genesis of the high gamma sandstone of the yanchang formation in the ordos basin, china: a reply

 

the authors of ‘genesis of the high gamma sandstone of the yanchang formation in the ordos basin, china’ questioned the viewpoint that high-gamma-ray sandstone might be caused by homochronous sedimentary volcano tuff ash or previous tuff. the authors argued that the main reason for the high-gamma-ray sandstone should be from high th and u contents in zircon. in reply, we discuss the problems with the authors from the category of high-gamma-ray sandstones, rock characteristics, and possible sources of radioactivity. the results still indicate that the high gamma ray characteristics might be caused by homochronous sedimentary volcano tuff ash or reworked previous tuffs.