该环境变化时序与上述两类地质记录之间的对应关联。