Magma mixing in the 1100 AD Montaña Reventada composite lava flow, Tenerife, Canary Islands: Interaction between rift zone and central volcano plumbing systems

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Wiesmaier, SebastianDepartment of Geology, Trinity College Dublin, 2 College Green, Dublin 2, Ireland (författare)

Magma mixing in the 1100 AD Montaña Reventada composite lava flow, Tenerife, Canary Islands : Interaction between rift zone and central volcano plumbing systems

Artikel/kapitelEngelska2011

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2011-02-03
Springer,2011
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:uu-132696
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132696URI
https://doi.org/10.1007/s00410-010-0596-xDOI

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Språk:engelska
Sammanfattning på:engelska

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Erratum in: Contributions to Mineralogy and Petrology, 2011, vol. 162, pp 671-673, doi: 10.1007/s00410-011-0668-6
Zoned eruption deposits commonly show a lower felsic and an upper mafic member, thought to reflect eruption from large, stratified magma chambers. In contrast, the Montaña Reventada composite flow (Tenerife) consists of a lower basanite and a much thicker upper phonolite. A sharp interface separates basanite and phonolite, and chilled margins at this contact indicate the basanite was still hot upon emplacement of the phonolite, i.e. the two magmas erupted in quick succession. Four types of mafic to intermediate inclusions are found in the phonolite. Inclusion textures comprise foamy quenched ones, others with chilled margins and yet others that are physically mingled, reflecting progressive mixing with a decreasing temperature contrast between the end-members. Analysis of basanite, phonolite and inclusions for majors, traces and Sr, Nd and Pb isotopes show the inclusions to be derived from binary mixing of basanite and phonolite end-members in ratios of 2:1 to 4:1. Although, basanite and phonolite magmas were in direct contact, contrasting 206Pb/204Pb ratios show that they are genetically distinct (19.7193(21)–19.7418(31) vs. 19.7671(18)–19.7807(23), respectively). We argue that the Montaña Reventada basanite and phonolite first met just prior to eruption and had limited interaction time only. Montaña Reventada erupted from the transition zone between two plumbing systems, the phonolitic Teide-Pico Viejo complex and the basanitic Northwest rift zone. A rift zone basanite dyke most likely intersected the previously emplaced phonolite magma chamber. This led to eruption of geochemically and texturally unaffected basanite, with the inclusion-rich phonolite subsequently following into the established conduit.

Ämnesord och genrebeteckningar

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
Magma mixing
basanite
phonolite
Tenerife
Canary Islands
Reventada
Earth sciences
Geovetenskap
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Geovetenskap med inriktning mot mineralogi, petrologi och tektonik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Deegan, Frances M,1983-Uppsala universitet,Berggrundsgeologi(Swepub:uu)frade877 (författare)
Troll, Valentin RUppsala universitet,Berggrundsgeologi(Swepub:uu)valtr808 (författare)
Carracedo, Juan CarlosEstación Volcanológica de Canarias, IPNA-CSIC, Av. Astrofísica Francisco Sanchez 3, 38206 La Laguna, Tenerife, Spain (författare)
Chadwick, Jane PDepartment of Petrology (FALW), Vrjie Universiteit, 1081 HV Amsterdam, The Netherlands (författare)
Chew, David MDepartment of Geology, Trinity College Dublin, 2 College Green, Dublin 2, Ireland (författare)
Department of Geology, Trinity College Dublin, 2 College Green, Dublin 2, IrelandBerggrundsgeologi (creator_code:org_t)

Sammanhörande titlar

Ingår i:Contributions to Mineralogy and Petrology: Springer162:3, s. 651-6690010-79991432-0967

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Av författaren/redakt...: Wiesmaier, Sebas ...; Deegan, Frances ...; Troll, Valentin ...; Carracedo, Juan ...; Chadwick, Jane P; Chew, David M

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