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Mineral concentrates from the dacite which formed in 1986 give K-Ar 'ages' from 0.34 ± 0.06 Ma (feldspar-glass concentrate) to 2.8 ± 0.6 Ma (pyroxene concentrate). The fundamental dating assumption ('no radiogenic argon was present when the rock formed') is questioned by these data. Helens dacite argue that significant 'excess argon' was present when the lava solidified in 1986.
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After three of these explosive eruptions (June 12, August 7 and October 17), near-surface magma had low enough steam pressures so that viscous lava flows formed three consecutive, dome-shaped structures within the crater.
The first two dacite lava domes built within the crater (late June and early August 1980) were destroyed by subsequent explosive eruptions (July 22 and October 17).
The third dacite lava dome began to appear on October 18, 1980 above the lip of a 25-metre-diameter feeding conduit. Helens' new lava dome is composed of 74 million cubic meters of dacite flows and intrusions built up within the crater between October 18, 1980, and October 26, 1986 The view is toward the north looking over the lava dome into the 1980 blast zone (photo by Lyn Topinka of the US Geological Survey, after Pringle, Ref. After October 18, 1980, this third and newest composite dome of dacite began to appear.