[1] 刘英俊等，1979，地球化学，北京，科学出版社，514,
[2] 刘英俊等，1984，元素地球化学，北京，科学出版社，548,
[3] 李石，1991,鄂北地区碱性岩的时代与成因，岩石学报，(3) :27-36,
[4] 杨光荣等，1986，四川南部上二叠统划分与含煤性，重庆出版社，153.
[5] 周瑶琪等，1991,混合成因模式，地质论评，V. 37 (1) : 51-63.
[6] Brouoz, A. and Spears, D. A.，1985，Influence of water depth on the alteration process of cinerites in thesedimentary basin-importance of Pedogenesis. 10th Congr. Int. Strat. Geol. Carbon.，C. R., 4 : p. 183-187.
[7] Burger, K.，Zhou, Y. and Tang, D.，1990, Synsedimentary volcanic ash-derived illite tonsteins in Late Permian coal-bearing formations of southwestern China. Int. J. Coal Geol.，15:p. 341-356.
[8] Dopita, M. and Kralik, J.，1977,Coa1 tonsteins in Octrava-Karvina coal basin. CSSR,Octrava, p. 213
[9] Plant et al.，1988. Developments in regional geochemistry for mineral exploration. Trans. IMM, SEC. B, Vol.97.
[10] Spars, D. A. and Kanaris-Sotiriou, K.，1975，Titanium in some Carboniferous sediments from Great Britain. Geochem. Cosmechem. Acta,40(3);p. 345-351.
[11] Zhou, Lei and Kyte Frank T.，1988，The Permian-Triassic boundary event:a geochemical study of three Chinese sections. Earth and Planetary Science Letters, V. 90, No. 4, p. 411-421.
[12] Zhou;Y.，Ren,Y. and Bohot,B.F.，1982,Origin and distribution of tonsteins in Late Permian Coal fields of southwestern China. Int. J. Coal Geol.，2:P 49-77.
[13] Zhou, Y., Burger, K. and Tang, D.，1987，A study on tonsteins in Late Permian Coal fields of southwest China. 11th Int. Congr. Strat. Geol. Carbon.,Abstr. pap.,I;p. 273.
[14] Zhou,Y.,Ren,Y. and Tang,D.，1992. Characteristics of Zircons from volcanic ashderived tonsteins Late Permian Coal fields of eastern Yunnan，China.