Page 221 - Caldera Volcanism Analysis, Modelling and Response

196 W.U. Mueller et al.

Figure 4 Lower formational stage of Hunter Mine caldera (HMC). Arrow indicates top in
photographs. (A) Lobate structure in lapilli tu¡ breccia. Scale, pen 12 cm. (B) Columnar-
jointed felsic lobe with altered hyaloclastite margin. Scale, pen 12 cm. (C) Felsic dyke with
chilled hyaloclastite margin cross-cutting turbiditic tu¡--lapilli tu¡ units and magnetite--jasper
iron-formation. Scale, pen 12 cm. (D) Massive lapilli tu¡ breccia division with rip-ups clasts
of jasper. Scale, pen 12 cm. (E) Hot segregation pipe in massive lapilli tu¡ breccia. Note delicate
Fe-lining at dyke margin and largest clasts in central segment of dyke. Scale, pen 14 cm. (F)
Amoeboid to C-shaped pyroclasts in massive lapilli tu¡ breccia. Scale, white arrow 20 cm.
(G) Strati¢ed lapilli tu¡ division. Scale, pen 14 cm.