Lithium isotopes in kimberlites, lamproites and lamprophyres as tracers of source components and processes related to supercontinent cycles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000018" target="_blank" >RIV/00025798:_____/22:00000018 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985831:_____/22:00552866 RIV/00216305:26110/22:PU143617

Výsledek na webu

<a href="https://sp.lyellcollection.org/content/513" target="_blank" >https://sp.lyellcollection.org/content/513</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/SP513-2021-60" target="_blank" >10.1144/SP513-2021-60</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lithium isotopes in kimberlites, lamproites and lamprophyres as tracers of source components and processes related to supercontinent cycles

Popis výsledku v původním jazyce

Our pilot study reveals potential fingerprints of Li isotopes recorded in the Mesoproterozoic (c. 1.4–1.1 Ga) kimberlites, lamproites and lamprophyres from the Eastern Dharwar Craton and Paleocene (62 Ma) orangeite from the Bastar Craton in India. The new data are interpreted in the context of available Li isotope composition of lamproitic to lamprophyric rocks occurring in Variscan (Bohemian Massif) and Alpine–Himalayan (SW Tibet) orogenic belts formed in response to Gondwana–Pangea amalgamation and break-up. As a result of supercontinents’ development, kimberlites from the Eastern Dharwar Craton and ‘orangeite’ from the Bastar Craton show clear presence of a component with a heavy Li isotope signature (delta7Li up to 9.7per mille) similar to an ancient altered oceanic crust, whereas the Eastern Dharwar Craton lamproites (2.3–6.3per mille) and lamprophyres (3.3–6.7per mille) show Li isotope signatures indicative of a dominant contribution from heterogeneous lithospheric mantle. Variscan lamprophyric to lamproitic rocks and post-collisional mantle-derived (ultra)potassic volcanic rocks from SW Tibet, i.e. rocks from the orogenic belts outside the cratonic areas, are characterized by a clear Li isotope shift towards an isotopically lighter component (delta7Li as low as –9.5per mille) comparable with the involvement of an evolved continental crust and high-pressure metamorphic rocks in their orogenic mantle source. Such components with isotopically light Li are strikingly missing in the source of cratonic kimberlites, lamproites and lamprophyres.

Název v anglickém jazyce

Lithium isotopes in kimberlites, lamproites and lamprophyres as tracers of source components and processes related to supercontinent cycles

Popis výsledku anglicky

Our pilot study reveals potential fingerprints of Li isotopes recorded in the Mesoproterozoic (c. 1.4–1.1 Ga) kimberlites, lamproites and lamprophyres from the Eastern Dharwar Craton and Paleocene (62 Ma) orangeite from the Bastar Craton in India. The new data are interpreted in the context of available Li isotope composition of lamproitic to lamprophyric rocks occurring in Variscan (Bohemian Massif) and Alpine–Himalayan (SW Tibet) orogenic belts formed in response to Gondwana–Pangea amalgamation and break-up. As a result of supercontinents’ development, kimberlites from the Eastern Dharwar Craton and ‘orangeite’ from the Bastar Craton show clear presence of a component with a heavy Li isotope signature (delta7Li up to 9.7per mille) similar to an ancient altered oceanic crust, whereas the Eastern Dharwar Craton lamproites (2.3–6.3per mille) and lamprophyres (3.3–6.7per mille) show Li isotope signatures indicative of a dominant contribution from heterogeneous lithospheric mantle. Variscan lamprophyric to lamproitic rocks and post-collisional mantle-derived (ultra)potassic volcanic rocks from SW Tibet, i.e. rocks from the orogenic belts outside the cratonic areas, are characterized by a clear Li isotope shift towards an isotopically lighter component (delta7Li as low as –9.5per mille) comparable with the involvement of an evolved continental crust and high-pressure metamorphic rocks in their orogenic mantle source. Such components with isotopically light Li are strikingly missing in the source of cratonic kimberlites, lamproites and lamprophyres.

Druh

C - Kapitola v odborné knize

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GX19-29124X" target="_blank" >GX19-29124X: VÝVOJ STAVEB A GEOCHEMICKÉ SIGNATURY KARBONATITŮ V ČASE: VÝZNAM MOBILITY A KONCENTRACE KRITICKÝCH KOVŮ</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název knihy nebo sborníku

Lamprophyres, Lamproites and Related Rocks: Tracers to Supercontinent Cycles and Metallogenesis

ISBN

978-1-78620-543-8

Počet stran výsledku

28

Strana od-do

209-236

Počet stran knihy

474

Název nakladatele

The Geological Society Publishing House

Místo vydání

Bath

Kód UT WoS kapitoly

—