Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F12%3A00000022" target="_blank" >RIV/00025798:_____/12:00000022 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.nature.com/ngeo/archive/index.html" target="_blank" >http://www.nature.com/ngeo/archive/index.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/ngeo1482" target="_blank" >10.1038/ngeo1482</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs

Popis výsledku v původním jazyce

At subduction zones, oceanic lithosphere that has interacted with sea water is returned to the mantle, heats up during descent and releases fluids by devolatilization of hydrous minerals. Models for the formation of magmas feeding volcanoes above subduction zones require largescale transport of these fluids into overlying mantle wedges. Fluid flow also seems to be linked to seismicity in subducting slabs. However, the spatial and temporal scales of this fluid flow remain largely unknown, with suggestedtimescales ranging from tens to tens of thousands of years. Here we use the Li?Ca?Sr isotope systems to consider fluid sources and quantitatively constrain the duration of subduction-zone fluid release at ~70 km depth within subducting oceanic lithosphere, now exhumed in the Chinese Tianshan Mountains. Using lithiumdiffusion modelling, we find that the wall-rock porosity adjacent to the flowpath of the fluids increased ten times above the background level. We show that fluids released by

Název v anglickém jazyce

Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs

Popis výsledku anglicky

At subduction zones, oceanic lithosphere that has interacted with sea water is returned to the mantle, heats up during descent and releases fluids by devolatilization of hydrous minerals. Models for the formation of magmas feeding volcanoes above subduction zones require largescale transport of these fluids into overlying mantle wedges. Fluid flow also seems to be linked to seismicity in subducting slabs. However, the spatial and temporal scales of this fluid flow remain largely unknown, with suggestedtimescales ranging from tens to tens of thousands of years. Here we use the Li?Ca?Sr isotope systems to consider fluid sources and quantitatively constrain the duration of subduction-zone fluid release at ~70 km depth within subducting oceanic lithosphere, now exhumed in the Chinese Tianshan Mountains. Using lithiumdiffusion modelling, we find that the wall-rock porosity adjacent to the flowpath of the fluids increased ten times above the background level. We show that fluids released by

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Geoscience

ISSN

1752-0894

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

4

Strana od-do

489-492

Kód UT WoS článku

000307098400019

EID výsledku v databázi Scopus

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