Late Permian–Middle Triassic magnetostratigraphy in North China and its implications for terrestrial-marine correlations

A detailed magnetostratigraphic study, linked to a new latest Permian U–Pb ID-TIMS age, was undertaken on the continental Shichuanhe section (SCH) in North China order provide magnetic polarity scale for Late Permian–early Middle Triassic interval. Tilt-corrected mean directions of characteristic remanent magnetization pass reversal test and correspond site paleolatitude 18.1°N during Early Triassic, consistent with previous results from Block. The magnetostratigraphy shows close similarity studies, allowing interregional correlations both marine non-marine records. Normal magnetozone SCH3n, constrained by an absolute age 252.21±0.15 Ma ash bed 3.5 m below its base, is unambiguously correlated earliest normal magnetochron LT1n. Our newly established framework published carbon-isotope chemostratigraphy, indicate that Permian–Triassic Boundary ca. 8 above base SCH3n (within middle part Sunjiagou Formation) at SCH. overlying reverse dominated interval (SCH3r–SCH5r) ranges Liujiagou Formation, straddles mid-Griesbachian mid-Smithian. Olenekian provisionally located lower near SCH5n. succeeding thick SCH6n persists into upper Heshanggou inferred Smithian–Spathian boundary Formation. transition SCH6r SCH7n, coincides clear erosional contact Ermaying Consequently, SCH7n matched Anisian MT3n, Olenekian–Anisian missing. timescale provides additional constraints timing terrestrial ecological crisis China, which found lie within SCH2r (equivalent LP3r), level some 270±150 kyrs before main extinction, falls