Terrigenous grain size (sortable silt) and detrital provenance (Hf, Nd, Pb/Pb) data, Eocene-Oligocene, Newfoundland ridges drifts, IODP Sites 342-U1406 and 342-U1411

This dataset consists of terrigenous grain-size data from Integrated Ocean Drilling Program (IODP) Sites 342-U1406 and 342-U1411 and lithogenic isotope (Hf, Nd, Pb/Pb) data from IODP Site 342-U1411. These two sites are in the Newfoundland ridges contourite drift complex and were cored during IODP Expedition 342 (Paleogene Newfoundland Drifts) in summer 2012. The grain-size data consists of 137 samples from Site 342-U1406 and 192 samples from Site 342-U1411 and was measured with a Micromeritics SediGraph 5120 particle size analyzer. The Hf and Nd data consists of 30 samples from Site 342-U1411 and were measured using a ThermoFisher Neptune multi-collector inductively coupled plasma mass spectrometer (MC-ICPMS). The Pb/Pb data consists of 23 samples from Site 342-U1411 were also measured using a ThermoFisher Neptune MC-ICPMS. All data were generated between the years 2014 and 2019. The timespan of the data set is from ~35 Ma to 26 Ma (9 Myr total duration). Sample resolution ranges and is up to one sample per 10-15 kyr during the Eocene-Oligocene Transition (EOT; 33.65-34.44 Ma) and intervals immediately prior (35-34.44 Ma) and immediately after (33.65-32.5 Ma). Sortable silt metrics (abundance and mean) were calculated from the grain-size data and used to reconstruct bottom-current and paleocirculation history. The lower-resolution lithogenic isotope data is used to infer sediment source (provenance) changes across the EOT.本数据集涵盖综合大洋钻探计划（Integrated Ocean Drilling Program, IODP）342航次U1406站位与U1411站位的陆源粒度数据，以及IODP 342航次U1411站位的陆源同位素（Hf、Nd、Pb/Pb）数据。上述两个站位位于纽芬兰脊等深流沉积复合体，于2012年夏季随IODP第342航次（古近纪纽芬兰漂移沉积）完成岩心钻探。粒度数据共计包含U1406站位137个样品、U1411站位192个样品，采用Micromeritics SediGraph 5120型粒度分析仪完成测试。Hf与Nd同位素数据包含U1411站位的30个样品，使用ThermoFisher Neptune型多接收电感耦合等离子体质谱仪（multi-collector inductively coupled plasma mass spectrometer, MC-ICPMS）完成测定。Pb/Pb同位素数据包含U1411站位的23个样品，同样采用ThermoFisher Neptune MC-ICPMS完成测试。所有数据的产出时间为2014年至2019年。本数据集的时间跨度约为35 Ma至26 Ma（总时长9 Myr）。样品分辨率在始新世-渐新世过渡期（Eocene-Oligocene Transition, EOT；33.65~34.44 Ma）及其紧邻前后时段（35~34.44 Ma与33.65~32.5 Ma）可达每10~15 kyr一个样品。研究人员从粒度数据中计算得到可分选粉砂参数（丰度与平均值），以此重建底流与古环流演化历史。低分辨率的陆源同位素数据则用于推断始新世-渐新世过渡期的沉积物物源变化。