Talk:Diamond Peak (Oregon)

Huh

The article states that though its lava flows show residual magnetism, the volcano does not display evidence of eruptive activity within the past 10,000 years, suggesting that it is now extinct. How does not having an eruption in the last 10,000 years make Diamond Peak extinct? Likewise Broken Top. Volcanoes can be quiet for hundreds, thousands, tens of thousands and even hundreds of thousands of years between eruptions! Volcanoguy 19:10, 27 December 2017 (UTC)

@Volcanoguy: That's a non-sequitur on my part. I need to double check the sources though before I make any changes. I came to both articles already stating the volcanoes were extinct, and I may have made the mistake of trusting those accounts as a result. ceranthor 20:29, 27 December 2017 (UTC)

The Williams (1944) source states this: "Although the Todd Lake volcano stands at lower elevation than the andesite dacite cone of the South Sister, it preserves much less of its original form, and hence is presumed to be older. Interfingering of lavas from Broken Top with the andesites of the Todd Lake cone indicates that for a time the two volcanoes erupted simultaneously. However, when this occurred, Broken Top was approaching extinction."

For Diamond Peak, its extinct status is explained here, in this 1983 report, on page 4: "As there is no indication of post-glacial (less than 10,000 years) activity, the volcano is probably extinct." I can adjust the sentence to no signs of any volcanic activity. ceranthor 20:36, 27 December 2017 (UTC)

Okay I didn't know that. But notice the USGS states that the volcano is probably extinct so they're not being honest about it. The main reason I do not use the words dormant or extinct in volcano articles is because there is no easy way of telling the difference between them. Some volcanoes previously thought to be extinct have had renewed eruptions. Volcanoguy 21:02, 27 December 2017 (UTC)

Definitely. I tried to avoid it in Three Sisters (Oregon), which I just brought to FA. ceranthor 21:17, 27 December 2017 (UTC)

@Volcanoguy: Removed definitive statement of extinction in both articles. I agree that both could still potentially erupt. ceranthor 21:27, 27 December 2017 (UTC)

Basaltic andesite or andesite

The DYK hook says the volcano is andesitic. The article says the mountain is basaltic andesite about a dozen times. The Wikipedia article on basaltic andesite clearly says it is not the same rock.

Which rock is it?

--2600:1700:FB00:9C00:1570:E327:8FA4:3283 (talk) 19:17, 17 January 2018 (UTC)

@2600:1700:FB00:9C00:1570:E327:8FA4:3283: I'm more than happy to clarify. Diamond Peak is mostly basaltic andesite, as the article points out several times, but per Hildreth (2007; linked here) "Stratocones that likewise contain substantial basaltic andesite but also extend to andesitic or more silicic products include Broken Top, Middle Sister, Diamond Peak, and Mount Bailey". I've fixed the article and removed the tag. Thanks for pointing out the confusion. ceranthor 19:41, 17 January 2018 (UTC)

Have you fixed your unsourced bunk hook on the main page? --2600:1700:FB00:9C00:1570:E327:8FA4:3283 (talk) 21:12, 17 January 2018 (UTC)

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