Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction-related origin of some A-type granites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F10%3A00000042" target="_blank" >RIV/00025798:_____/10:00000042 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction-related origin of some A-type granites

Popis výsledku v původním jazyce

Lithium data are presented for plutonic rocks from the Western Carpathians, Slovakia, that were generated throughout the complete Variscan orogenic cycle. I-type granites show a limited range of ?7Li, contrasting with the large variations found in S-typegranites and orthogneisses of distinct ages. An exclusively heavy Li isotope signature (?7Li > 4.7?) found in A-type granites rules out several commonly accepted petrogenetic scenarios. It most probably reflects a derivation of A-type granites from a mantle wedge modified by slab-derived fluids. Mafic rocks (gabbros and diorites), associated with occurrences of granites, are uniformly Li-rich and isotopically light (< - 0.5?), precluding a direct derivation from the mantle. These signatures testify totheir cumulate origin. The presumed dichotomy between the sources and processes leading to generation of S- and I-type granitic magmas does not seem to be reflected by Li isotope signatures in a simple and globally valid manner.

Název v anglickém jazyce

Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction-related origin of some A-type granites

Popis výsledku anglicky

Lithium data are presented for plutonic rocks from the Western Carpathians, Slovakia, that were generated throughout the complete Variscan orogenic cycle. I-type granites show a limited range of ?7Li, contrasting with the large variations found in S-typegranites and orthogneisses of distinct ages. An exclusively heavy Li isotope signature (?7Li > 4.7?) found in A-type granites rules out several commonly accepted petrogenetic scenarios. It most probably reflects a derivation of A-type granites from a mantle wedge modified by slab-derived fluids. Mafic rocks (gabbros and diorites), associated with occurrences of granites, are uniformly Li-rich and isotopically light (< - 0.5?), precluding a direct derivation from the mantle. These signatures testify totheir cumulate origin. The presumed dichotomy between the sources and processes leading to generation of S- and I-type granitic magmas does not seem to be reflected by Li isotope signatures in a simple and globally valid manner.

Druh

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

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA205%2F07%2F0992" target="_blank" >GA205/07/0992: Aplikace netradičních izotopů na řešení petrogeneze granitoidních hornin</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název periodika

Chemical Geology

ISSN

0009-2541

e-ISSN

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Svazek periodika

274

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

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Kód UT WoS článku

000279094700009

EID výsledku v databázi Scopus

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