Detrital zircon U-Pb ages and Hf isotope analyses of modern and Quaternary sediments in China
Chen Xiyun;Wang Ping;Xie Hongsen;Zhu Longchen;Liao Xia
Detrital zirconU-Pb agesHf isotopemodern sedimentChina
Here, we publish a new recorded detrital zircon dataset of modern and Quaternary sediments in China with 59,535 U-Pb ages and 4,971 Hf isotope data. Four types of sediments have been classified here according to sedimentary environments, including fluvial, marine, aeolian and alluvial sediments. There are three data spreadsheets, one is for the metadata (Supplemental Table 1 for U-Pb samples) and the other two are for signal grain data (Supplemental Table 2 for U-Pb ages; Supplemental Table 3 for Hf analyses). The metadata spreadsheet includes information about samples, such as sampling location (GPS), publication sources and lithology. The single grain spreadsheets include data of 206Pb/238U, 207Pb/235U and 207Pb/206Pb ratios and ages (with 1 sigma uncertainty), and Hf isotope for zircon grains. Metadata and single grain spreadsheets are linked through DOI_Sample Key, which could provide a unique identifier for each sample. For single grain U-Pb ages, we recalculate the relevant ages of the compiled initial ratio data and calculate concordia ages (Vermeesch, 2021) with IsoplotR (from AK to AS). In addition, we use the 1000 Ma as the cut-off to calculate a “Best Age” for all grains except for those have no ratios or ages (Gehrels et al., 2008) (from AT to AV). The single-grain epsilon Hf values are also recalculated by 176Hf/177Hf ratio with respect to the ratio of chondritic uniform reservoir (CHUR) (0.282772, Blichert-Toft & Albarède, 1997), where the 176Lu decay constant is 1.867×10-11 year-1 (Söderlund et al., 2004). For better management of the dataset, further efforts could include the entry of the latest literature data and the further inspection of published data.
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Chen Xiyun;Wang Ping;Xie Hongsen;Zhu Longchen;Liao Xia.Detrital zircon U-Pb ages and Hf isotope analyses of modern and Quaternary sediments in China.DDE Repository.2022-11-03.doi:10.12297/dpr.dde.202211.2