Referential significance of sulfur isotopes and separation of S species inblack shales of Southwest China

The states of S species in black shares are very complex,such as organic su lfur, pyrite sulfur and sulphate sulfur, The mineral microtexture, sulfur c ontent and sulfur isotope can indicate the formation conditions and diagene tic processes of the black shales. The S species are separated perfectly an d the relation between the content, mineral microtexture and sulfur isotope composition of the sulfur mineral is assessed. These complementary approac hes provide people a new insight into the formation conditions of the black shales and redox conditions of Precambrian and Cambrian in Southwest China .