Cretaceous provenance changes in the Yishu Rift Basin, east China: implications for the uplift of East Asian coastal mountains
Jiazhen XIANG , Xue GU , Shuo CAO , Laiming ZHANG , Peng CHEN , Chengshan WANG
Front. Earth Sci. ›› 2025, Vol. 19 ›› Issue (2) : 261 -274.
Cretaceous provenance changes in the Yishu Rift Basin, east China: implications for the uplift of East Asian coastal mountains
An early Late Cretaceous NW-SE compressional event that induced the uplift of the coastal mountains was recognized among the overall extensional regime in east China. While previous studies have explored the paleoelevation, paleogeographical extent, and possible climatic effects of coastal mountains, the exact timing of initial uplift has remained elusive. In this study, we applied detrital zircon U-Pb geochronology to sandstones from the Dasheng Group in the Yishu Rift Basin, east China. Our results suggest that the primary provenance of the Dasheng Group is intermediate-basic volcanic rocks (800–500 Ma, 330–215 Ma, and 150–122 Ma) derived from the Luxi Uplift and Sulu Orogenic Belt, and the secondary provenance is Mesoproterozoic-Paleozoic metamorphic rocks (2500–2300 Ma and 1850–1600 Ma) derived from the Jiaobei Terrane. The zircon age peaks of the Dasheng Group in the Yishu Rift Basin are nearly the same as those of the Lower Cretaceous Laiyang Group in the Jiaolai Basin. However, the proportion of pre-Mesozoic zircons decreases. For the Mesozoic zircons, although their main age peak is close to that of the Laiyang Group, their secondary age peak is similar to that of the Wangshi Group. We infer that the transitional characteristic of the Dasheng Group was caused by the initial uplift of the coastal mountains. Therefore, we speculate that the initial uplift of the coastal mountains occurred during the deposition of the Dasheng Group, and limit the maximum depositional age (MDA) of the Dasheng Group to 100–95 Ma.
Dasheng Group / Yishu Rift Basin / Jiaolai Basin / detrital zircon U-Pb geochronology / provenance analysis
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