Feldspar 40 Ar/ 39 Ar dating of ICDP PALEOVAN cores

Paleoenvironmental and paleoclimatic variations around Lake Van (Eastern Turkey) recorded by sedimentary source specific biomarkers 250–130 ka (MIS7 and MIS6)

“…All chronological data from Lake Van, including the age model, are illustrated and published in Stockhecke et al (2016). The age model was confirmed recently with new 40 Ar/ 39 Ar measurements on tephra from 133 ka to 251 ka revealing consistent inverse isochronal ages of five volcanoclastic layers (V-81, V-111, V-145, V-149 and V-185; Engelhardt et al, 2017).…”

Evolution of diagenetic conditions and burial history in Buntsandstein Gp. fractured sandstones (Upper Rhine Graben) from in-situ δ18O of quartz and 40Ar/39Ar geochronology of K-feldspar overgrowths

“…These chips were irradiated at the CLICIT facility of the Oregon State TRIGA Reactor (OSTR) at Oregon State University together with the sanidine age standard, FC3 (27.5 ± 0.2 Ma; Uto et al 1997), from the Fish Canyon Tuff standard from the Geological Survey of Japan, focusing on K 2 SO 4 and CaF 2 salts. Details on the irradiation procedure at OSTR can be found in Engelhardt et al (2017). Ar isotope analyses by in-situ laser ablation were performed on K-feldspar detrital grains and overgrowths, with a UV pulse laser (wavelength of 266 nm) of the New Wave Research DualWave laser in most cases with 20-40 µm diameter and maximum energy of 0.3 mJ to ablate parts of the mineral.…”