<p>Basically, a fertile mantle is a portion of mantle that has not experienced any melting. On the other hand, a depleted mantle has experienced partial melting, and subsequent extraction of this melt. During partial melting, some elements will preferably go in the melt while others will preferably stay in the mantle. This leaves the residual mantle with a different chemical/mineral composition, which is more refractory, i.e., less likely to melt.</p>
<p>So &quot;fertile&quot; here means &quot;can (partially) melt&quot;, while &quot;depleted&quot; means &quot;cannot melt (because already did)&quot;. Corresponding mantle rocks are usually lherzolite and harzburgite, respectively. See for instance the <a href="https://en.wikipedia.org/wiki/Peridotite#Classification" rel="nofollow noreferrer">peridotite classification</a> article on Wikipedia:</p>
<blockquote>
<ul>
<li>Harzburgite [...] is interpreted as depleted mantle rock, from which basaltic magma has been extracted.</li>
<li>Lherzolite is thought to make up much of the upper mantle [...] and is the likely source rock for basaltic magma.</li>
</ul>
</blockquote>

CC BY-SA 4.0
2022-07-26T19:19:37.383Z
2022-07-26T19:24:45.127Z
2022-07-26T19:24:45.127Z
Jean-Marie Prival
<p>In a paper about the interior of the Moon, it references depleted mantle sources and enriched mantle sources. Sometimes the latter is referred to as 'fertile'. What is difference between the first two?</p>

CC BY-SA 4.0
2022-07-27T21:27:55.797Z
(Wouldn't be bad to add a link to the paper, just for interest of people reading, though probably no big deal if it's not fairly at hand)
JeopardyTempest
<volcanology><planetary-science><mantle><moon><magmatism>
What is the difference between a depleted mantle, and a fertile or enriched mantle?
Andy
# What is the difference between a depleted mantle, and a fertile or enriched mantle?

(Asked by: username_0 on 2022-07-26)

In a paper about the interior of the Moon, it references depleted mantle sources and enriched mantle sources. Sometimes the latter is referred to as 'fertile'. What is difference between the first two?

**Tags:** volcanology, planetary-science, mantle, moon, magmatism

> **Comments:**
> **username_1**: (Wouldn't be bad to add a link to the paper, just for interest of people reading, though probably no big deal if it's not fairly at hand)  

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## 1 answers

### Answer by username_2 on 2022-07-26. Score: 4 | Accepted answer

Basically, a fertile mantle is a portion of mantle that has not experienced any melting. On the other hand, a depleted mantle has experienced partial melting, and subsequent extraction of this melt. During partial melting, some elements will preferably go in the melt while others will preferably stay in the mantle. This leaves the residual mantle with a different chemical/mineral composition, which is more refractory, i.e., less likely to melt.

So "fertile" here means "can (partially) melt", while "depleted" means "cannot melt (because already did)". Corresponding mantle rocks are usually lherzolite and harzburgite, respectively. See for instance the [peridotite classification](https://en.wikipedia.org/wiki/Peridotite#Classification) article on Wikipedia:

> * Harzburgite [...] is interpreted as depleted mantle rock, from which basaltic magma has been extracted.
> * Lherzolite is thought to make up much of the upper mantle [...] and is the likely source rock for basaltic magma.


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