Wikipedia:Featured picture candidates/Volcanic tephra, Antarctica

Volcanic tephra, Antarctica
Voting period ends on 13 Apr 2016  at 22:02:00 (UTC)
 * Reason:High quality, high EV. Image of a large volcanic tephra/pyroclast from an underrepresented geographical area.
 * Articles in which this image appears:Tephra
 * FP category for this image:Natural phenomena/Others
 * Creator:Godot13


 * Support as nominator – Godot13 (talk) 22:02, 3 April 2016 (UTC)
 * Interesting. I'd consider it more useful if we knew the composition. There are quite a few kinds of rock which are linked to volcanism (andesite, for instance, which this does not appear to be). — Chris Woodrich (talk) 23:44, 3 April 2016 (UTC)
 * 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.--Godot13 (talk) 01:37, 4 April 2016 (UTC)
 * Frustratingly, this appears to be the only Brown Bluff specific tephra reference I can find...--Godot13 (talk) 02:13, 4 April 2016 (UTC)


 * Support - Fair enough. I would try asking at Reference desk/Science to see if they can confirm this; if so, we could use the image in the alkali basalt article. — Chris Woodrich (talk) 11:02, 4 April 2016 (UTC)
 * Request for additional info made.--Godot13 (talk) 17:31, 4 April 2016 (UTC)
 * Per information request: "Hard be to certain, but the deposits at Brown Bluff and other locations within the James Ross Island Volcanic Group are mainly formed in lava deltas topped by subaerial lava flows Skilling (2002) erupted into an englacial lake. If this block is part of that, then we're looking at a lump of hyaloclastite breccia, with both clasts and matrix made up of shattered basaltic glass". --Godot13 (talk) 17:59, 4 April 2016 (UTC)
 * Alright, let's not put the image in any rock articles. — Chris Woodrich (talk) 23:23, 4 April 2016 (UTC)
 * Support - good enough quality, interesting, even though EV slightly lacking per above. --Janke | Talk 12:29, 4 April 2016 (UTC)
 * Support – nice details. Bammesk (talk) 01:27, 6 April 2016 (UTC)
 * Comment There's a number of small, thin light lines at about this angle: / in the upper right. Are they meant to be there? Adam Cuerden (talk) 01:53, 7 April 2016 (UTC)
 * Adam - Between the light drizzle/snow (appearing suddenly, then vanishing) and occasional wind-blown debris I think it's all natural. Shows up best against the upper right black, but it is distributed all across the top of the background--Godot13 (talk) 02:15, 7 April 2016 (UTC)
 * Alright. Support then. Adam Cuerden (talk) 02:16, 7 April 2016 (UTC)
 * Support – Jobas (talk) 17:36, 11 April 2016 (UTC)

--Armbrust The Homunculus 22:03, 13 April 2016 (UTC)
 * Added it to Featured pictures/Sciences/Geology instead. Armbrust The Homunculus 22:03, 13 April 2016 (UTC)