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Description
"Herbert Peak Hawaiite (8.5 – 8.0 Ma)
After a period of quiescence, volcanic activity shifted from Lyttelton Volcano to the Mt
Herbert region . During this period, there was deep erosion in the
crater, with breaches in the southeast, and possibly, southwest crater rim and slopes of
the Lyttelton Volcano edifice. The Mt Herbert Volcanic Group (9.7 – 8.0 Ma)
initially began from vents in the Lyttelton crater and then migrated south-eastwards to
the crater rim breach, erupting ~100km 3 of material.
Lava erupted from a vent 50 m southeast of Mt Herbert, producing flat lying, columnar to
tabular jointed, grey aphyric to phyric hawaiites that cap Mt Bradley and Mt Herbert
dipping to the north at 2° noted low ash abundance,
indicating activity was dominantly of Hawaiian-type, from a fissure vent eruption. The
characteristic thick columnar jointed flows is linked to extrusion of lavas onto an almost
flat lying surface"
Hampton, S. J. (2010) https://ir.canterbury.ac.nz/handle/10092/4117 p13
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