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A fact from El Laco appeared on Wikipedia's Main Page in the Did you know column on 17 June 2016 (check views). The text of the entry was as follows:
Did you know... that the El Laco volcano in Chile has erupted enigmatic iron-rich lava flows?
It will be great to review one of your volcanoes again. Cheers, Sainsf(talk·contribs) 06:52, 5 June 2016 (UTC)Reply
General
I see some duplinks. You can fix them yourself by this tool.
Lead
Citations are generally excluded from the lead unless you are saying something controversial.
Geology
What is "poryphyric"?
What is "metasomatic alteration"?
Iron-rich deposits
Try adding some subheadings
These iron oxide deposits were found in 1958 By?
Petrology
The iron-containing rocks are subordinate Can you add what exactly "subordinate" means here?
You can try combining a few lines using semicolons.
crustal contamination or isotopic effects during fractional crystallization Wikilinks possible?
Some atmospheric water influence Does this mean "influence of atmospheric moisture"?
Link sulfur at first mention
What is "hydrothermal alteration" (if you link this, link at first mention in the article) and "alteration halo"?
Environment
Can you explain a bit about "low bushland"? Bushland may be linked, but some readers may not understand "low"
The prose reads well and is quite interesting. Those were all my comments. Cheers, Sainsf(talk·contribs) 06:52, 7 June 2016 (UTC)Reply
Sainsf Not sure about whether cites in the lead are actually discouraged - WP:LEAD does state there is no blanket rule. The source does not say who the discoverer(s) in 1958 were. Not sure which sentences should be combined, honestly. I think I got the other issues.Jo-Jo Eumerus (talk, contributions) 09:16, 7 June 2016 (UTC)Reply
Not exactly discouraged, just that it is expected that lead stuff also occurs in the main article, and is cited there itself. So there is no need for citations in the lead, unless it is controversial and can be challenged. Combining sentences is not necessary, and I see the difficulty in such a factual article. Sainsf(talk·contribs) 09:23, 7 June 2016 (UTC)Reply