Page 195 - Volcanic Textures A Guide To The Interpretation of Textures In Volcanic Rocks

7. Mineralized and altered pumice breccia
Relict primary textures can be preserved even in
extremely altered volcanic rocks. At the margin of a
massive sulfide lens at Hercules, massive chlorite
(black; C), massive pods of quartz-sericite-carbonate
(cream; P) and semi-massive spotty galena-sphalerite
(pale grey; O) have replaced diffusely planar
stratified pumiceous rocks. Relict tube pumice
textures are locally preserved in the altered and
mineralized pumiceous host rocks in both outcrop
and thin-section.

Mount Read Volcanics, Cambrian; 4-Level road,
Hercules mine, western Tasmania.

180