FILLING OF GULLIES BY EOLIAN SAND-A POSSIBLE GENESIS OF SANDSTONE VEINS (DIKES AND SILLS)

A great number of gullies have been recognized in the Huanghe River delta.These gullies range in depth from several cm to more than 1 m(usually tens of cm),in width from several cm to several m(usually ten cm or so),and in length from a few decades of cm to twenty m or so (usually several m).They also have diverse morphologies:erect tabular-flaky,vertical wedge-shaped,"⊥"-and "U"-shaped,trapezoidal and dendritic forms,which are usually filled by eolian sand and then turned into sandstone veins (dikes and sills) through diagenesis.The author interpretes the sand filling of alluvial gullies as a possible genesis of sandstone veins (dikes and sills) in the study area.