Talk:Tephra

Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 21 January 2020 and 10 May 2020. Further details are available on the course page. Student editor(s): Mikabella95.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 10:51, 17 January 2022 (UTC)

Misc.

merge with pryroclastic rock

also the redirect from TEFRA should be changed since this is an acronym for Tax Equity and Fiscal Responsibility Act of 1982

—Preceding unsigned comment added by Evanreiser (talk • contribs) 22:06, 12 January 2007

Created TEFRA as redirect for you, if you're gonna use an acronym then cap it. Removed irrelevant see also link, why would anyone type in tephra looking for that? Vsmith 23:23, 12 January 2007 (UTC)

non-silica rich tephra

Since when is tephra only a product of high silica magmas? I'm sure explosive eruptions can occur when basaltic magma makes contact with water during a submarine eruption. Black Tusk (talk) 04:40, 6 November 2008 (UTC)

Etymology section #3?

Usually we tend to put etymology within the overview or directly after it. I don't think I've ever seen it so far down. Warmest Regards, :)—_thecurran Speak your mind ^{my past} 15:16, 7 December 2015 (UTC)

Following the eruption 19 March at 20:45 at a location called Geldingadalur, in a valley 4.7km inland from the southern coast of the Reykjanes peninsula Iceland. I wanted to ask the same question. What is the etymology of 'TEPHRA'? — Preceding unsigned comment added by Myrddin55 (talk • contribs) 10:27, 20 March 2021 (UTC)

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Added a Citation

Dear colleagues,

A citation was added the the overview section. Mikabella95 (talk) 02:19, 26 February 2020 (UTC)

Additional Bibliography References

Hi everyone.

Here are some additional references that could be used in the article.

Bibliography

Riley, C.M. Tephra, Michigan Technological University, 1993, www.geo.mtu.edu/volcanoes/hazards/primer/tephra.html.

“Volcano Hazards Program.” Volcano Hazards Program, USGS, 2 Feb. 2016, volcanoes.usgs.gov/vhp/tephra.html.

Ponomareva, Vera, et al. “Tephra without Borders: Far-Reaching Clues into Past Explosive Eruptions.” Frontiers in Earth Science, vol. 3, 22 Dec. 2015, doi:10.3389/feart.2015.00083.

Allen, Judy R. M., and Brian Huntley. “Effects of Tephra Falls on Vegetation: A Late-Quaternary Record from Southern Italy.” Journal of Ecology, vol. 106, no. 6, 2018, pp. 2456–2472., doi:10.1111/1365-2745.12998.

Arnalds, Olafur. “The Influence of Volcanic Tephra (Ash) on Ecosystems.” Advances in Agronomy, Dec. 2013, pp. 331–380., doi:10.1016/b978-0-12-407685-3.00006-2.

Longman, Jack, et al. “The Role of Tephra in Enhancing Organic Carbon Preservation in Marine Sediments.” Earth-Science Reviews, vol. 192, May 2019, pp. 480–490., doi:10.1016/j.earscirev.2019.03.018. Mikabella95 (talk) 19:09, 10 March 2020 (UTC)

Added New Sections

Hi everyone,

I expanded the lead. I added 3 sections titled: 1)Environmental Impacts, 2)Disciplines and the Fossil Record, and 3) Volcanoes (it describes a couple of famous volcanoes from each continent). Feel free to expand the sections. Mikabella95 (talk) 23:35, 6 May 2020 (UTC)

Central America (part of North America) not mentioned

Central American volcanoes are not mention, although they have played an important part in world history. The 540 Ilopango eruption contributed to the declines of the eastern Roman Empire and the Sassanid Empire and to the Arab conquests of the 7th century. Banderswipe (talk) 15:38, 1 February 2023 (UTC)

What materials are NOT tephra?

I wish this article would explicitly say any materials that are not tephra, to better illustrate the definition and remind me of everything that occurs during a volcano.

First question: Are volcanic gases considered tephra, or not? I'm guessing no, because the list of types of tephra doesn't include gases. But it may be an incomplete list.

Second question: Is lava considered tephra, and under what circumstances? Pyroclastic bombs are listed as tephra, and I believe they are often lava. However, lava that flows out over the surface, without flying or fragmenting, may not be considered tephra, because it seems fragmentation is part of the definition. I could be mistaken.

I notice that overlying rock that gets blown apart does qualify as tephra, which is interesting because it may not qualify as ejecta, I'm not sure. 209.6.225.254 (talk) 13:10, 20 July 2024 (UTC)

It seems fairly clear to me but then I'm a geologist, so some clarification is probably in order. Neither lava nor gasses are tephra. It needs to be clearer in my view, that lithified tephra are tuffs of various types. Unfortunately, tephrochronology is generally about tuff layers rather than tephra. Mikenorton (talk) 14:52, 20 July 2024 (UTC)

This source has some good definitions. Mikenorton (talk) 15:28, 20 July 2024 (UTC)

This is a useful review from 2022. Mikenorton (talk) 16:00, 20 July 2024 (UTC)

I think we should be just brave in article and use Lowe et. als. definition as its better than 2008 definition used and have so acted. The unconsolidated issue is secondary, covered later in paragraph and perhaps better to say initially unconsolidated given what can happen to buried tephra deposits subjected to pressure and chemical change with time. My reply to first good question and I am not a geologist but had some ancient now understanding of physical/materials chemistry is that while volcanic gases are not regarded as tephra, theoretically if a volcanic gas contained a solid (or liquid) sublimed because of eruption temperature that then precipitated at normal environmental temperatures and stayed from then on non gaseous this would be tephra. As to if snow or carbon dioxide snow could be regarded as tephra if definition extended off Earth for volcanic deposits on other planets as it is likely to have been, as its a useful concept, that is another matter. ChaseKiwi (talk) 23:02, 20 July 2024 (UTC)