Quaternary Jinsha River reversal and upper Yangtze integration based on multi-proxy evidences from sediments in the southeastern Tibetan Plateau
Description
This dataset contains the detrital zircon U-Pb ages, trace elements, and heavy mineral data used in the manuscript.
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Data Collection and Methodology: This dataset comprises heavy mineral assemblages, detrital zircon U-Pb ages, and trace element concentrations obtained from Quaternary sediments in the Qiaojia Basin. The data were acquired and processed through the following standardized workflow: 1. Heavy Mineral Analysis: Samples were dried (<60 °C), washed, and sieved to extract the 63–250 μm fractions. Heavy minerals were concentrated using bromoform (density = 2.89 g/cm³) and magnetic separation. Transparent heavy minerals were identified and counted (n > 600 per sample) under a polarizing microscope following standard criteria. 2. Zircon Separation and Preparation: Zircon grains were extracted using diiodomethane (density = 3.32 g/cm³) and a Frantz magnetic separator. To avoid selection bias, grains were non-selectively picked, mounted in an epoxy plug, polished, and subjected to Cathodoluminescence (CL) imaging to examine internal structures. 3. LA-ICP-MS Analysis: Simultaneous U-Pb dating and trace element analyses were performed using an NWR193UC 193 nm excimer laser system coupled with an Agilent 7900 ICP-MS. The laser spot diameter was 30 μm with a repetition rate of 6 Hz. Each spot was pre-ablated with 5 laser pulses to remove surface contamination. Zircon GJ-1, 91500, Plešovice, and NIST SRM 610 were used as reference materials for calibration and monitoring. 4. Data Processing and Software: Raw analytical data were processed off-line using ICPMSDataCal software (Liu et al., 2008, 2010). Only zircon ages with <10% discordance were retained in this dataset.
Institutions
- Chengdu University of TechnologySichuan, Chengdu