Geochemical characteristics of the Permian marine mudstone and constraints on its provenance and paleoenvironment in the Fenghai area, Fujian Province, southeastern China

摘要: Permian marine strata have gradually become a research focus in the world. The of Late Dalong Formation (P3d) Fenghai area, Fujian Province, more and important as their geochemical characteristics record geological information are good indicator for recovering reconstructing paleo-sedimentary environments tectonic attributes. major elements, trace elements rare earth were analyzed by XRF ICP-MS, respectively. Based on results detailed field surveys, profile measurements well typical sample collection, setting provenance mudstone comprehensively discussed. showed that was deposited an active continental margin environment revealed relation between Fe2O3 + MgO TiO2 Al2O3/SiO2. fingerprint Mn, Fe, Co, Ni REE ratio U/Th, V/Cr, Sr/Ba, (La/Yb)N V/(V + Ni) indicated sedimentary mainly derived from potassium feldspar, followed muscovite. Sedimentary water bodies decreasing depositional rate trend, depth shallowing paleo-salinity productivity increasing. Moreover, since transient delamination occurred during processes, obvious neritic characteristics. It consistent with lithological Calcareous siltstone transitioned into fine sandstone bottom to top, indicating paleo-water became shallow. provided reference guidance understanding attributes Yong’an southeastern China.