Page 214 - Caldera Volcanism Analysis, Modelling and Response

Characterisation of Archean Subaqueous Calderas in Canada 189

Figure 3 Characteristics of the subaqueous Hunter Mine caldera (HMC).Tip of pen indicates
top. (A) Silici¢ed mudstone (shale) at the interface with the komatiitic Stoughton-Roque-
maure Group. (B) Jasper--magnetite raft in chaotic breccia located at inferred caldera margin
wall. Scale pen 13 cm. (C) Graded bedded (GB) tu¡--lapilli tu¡. Scale pen 13 cm. (D) Archean
pumice with feldspar phenocryst in GB tu¡--lapilli tu¡ unit. Note quartz-¢lled vesicles. (E)
Synvolcanic N-trending fault with £uid migration in GB tu¡--lapilli tu¡s. Scale pen 12 cm.
(F) Margin of N-trending ma¢c dyke with white and black chert at brecciated margin.
Location: near top of succession at inferred caldera wall margin.