Samples for detrital component analysis and zircon U-Pb dating were collected from the basal section of Borehole PL02 in the Yinchuan Basin at a depth of 699.9 m. The lithology of this interval is sandstone, and its formation age is constrained to 3.31 Ma based on previous paleomagnetic dating of boreholes in the Yinchuan Basin.
Zircon U-Pb isotopic dating was performed using a Laser Ablation Multi-Collector Inductively Coupled Plasma Mass Spectrometer (LA-MC-ICP-MS) at the Laser Chronology Center, Isotope Geochemistry Laboratory, University of Arizona. Laser ablation was conducted with a Photon Machines Inc. Analyte-G2 ArF 193 nm excimer laser system. The laser spot diameter was set to 30 μm, with helium as the ablation carrier gas and argon as the sensitivity-enhancing makeup gas. Common Pb correction followed the Andersen method, and uncertainties for individual analyses are reported at the 1σ level.
Detrital component statistics were obtained using the Gazzi-Dickinson method for grid-node counting. Over 300 detrital grains per sample were analyzed, with the experiments completed at the Sediment Provenance Analysis Laboratory, University of Milano-Bicocca, Italy.
The zircon U-Pb age results are all filtered for best age and discordance with the following criteria: (1) Best age: if 206Pb/238U<1000 Ma, the 206Pb/238U value is used as the best age; if 206Pb/238U>1000 Ma, the 207Pb/206Pb value is used as the best age. (2) Discordance (discordance) filter: optimal age <1000 Ma, discordance = (207Pb/235U-206Pb/238U)/ 207Pb/235U×100); optimal age >1000 Ma, discordance = (207Pb/206Pb-206Pb/238U)/ (207Pb/206Pb × 100); the optimal age with discordance between -10% and 15% was chosen as the effective age.
Uncertainties for individual zircon U-Pb isotopic analyses are reported at the 1σ level.
| # | number | name | type |
| 1 | 42030505 | National Natural Science Foundation of China | |
| 2 | 41807427 | National Natural Science Foundation of China | |
| 3 | 2021YJJG145 | other | |
| 4 | 20210302124111 | Study on the contribution of soil and water loss in the western foot of Luliang Mountain to the sediment source of different reaches of the Shanxi Shaanxi Gorge of the Yellow River | Shanxi Provincial Project Fund |
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CSTR:11738.11.ncdc.GEOCHEM.db2391.2022
10.12072/ncdc.GEOCHEM.db2391.2022