Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Deep to shallow crustal differentiation of within-plate alkaline magmatism at Mt. Bambouto volcano, Cameroon Line
Swedish Museum of Natural History. (NordSIMS)ORCID iD: 0000-0001-9018-6862
Show others and affiliations
2015 (English)In: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 220-223, p. 272-288Article in journal (Refereed) Published
Abstract [en]

At Mt. Bambouto, a continental stratovolcano of the Cameroon Line, magmatic activity lasted for over 20Ma and was characterized by at least two caldera formation events. Here we present detailed mineral and whole-rock compositions of Mt. Bambouto basanites, hawaiites, trachytes and phonolites, with emphasis on caldera related volcanic rocks. These data show that differentiation took place within a complex magma plumbing system, with magma chambers occurring at different depths within the crust. Though differentiation was chiefly dominated by fractional crystallization, chemical mineral zoning of olivines, clinopyroxenes, and feldspars is also indicative of open-system processes such as magma mixing and magma chamber recharge. Chemical zoning is evident mainly in the outer 100 microns of the analyzed crystals, suggesting that magma mixing occurred shortly before eruption. The last caldera collapse at about 15Ma also marked a clear change in the magma plumbing system. Before caldera collapse, Mt. Bambouto was characterized by a dominant production of peralkaline quartz trachytic magmas in shallow magma chambers. During this phase, evolved basic magmas (hawaiites) and strongly evolved alkaline magmas were formed in middle and upper crustal magma chambers, respectively. After emptying of the shallow quartz trachytic magma chamber and caldera collapse, magmas from the deep magmatic plumbing system were mobilized and partially mixed. This triggered eruptions of magmas on the caldera rims.

Place, publisher, year, edition, pages
2015. Vol. 220-223, p. 272-288
Keywords [en]
Cameroon Line, Petrogenesis, Magmatic plumbing system, Caldera
National Category
Natural Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3546OAI: oai:DiVA.org:nrm-3546DiVA, id: diva2:1375221
Available from: 2019-12-04 Created: 2019-12-04 Last updated: 2023-12-18Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

http://www.sciencedirect.com/science/article/pii/S0024493715000547

Search in DiVA

By author/editor
Merle, Renaud E.
By organisation
Swedish Museum of Natural History
In the same journal
Lithos
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 38 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf