Detrital zircon data of DYZ borehole

Detrital zircons were concentrated by conventional magnetic separation and heavy-liquid methods and hand-picked under a binocular microscope. Zircons with diameters of 40–300 μm (mostly >100 μm) were selected to minimize potential input from eolian deposits. U–Pb dating was carried out at the Chronology Laboratory, Tianjin Geological Survey Center (China Geological Survey), using laser-ablation multi-collector inductively coupled plasma mass spectrometry (LA–MC–ICP–MS) with a laser spot diameter of 32 μm. For zircons younger than 10 Ma, ages were calculated from 238U/206Pb ratios; for zircons older than 10 Ma, ages were calculated from 207Pb/206Pb ratios. Grains with concordance <98% were excluded.采用常规磁选法与重液法对碎屑锆石进行富集，并在双目显微镜下手工挑选。选取粒径40–300 μm（多数>100 μm）的锆石，以尽可能降低风成沉积带来的潜在干扰。 铀-铅（U-Pb）测年工作在中国地质调查局天津地质调查中心年代学实验室完成，采用激光剥蚀多接收器电感耦合等离子体质谱仪（LA–MC–ICP–MS）进行测试，激光束斑直径为32 μm。对于年龄小于10 Ma的锆石，通过238U/206Pb比值计算其年龄；对于年龄大于10 Ma的锆石，则通过207Pb/206Pb比值计算其年龄。剔除谐和度低于98%的测试颗粒。