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Deciphering Late Quaternary stratigraphy in a marine setting using CPTu data: insights from Northern Fujian; China
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DOI：10.3389/fmars.2026.1909600.png)
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Abstract
En 中文
The Late Quaternary stratigraphy of the inner shelf along the southeastern China coast remains poorly resolved because of the reliance on sparse borehole data. Here; we integrate 54 downhole CPTu soundings with borehole logs achieving penetration of ~110 m; together with a ~78 m sediment core (LJ01) recovered from the offshore area in Northern Fujian; capturing a near-complete; high-resolution stratigraphic record. The calibrated CPTu responses enable robust facies discrimination and reveal three vertically stacked successions that define the regional stratigraphic architecture in the Xiapu offshore area. Succession 1 (MIS 6–5) is dominated by fluvial channel belts overlain by an aggrading floodplain system; recording a transition from sediment bypass to increased accommodation. Succession 2 (MIS 4–3) comprises fluvial–tidal river deposits passing upward into transitional floodplain–tidal flat and estuarine bay facies; reflecting increasing marine influence during relative sea-level rise. Succession 3 (MIS 2–1) is characterized by transgressive reworked deposits capped by offshore/prodelta sedimentation; indicating the establishment of inner-shelf conditions during the Holocene transgression. This stratigraphic organization links facies stacking directly to glacio-eustatic cycles and demonstrates that calibrated CPTu datasets can resolve long; continuous subsurface records in data-limited inner shelf settings; providing a transferable framework for Late Quaternary coastal stratigraphic analysis.
Keywords:
stratigraphy
sedimentary facies
East China Sea (ECS)
Late Quaternary
piezocone penetration test (CPTU)
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