Cosmogenic 3 He exposure ages and geochemistry of basalts from Ascension Island, Atlantic Ocean

• Published in: Quaternary Geochronology
• Main Authors: Ammon, K., Dunai, T.J., Stuart, F.M., Meriaux, A.-S., Gayer, E.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2009
• Subjects: Gough; Mid-Atlantic Ridge; St. Helena; Tristan; South Atlantic Ocean
• Online Access: http://eprints.gla.ac.uk/78119/

The chronology and origin of volcanism of Ascension Island, South Atlantic Ocean, is poorly resolved. Here we use in situ produced cosmogenic 3He in olivine and pyroxene phenocrysts from well-preserved lava flows to date the main sub-aerial basalt volcanism on the island. Etching olivine separates i...