Talk:Bimodal volcanism

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Hotspots

According to this book bimodal volcanism also occurs at hotspots under continental crust. For example, the Yellowstone hotspot track. Volcanoguy 14:48, 3 December 2012 (UTC)[reply]

You're right - that reminds me that some of the neatest examples of this kind of volcanism come from Iceland, with simultaneously extruded basalts and rhyolites [1]. I'll add that when I get a moment, thanks. Mikenorton (talk) 15:58, 3 December 2012 (UTC)[reply]

Not to mention that it's a hotspot under (rather atypical) oceanic crust - the Canaries [2] and Galapagos (Alcedo) page 3 also erupt rhyolites it seems. Mikenorton (talk) 22:12, 3 December 2012 (UTC)[reply]

This came to my mind because while I was doing research on the Itcha Range shield volcano I found out it is made of felsic and mafic lavas, which means it is a product of bimodal volcanism. The nearby Ilgachuz Range shield is also bimodal. I have seen several theories about the origin of the Anahim Volcanic Belt (which includes the Itcha and Ilgachuz ranges), but the one that seems to be mostly accepted is a hotspot track. Volcanoguy 23:22, 3 December 2012 (UTC)[reply]

Requested move 11 August 2016

The following is a closed discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review. No further edits should be made to this section.

The result of the move request was: No consensus to move for now. The reply was not responded to or opposed itself. Perhaps a redirect from the new proposed title to the old in the meantime wouldn't be controversial (non-admin closure) — Andy W. (talk · ctb) 17:34, 19 August 2016 (UTC)[reply]

Bimodal volcanism → Bimodal magmatism – Bimodal igneous activity is not restricted to volcanism but also to plutons. Changin the name to Bimodal magmatism catch this bimodal acticity too. Mamayuco (talk) 21:31, 11 August 2016 (UTC)[reply]

Your idea has some good aspects and, by the strictest geological terminology, it is correct. But, unfortunately, the meaning of "volcanism" has been widened over the years (by probably too many geologists) to include not only surface volcanism and near-surface volcanism but also plutons (i.e. magmatism). Therefore, bimodal volcanism can include bimodal magmatism, because volcanism is often used as a synonym for magmatism. Volcanism is a more widely-known and more widely-used term than magmatism. I know this is problematic and a bit of a chicken-and-egg situation with pros and cons on both sides, and I suggest that we don't make any hasty changes yet. GeoWriter (talk) 17:16, 12 August 2016 (UTC)[reply]

The above discussion is preserved as an archive of a requested move. Please do not modify it. Subsequent comments should be made in a new section on this talk page or in a move review. No further edits should be made to this section.

Image

Surely a better image could be used in this article. Subduction zones are rarely characterized by bimodal volcanism as volcanic arcs normally have a lot of rocks of intermediate composition. Volcanoguy 00:33, 17 May 2023 (UTC)[reply]

There's a lot wrong with that image - the subducting slab does not melt for instance. I've looked around for an alternative image that I could use as the basis for a diagram, without much luck. Perhaps I should just produce something very diagrammatic showing the two main mechanisms - partial melting of the crust by a large magma body or differentiation of such a body. I could use elements of this Nature paper and this one in Lithos. I'll see what I can come up with. Mikenorton (talk) 16:38, 6 May 2024 (UTC)[reply]