Petrology of Ti Point Group, Northland, New Zealand 

Heming, R. F. 

1980 

 

 

Article in journal 

Lavas of the late Miocene Ti Point Group are found as scattered flow remnants, a dike, and a sill. Most are basalts with olivine phenocrysts set in a groundmass of clinopyroxene and plagioclase. One flow remnant is a glassy andesite and the relationship of this rock to the basalts is unknown. Together they are interpreted as the remains of a basaltic lava field which lay along the east coast of Northland between Ti Point and Mangawhai. The basalts belong to distinctive alkali-rich and alkali-poor groups similar to the Quaternary volcanic fields of Auckland and Northland. (auth) 

 

nzms262 03; petrology; volcanism; ti point group; upper miocene; nzms260r09; Biogeophysical; northland; basalts