1972/03/01 by R.V. Dingle, R. I. Gentle · 1 citation
Earth and Planetary Sciences · #Geological formations and processes #Geological and Geophysical Studies #Geological Studies and Exploration #Geology #Igneous rock #Augite #Continental shelf #Geochemistry #Intrusion #Oceanography #Paleontology #Plagioclase
paper · doi:10.1017/s0016756800039510
openalex publication_date 1972/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
Summary Tuffs, trachybasalts, aegirine–augite trachytes and aegirine–augite phonolitic trachytes occur on the continental shelf at the southern tip of Africa. They have been radiometrically dated at 58(±2.4) million years (Palaeocene), and together with other alkali-rich basic intrusions onshore form the Alphard Tertiary Igneous Province. Both onshore and offshore sites of intrusion appear to be strongly tectonically controlled.