File:Anorthoclase crystal from kenyte lava (Late Pleistocene or Holocene; summit cone of Mt. Erebus Volcano, Ross Island, Antarctica) 7.jpg

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English: Anorthoclase crystal from the Quaternary of Antarctica.

Mt. Erebus is the only active volcano in Antarctica. It is a 1.3 million year old, polygenetic stratovolcano in the West Antarctic Rift System. It has erupted basanite, trachyte, tephriphonolite, and phonolite (kenyte) lavas during its history. The summit cone of Erebus has an anorthoclase phenocryst gravel lag, derived from weathering and erosion of kenyte lava, the 2nd-rarest lava type on Earth (Mt. Kenya Volcano in eastern Africa also has kenyte). Kenyte is a porphyritic phonolite having anorthoclase feldspar phenocrysts and a glassy to cryptocrystalline groundmass.

Anorthoclase is a type of feldspar, (Na,K)AlSi3O8) - sodium potassium aluminosilicate. This anorthoclase phenocryst has a coating of weathered, highly vesiculated, glassy kenyte. The lava from which the crystal derives is Late Pleistocene or Holocene in age (I’m not sure which).

Locality: Mt. Erebus Volcano, western Ross Island, Ross Sea, Antarctica (77º 31’ 51” South latidude, 167º 08’ 40” East longitude)
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Source https://www.flickr.com/photos/47445767@N05/53547671782/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/53547671782. It was reviewed on 26 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

26 March 2024

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current16:49, 26 March 2024Thumbnail for version as of 16:49, 26 March 20242,094 × 742 (1.24 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53547671782/ with UploadWizard

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