Rapid hydrothermal cooling above the axial melt lens at fast-spreading mid-ocean ridge

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dc.identifier.uri http://dx.doi.org/10.15488/445
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/468
dc.contributor.author Zhang, Chao
dc.contributor.author Koepke, Jürgen
dc.contributor.author Kirchner, Clemens
dc.contributor.author Götze, Niko
dc.contributor.author Behrens, Harald
dc.date.accessioned 2016-08-29T08:04:57Z
dc.date.available 2016-08-29T08:04:57Z
dc.date.issued 2014-09-11
dc.identifier.citation Zhang, Chao; Koepke, Jürgen; Kirchner, Clemens; Götze, Niko; Behrens, Harald: Rapid hydrothermal cooling above the axial melt lens at fast-spreading mid-ocean ridge. In: Scientific Reports 4 (2015), 6342. DOI: http://dx.doi.org/10.1038/srep06342
dc.description.abstract Axial melt lenses sandwiched between the lower oceanic crust and the sheeted dike sequences at fast-spreading mid-ocean ridges are assumed to be the major magma source of oceanic crust accretion. According to the widely discussed "gabbro glacier'' model, the formation of the lower oceanic crust requires efficient cooling of the axial melt lens, leading to partial crystallization and crystal-melt mush subsiding down to lower crust. These processes are believed to be controlled by periodical magma replenishment and hydrothermal circulation above the melt lens. Here we quantify the cooling rate above melt lens using chemical zoning of plagioclase from hornfelsic recrystallized sheeted dikes drilled from the East Pacific at the Integrated Ocean Drilling Program Hole 1256D. Weestimate the cooling rate using a forward modelling approach based on CaAl-NaSi interdiffusion in plagioclase. The results show that cooling from the peak thermal overprint at 1000-10506 degrees C to 6006 degrees C are yielded within about 10-30 years as a result of hydrothermal circulation above melt lens during magma starvation. The estimated rapid hydrothermal cooling explains how the effective heat extraction from melt lens is achieved at fast-spreading mid-ocean ridges. eng
dc.description.sponsorship DFG/KO1723/12-1
dc.description.sponsorship DFG/KO1723/12-2
dc.language.iso eng
dc.publisher London : Nature Publishing Group
dc.relation.ispartofseries Scientific Reports 4 (2015)
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject east pacific rise eng
dc.subject lower oceanic-crust eng
dc.subject magma chamber eng
dc.subject oman ophiolite eng
dc.subject evolution eng
dc.subject model eng
dc.subject roof eng
dc.subject plagioclase eng
dc.subject constraints eng
dc.subject diffusion eng
dc.subject.ddc 500 | Naturwissenschaften ger
dc.title Rapid hydrothermal cooling above the axial melt lens at fast-spreading mid-ocean ridge eng
dc.type Article
dc.type Text
dc.relation.issn 2045-2322
dc.relation.doi http://dx.doi.org/10.1038/srep06342
dc.bibliographicCitation.volume 4
dc.bibliographicCitation.firstPage 6342
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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