Fig. 3

Representative textures of 1961 lava flow; white scale bar in field images is 1 m; yellow scale bar in thin section scans is 0.5 cm, red boxes indicate locations of photomicrographs; red scale bar for photomicrographs (4 × magnification) is 0.5 mm. ‘pl’ = plagioclase; ‘cpx’ = clinopyroxene. A Vent scoria textures from E vent facing N with oxidized spatter and scoria. B Thin section scan of IIAU15-001, from the S face of E vent, exhibits both end-member vent textures. C Photomicrograph of IIAU15-001 showing a single plagioclase microphenocryst surrounded by a glassy microlite-rich groundmass. D Clinkery and blocky event 1 aʻa on transect F at the S lobe, facing SE. E Thin section scan of IIAU18-001, taken from the bottom of an aʻa levee at the end of transect A. F Photomicrograph of IIAU18-001 containing a microphenocryst of plagioclase and microphenocrysts of pyroxene. G Blocky event 2 aʻa taken at start of the N lobe at transect E near branching point 2 (I.A. Ukstins for scale). H Thin section scan of IIAU15-023, sampled from the flow front of the middle lobe. I Photomicrograph of IIAU15-023 with a plagioclase microphenocryst surrounded by a groundmass of plagioclase, pyroxene, olivine microlites, and glass. J Shelly and ropey event 2 pahoehoe photographed on the middle lobe at transect A facing N. K Thin section scan of IIAU15-011 sampled 1 km from the vents. L Photomicrograph of IIAU15-011 with microphenocrysts of pyroxene and glomerocrysts of pyroxene and plagioclase. M Shelly pahoehoe from the 3rd event on the W halo finger photographed at transect B. N Thin section scan of sample IIAU15-016, from the lava flow interior of the W halo finger. O Photomicrograph of IIAU15-016 with a large glomerocryst of plagioclase and pyroxene