Abstract:

A paper entitled“The Jinzi Orogenic Movement and the Carbonate breccia at the base of the Huangmaqing Group in Nanjing area”was published in“Oil& Gas Geology”(1981,Vol.2,No.1),the views presented in this paper arequite different from ours.Since 1970's,we have made a systematic study of the Triassic System,particularly of its breccia in Nanjing area.We consider that this breccia isactually a altered product of gypsum and salt-bearing formation at the top of Qinglong Group.When it was exposed on,or occurred near the surface,the formation was leached by water.As a result,its wall rocks,the intercalationsof sediments themselves,or even the overlying strata were collapsed into frag-ments.Subsequently,it was recemented to become this breccia called a dissol-ved-salt breccia or collapse breccia.Therefore,it is not the product of the“Jinzi Movement”and can not be considered as a“basal conglomerate”ofthe Huangmaqing Group.It is known that gypsum and salt deposits of the Qinglong Group of theTriassic period in the lower reaches of the Yangtze River are distributed with in an area of several ten thousand square kilometers.Based on the occur-rence of surface dissolved-salt breccia,a prediction can be made for the pre-sence of subsurface gypsum and salt deposits.Indeed,this predicion is proved successfuly by nearly one hundred drill holes in this region.