Deep buried sandstones of Lower Cretaceous in North Songliao Basin are compositionally immature lithic arkose and feldspathic litharenite. The main diagenesis of the sandstones includes:authigenetic clay rim

quartz and feldspar overgrowth

albitization

authigenetic laumontite and the dissolution of feldspar and laumontite. The albitization of anorthosite is the primary mechanism for generating laumontite

whereas the transformation of clay minerals provides sodium and silicon for the precipitation of laumontite.