Fig. 7

Tera-Wasserburg concordia diagrams of (A) pre-ore calcite (Cal-1); (B) pale-yellow sphalerite (Sp1)-related calcite (Cal-2); (C) Rb–Sr isochron diagram for brown sphalerite (Sp2); (D) Tera-Wasserburg concordia diagram of yellow–brown sphalerite (Sp2)-related calcite (Cal-3).