A discussion on determination of Jurassic in the northern part of Yanqi Basin sedimentary boundaries

Aim To discuss the method of ascestaining the basin sedimentary boundaries.Methods Using the three parameters of heavy mineral assemblage of detrital rock,coarse fragment component and mineralogic maturity,the basin sedimentary boundaries will be foun and studied.Results This article gives a detailed research of the characteristics of the heavy mineral assemblage of detrital rock,coarse fragment component,mineralogic maturity and the appearance of their changes according to different transport distance,the basin Sedimentary boundaries are exploringly restored.Conclusion The deposit is regularly changed from provenance to basin along with its transported deposit.Determination of sedimentary boundaries is the effective methord for quantitative research on sedimentary basin.