The hydrothermal formation of sulphides and sulphosalts at low temperatures (< 100�)

Thallium diagenesis in lacustrine sediments

“…In the other panels, the symbols are the IAP values and the vertical dotted lines are the solubility products of Tl 2 S (s) (log K s ϭ Ϫ7.19; panels b and f), greigite (log K s ϭ Ϫ13.2; panels c and g) and troilite (log K s ϭ Ϫ5.25; panels d and h); the other vertical lines in panels d and h are for amorphous FeS (log K s ϭ Ϫ2.95), mackinawite (log K s ϭ Ϫ3.6) and pyrrhotite (log K s ϭ Ϫ5.1). The solubility products for the iron sulfide solids are from Davison (1991). occurs naturally in pyrites (Nriagu, 1998), and that mixed Fe and Tl sulfide minerals can be synthesized under laboratory conditions (Elhaddad and Moh, 1992;Wang, 1993) provide evidence for the affinity of Tl for Fe sulfides. Also, Thomson et al (1992) reported that Tl(I) has a strong affinity for Fe sulfide clusters.…”