A 60 million year record of continental back-arc cyclic melting

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000081" target="_blank" >RIV/00025798:_____/19:00000081 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.nature.com/articles/s41561-019-0298-6" target="_blank" >https://www.nature.com/articles/s41561-019-0298-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41561-019-0298-6" target="_blank" >10.1038/s41561-019-0298-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A 60 million year record of continental back-arc cyclic melting

Popis výsledku v původním jazyce

Continental crust forms and evolves above subduction zones as a result of heat and mass transfer from the mantle below. The nature and extent of this transfer remain debated. While it has been recognized that arc magmatism at active continental margins can be cyclical at 50 to 1 Myr timescales, such cyclicity has not been recognized in the back-arc. Here we investigate the melting of sedimentary rocks in the continental back-arc of the western Gondwana margin during the Cambrian–Ordovician Famatinian mountain building process (orogeny) of NW Argentina. New LA-ICP-MS U-Pb age of zircons that formed during crustal melting, range from 505 to 440 Ma, concentrated into age groups spaced by 10-15 Myr. This suggests multiple and cyclical melting events in the continental back-arc, which matches the > 60 Myr duration of the magmatic activity in the arc and demonstrates that thermal and magmatic cyclicity extends also to the continental hinterland. We conclude that back-arc melting reflects a long-lasting, pulsating, cyclical heat transfer from mantle to crust that leads to thorough crustal reworking, transforming sedimentary rocks into crystalline continental crust. Thus, while magma transfer from the mantle promotes crustal growth in convergent margins, cyclical melting promotes crustal maturation of the back-arc.

Název v anglickém jazyce

A 60 million year record of continental back-arc cyclic melting

Popis výsledku anglicky

Continental crust forms and evolves above subduction zones as a result of heat and mass transfer from the mantle below. The nature and extent of this transfer remain debated. While it has been recognized that arc magmatism at active continental margins can be cyclical at 50 to 1 Myr timescales, such cyclicity has not been recognized in the back-arc. Here we investigate the melting of sedimentary rocks in the continental back-arc of the western Gondwana margin during the Cambrian–Ordovician Famatinian mountain building process (orogeny) of NW Argentina. New LA-ICP-MS U-Pb age of zircons that formed during crustal melting, range from 505 to 440 Ma, concentrated into age groups spaced by 10-15 Myr. This suggests multiple and cyclical melting events in the continental back-arc, which matches the > 60 Myr duration of the magmatic activity in the arc and demonstrates that thermal and magmatic cyclicity extends also to the continental hinterland. We conclude that back-arc melting reflects a long-lasting, pulsating, cyclical heat transfer from mantle to crust that leads to thorough crustal reworking, transforming sedimentary rocks into crystalline continental crust. Thus, while magma transfer from the mantle promotes crustal growth in convergent margins, cyclical melting promotes crustal maturation of the back-arc.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA13-16315S" target="_blank" >GA13-16315S: Prográdní metamorfóza, korové ztluštění a spodnokorový tok: nový koncept budování kořene variského orogenu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

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

12

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

215-219

Kód UT WoS článku

000460103000016

EID výsledku v databázi Scopus

2-s2.0-85061210122