Syn-Eruptive Agglutination of Kimberlite Volcanic Ash

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dc.contributor.authorHaddock, David
dc.contributor.authorManya, Shukrani
dc.contributor.authorBrown, Richard James
dc.contributor.authorJones, Thomas
dc.contributor.authorWadsworth, Fabian
dc.contributor.authorDobson, Kate
dc.contributor.authorGernon, Thomas
dc.date.accessioned2021-04-12T22:33:55Z
dc.date.available2021-04-12T22:33:55Z
dc.date.issued2020-06-19
dc.description.abstractPyroclastic deposits of the Holocene Igwisi Hills kimberlite volcanoes, Tanzania, preserve unequivocal evidence for rapid, syn-eruptive agglutination. The unusual pyroclasts are composed of ash-sized particles agglutinated to each other by thin necks. The textures suggest the magma was disrupted into droplets during ascent. Collisions between particles occurred within a volcanic plume and on deposition within the conduit to form a weakly agglutinated, porous pyroclastic deposit. Theoretical considerations indicate that agglutination occurred over short timescales. Agglutinated clasts were entrained into weak volcanic plumes and deposited around the craters. Our results support the notion that agglutination can occur during kimberlite eruptions, and that some coherent, dense rocks in ancient kimberlite pipes interpreted as intrusive rocks could instead represent agglutinated pyroclastic rocks. Differentiating between agglutinated pyroclastic rocks and effusive or intrusive rocks in kimberlite pipes is important because of the potential effects that pyroclastic processes might have on diamond concentrations in deposits.en_US
dc.identifier.citationHaddock, D., Manya, S., Brown, R. J., Jones, T., Wadsworth, F., Dobson, K., & Gernon, T. (2020). Syn-eruptive agglutination of kimberlite volcanic ash. Volcanica, 3(1), 169-182.en_US
dc.identifier.doihttps://doi.org/10.30909/vol.03.01.169182
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5592
dc.language.isoenen_US
dc.publisherVolcanicaen_US
dc.subjectKimberliteen_US
dc.subjectWeldingen_US
dc.subjectAgglutinationen_US
dc.subjectVolcanic Ashen_US
dc.subjectPyroclastsen_US
dc.titleSyn-Eruptive Agglutination of Kimberlite Volcanic Ashen_US
dc.typeJournal Articleen_US
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