Sedimentary Provenance Analysis of Palaeocene in the X Sag, East China Sea Shelf Basin

Abstract

The analysis of sedimentary provenance characteristics is the premise of sedimentary system analysis. At present, the understanding of sedimentary provenance is not unified in the exploration and development of Lishui Sag. To solve this problem, in this paper, we used the clastic components composition and the major element oxides to analyze the tectonic setting in provenance area, the analysis of paleogeomorphology, heavy minerals, mudstone color index and paleocurrent indicated by seismic reflection characteristics were used to analyze the provenance direction. Through the analysis of clastic components composition, it is considered that the provenance of Paleocene sedimentary system in the X sag mainly comes from the areas of Recycled Orogenic, Dissected Arc and Transitional Arc, and the analysis of major element oxides shows that the provenance tectonic setting and type of Paleocene sedimentary system in the X sag is mainly active continental margin and island arc, these two conclusions are basically consistent. The paleogeomorphology, heavy minerals, mudstone color index and seismic reflection characteristics analysis shows that the provenance direction in the sedimentary period mainly comes from the west, southwest of Minzhe Uplift and East of Yandang Uplift. Different provenance areas provide substantial sediments basis for the development of sedimentary facies in the study area.