Page 142 - Caldera Volcanism Analysis, Modelling and Response
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Case Study of the Abrigo Ignimbrite, Tenerife, Canary Islands 117
Figure 5 Photographs of: (a) aphyric basalt, (b) pale grey intermediate clast, (c) porphyritic
phonolite, and (d) mottled phonolite; and photomicrographs of textural variations in felsic
volcanic lithic clasts: (e) equigranular mosaic groundmass (crossed polars), (f) bow-tie and
fan spherulites (crossed polars), (g) ma¢c (clinopyroxene/amphibole-rich, Maf) and felsic
(clinopyroxene/amphibole-rich-poor, Fel) domains (ppl) and (h) groundmass of curved and
branching feldspar microlites (crossed polars).
