[1] (1) 徐永昌,沈平,陶明信,孙明良,1990,科学通报,12期,932-935页.

(2) 徐永昌,沈平,申歧祥,徐胜,1986,研究年报,86-105页,甘肃科学技术出版社.

(3) 唐修义,杨宜春,刘冬梅,沈平,申岐祥,1987,研究年报,242-252页.甘肃科学技术出版社.

(4) 魏菊英,王关玉,1988,同位素地球化学,97-111页.地质出版社.

(5) Gould K. W. and Smith J. W., 1979, the genesis and isotopic composition of carbonates associated with some Permian Australian Coals. Chem.Geol. 24, p.137-150

(6) Weber J.N., Williams F.G.and Keith, M.L., 1964, Paleoenvironmental significance of carbon isotopic composition of siderite nodules in some shales of Penn-sylvanian age.J.Sediment.Petrol., 34, p.814-818.