From greenhouse to icehouse – the Eocene/Oligocene in Antarctica

摘要: The AU :10 change from a warm, ice-free greenhouse world to the glacial Antarctic icehouse occurred during latest Eocene–earliest Oligocene. Prior this, Early–Middle Eocene, Antarctica experienced warm climates, at least on margins of continent where geological evidence is present. Climates appear have been and wet, seas were plants flourished in frost-free environment, although there some suggestion valley glaciers King George Island. Climate signals record show that climate then cooled but not enough allow existence significant ice until Eocene. Glacial deposits Seymour Island indicate was present Eocene/Oligocene boundary times. Further south Ross Sea region, icerafted clasts drill cores tidewater glacier origin Prydz Bay confirm presence continental shelf by earliest This matches major Oi-1 oxygen isotope event marine record. On land, 1 3 5