Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China

Figure 4

The macroscopic geological characteristics with the change of purple to light grey in Dayao copper deposit. (a) 074DB-29 point: the boundary line between the purple sandstone and the light grey sandstone in bottom of in Shimenkan. Silicified and alteration happened in light grey sandstone side and it made the purple sandstone fade; (b) MK16: the boundary line of purple under the bedding and light grey above the bedding because of the hydrothermal metasomatism along the bedding, the color on the plate, and fracture into light grey to grey; (c) 96 m of ZK1503-1 drill: the transition between the purple fine sandstone and the greyish green fine sandstone in , pyrite mineralization in greyish green fine sandstone; (d) ZK15103: the transition of purple and light grey and the mineralization characteristics (left: purple sandstone; middle: transition of purple and light grey; and right: grey black ore).

(a)

(b)

(c)

(d)