Talk:Mantle (geology)

Average thickness

The average thickness I've encountered in sismology is 5 KM and not ~2 as mentioned in the article. Which is correct? ÞunoresWrǣþþe (talk) 13:58, 3 February 2017 (UTC)

Add temp schematic

I think this would be suitaible, no? 193.167.228.180 (talk) 08:57, 29 March 2017 (UTC)

I'm all for something that demonstrates the change in temperature with depth, but this one is not clear. The graph shows constant temperature within the inner core, but gives values of 5000 to 7000 K from top to bottom, so that doesn't make any sense. I can't find a graphic that matches the current understanding of temperature changes with depth. Mikenorton (talk) 08:28, 31 March 2017 (UTC)

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Major overhaul needed?

Fellow Wikipedians,

I think this page could benefit from a major overhaul and reorganization. For example, the lead section, which should be a summary of the rest of the article, lists the planets and moons with mantles, but the entire article is only about the Earth. This page should perhaps be about planetary mantles in general, with a (large) section specifically about the Earth, similar to pages on the core and crust. I would be willing to take on an overhaul of this page.

Geo jt (talk) 00:27, 6 November 2018 (UTC)

That makes sense, I would say just go for it. Mikenorton (talk) 08:56, 6 November 2018 (UTC)

Moons with mantles

I don't know enough to answer this question: Do most or some moons have mantles? The answer helps determine what to put in the last sentence of the WP:LEDE. I made this change. Please see my comment. The original sentence did not read well because it was not parallel. I have not found WP:RS to tell me whether the proper modifier should be some, many, etc. If someone with more expertise or someone who knows the WP:RS can help find the best modifier, that would be most appreciated. --David Tornheim (talk) 17:52, 24 November 2018 (UTC)

@David Tornheim: by number of objects most moons are small, undifferentiated bodies. With moons—as usual in the universe at all—bigger objects have a smaller number. Incnis Mrsi (talk) 06:14, 7 August 2019 (UTC)

Calcium Perovskite

I made this change. Is Calcium Perovskite the same as Perovskite? I would like to see the wikilink bring readers to the right place. It wasn't easy to answer from a simple google. --David Tornheim (talk) 18:25, 24 November 2018 (UTC)

See silicate perovskite, it comes in both FeMg (bridgmanite) and Ca varieties. I've updated the link. Mikenorton (talk) 22:01, 24 November 2018 (UTC)

Thanks! --David Tornheim (talk) 06:02, 25 November 2018 (UTC)

This is a subject that always raises confusion. Perovskite is a mineral (calcium titanium oxide), but the word can also refer to the crystal structure typified by the perovskite mineral. There are two lower mantle minerals that bear this structure, which should probably technically be called "calcium silicate perovskite" and "bridgmanite". Bridgmanite used to be called "magnesium silicate perovskite" until 2014, when it was officially named. Calcium silicate perovskite and bridgmanite are "silicate perovskites", a grouping which distinguishes them from the oxide mineral perovskite. Both "bridgmanite" and "calcium silicate perovskite" link to silicate perovskite, which is correct, although I think there should be separate pages for the two, as the are two different minerals. Geo jt (talk) 19:05, 29 November 2018 (UTC)

Uppermost point of the Earth’s mantle

Where does our mantle come closest to the geoid (or MSL)? May it be assumed the same place where the mantle borders the Atlantic Ocean, or very thin pieces of crust may exist closer to the ocean’s surface? Incnis Mrsi (talk) 20:25, 6 August 2019 (UTC)

The Saint Peter and Saint Paul Archipelago exposes mantle peridotites above MSL. Mikenorton (talk) 05:28, 7 August 2019 (UTC)

Is there no crust at all? Presence of some rocks originating [from the mantle] is a weaker condition than actual spatial extent. Volcanoes also “expose” much stuff from the mantle, but in no way are magma chambers etc. deemed parts of the mantle proper. Incnis Mrsi (talk) 05:53, 7 August 2019 (UTC)

No crust, this is an example of exhumed mantle (need to make that a blue link), related to a megamullion. There is exhumed mantle present on many passive margins, due to one particular type of lithospheric break-up mechanism that produces a non-volcanic margin. Mikenorton (talk) 06:37, 7 August 2019 (UTC)