Volcanic succession at Deception Island, West Antarctica: A revised lithostratigraphic standard

• Main Author: Birkenmajer, Krzysztof
• Format: Article in Journal/Newspaper
• Language: English
• Published: Instytut Nauk Geologicznych 1992
• Subjects: Chacao; Cones The; Cones, The; Deception Island; Hawkes; Kirkwood; Murature; South Shetland Islands; West Antarctica; Antarc*; Antarctica
• Online Access: https://oceanrep.geomar.de/id/eprint/35802/; https://oceanrep.geomar.de/id/eprint/35802/1/KBirkenmajer.pdf; https://oceanrep.geomar.de/id/eprint/35802/2/Karte1.pdf; https://oceanrep.geomar.de/id/eprint/35802/3/Karten23.pdf

New lithostratigraphic Standard is proposed for the Quaternary volcanic succession at Deception Island, South Shetland Islands (West Antarctica). The succession is subdivided into the older Foster Group (redefined group) which includes pre-caldera volcanics, and the younger Hawkes Group (new group) which includes syn-caldera and post-caldera volcanics and volcanic forms. The Foster Group consists of four formations (new units): the Entrance Fm. (basallic and basaltic andesite lavas and pyroclastics); the Cathcdral Fm. (agglomerates); the Stonethrow Fm. (basaltic andesite lavas alternating with agglomerates); and the Window Fm. (trachybasalt dykes). The Hawkes Group consists of seven formations (new units): the Murature Fm. (andesitic lapilli tuff, destroyed ring tephra cones); the Ronald Fm. (trachydacite lava and plug); the Collins F/n. (trachydacite lava flows, tuffs, craters and destroyed cones); the Chacao Fm. (basaltic andesite tephra cones and maars); the Casco Fm. (basaltic andesite tephra cones with craters); the Kirkwood Fm. (basaltic lavas and tephra; fissure eruptions and craters); and the Telefon Fm. (andesitic tephra cones, lavas and tephra cover associated with fissure eruptions, maars). The Telefon Fm. (three phases) relates to the 1967-1970 volcanic activity; the Kirkwood Fm. includes the 1842 event and the events between 1829 and 1912; all older formations pre-date 1829.