Figure F62. Three complex intrusive contacts. A. Composite dike (interval 309-1256D-155R-1, 83–90 cm). Chilled margin forms a convex lobe, indicating that the host rock was still ductile during the intrusion. B. An inner sparsely phyric dike intrudes a sparsely phyric spherulitic chilled margin, which is different from the aphyric host rock (interval 309-1256D-161R-2, 0–8 cm). Therefore, in this piece, two subsequent intrusive contacts have been recorded. C. Lobate, brecciated contact of an external chilled margin with small dispersed clasts of the host rock (interval 309-1256D-163R-1, 112–122 cm).
Previous | Close | Next | Top of page