Brown Bluff-2016-Tabarin Peninsula–Volcanic tephra

Autor:

Godot13

Credit:

Praca własna

Krótki link:

https://plwiki.pl/b/113265

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Wikimedia Commons

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3848 x 3125 Pixel (13621108 Bytes)

Opis:

Block of tephra, at Brown Bluff, Tabarin Peninsula, Antarctic Peninsula. To give an idea of scale, the height at the center of the object is at least 6 ft (1.8 m). Per Skilling, I. P. (1994). Evolution of an englacial volcano: Brown Bluff, Antarctica. (not publicly available on line, and I was only able to read the first two pages), it appears to be "alkali basaltic" in composition (at least the Brown Bluff tephra in general appears to be), I think this is referring to the darker solid chunks contained in the lighter matrix material.

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CC BY-SA 4.0

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Creative Commons Attribution-Share Alike 4.0