Growth of the Tian Shan Drives Migration of the Conglomerate‐Sandstone Transition in the Southern Junggar Foreland Basin

The conglomerate-sandstone transition (CST) preserved in foreland basins records the stratigraphic equivalent of gravel to sand (GST) which migrates response shortening steady state orogen-foreland basin systems. Two seismic profiles southern Junggar provide first record migrating CSTs and an opportunity quantify its migration history growth northern Tian Shan. We identify horizontal positions based on distinct signature conglomerate versus sandstone estimate their ages according magnetostratigraphic sections. linear-regression analysis reveals that migrated northward at 0.4 ± 0.1 mm/yr along 84°E from ∼23 ∼6 Ma 4.0 1.2 87°E ∼3.1 ∼0.7 Ma. discrepancy relates variations crustal strike range. Temporal deviations CST suggest second-order impacts climatic change.