2010/06/21 by Adam P. Martin, Alan F. Cooper · 3 citations
Earth and Planetary Sciences · #Geology and Paleoclimatology Research #Geological and Geochemical Analysis #Geological formations and processes #Geology #Rift #Paleontology #Seismology #Structural basin
paper · doi:10.1017/s095410201000026x
openalex publication_date 2010/06/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21
Abstract A hawaiite dyke dated at 3.88 ± 0.05 Ma from the Mount Morning eruptive centre intrudes a diamictite deposit at Gandalf Ridge in the southern Ross Sea. The dyke has been dextrally offset up to 6 m horizontally by faults interpreted as the onshore continuation of the West Antarctic rift system (WARS) fault array. Felsic dykes emplaced during the Miocene are also present at Gandalf Ridge. The offset of the Miocene dykes is equivalent to the offset on the hawaiite dyke, suggesting that at this locality movement on faults within WARS has been restricted to a period more recent than c . 3.88 Ma. Over this period the minimum average rate of movement on these faults within WARS is 0.0015 mm yr -1 .