VOLCANIC GEOLOGY OF MOUNT EREBUS, ROSS ISLAND, ANTARCTICA

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概要

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• Mount Erebus is an active volcano located on Ross Island, Antarctica, in an intraplate extensional tectonic setting. Reconnaissance geologic mapping has shown Mt. Erebus to be composed predominantly of anorthoclase phonolite lava flows and associated pyroclastic rocks. At the surrounding areas of Fang Ridge, Dellbridge Islands, Turks Head and Cape Barne, the lava flows and various pyroclastic deposits are predominantly intermediate in composition. Most of the lavas from Erebus and surroundings are strongly undersaturated and sodic, forming a continuous differentiation lineage consisting of basanite, Ne-hawaiite, Ne-mugearite, Ne-benmoreite and anorthoclase phonolite. These lavas are termed the Erebus lineage (EL) and are predominantly coarsely porphyritic with a similar phenocryst assemblage consisting of olivine, clinopyroxene, opaque oxides, feldspar, apatite and rare feldspathoids.EL lavas are distinctly different from the lavas of the three predominantly basanite volcanic centers which radially surround Mt. Erebus (DVDP lineage; P.R. KYLE : J. Petrol., 22,451,1981), and must have a different petrogenesis. Very minor volumes of less undersaturated benmoreite, phonolite and trachyte occur on Mt. Erebus and must also have evolved independently of the EL.

• 国立極地研究所の論文

著者

• Kyle P.r.

  Department Of Geoscience New Mexico Institute Of Mining And Technology

• MOORE J.A.

  Department of Geoscience, New Mexico Institute of Mining and Technology

• Moore J.a.

  Department Of Geoscience New Mexico Institute Of Mining And Technology

関連論文

• MICROSTRUCTURE AND PHASE TRANSITION OF CALCIC ANORTHOCLASE FROM MOUNT EREBUS, ANTARCTICA
• VOLCANIC GEOLOGY OF MOUNT EREBUS, ROSS ISLAND, ANTARCTICA

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