Protracted late Neoproterozic–early Palaeozoic deformation and cooling history of Sør Rondane, East Antarctica, from 40Ar/39Ar and U–Pb geochronology

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A90120%2F20%3AN0000108" target="_blank" >RIV/26722445:90120/20:N0000108 - isvavai.cz</a>

Result on the web

<a href="https://www.cambridge.org/core/journals/geological-magazine/article/protracted-late-neoproterozic-early-palaeozoic-deformation-and-cooling-history-of-sor-rondane-east-antarctica-from-40ar39ar-and-upb-geochronology/1BE3FBE4958E39C04594D051B81A5070" target="_blank" >https://www.cambridge.org/core/journals/geological-magazine/article/protracted-late-neoproterozic-early-palaeozoic-deformation-and-cooling-history-of-sor-rondane-east-antarctica-from-40ar39ar-and-upb-geochronology/1BE3FBE4958E39C04594D051B81A5070</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/S0016756820000746" target="_blank" >10.1017/S0016756820000746</a>

Result language

angličtina

Original language name

Protracted late Neoproterozic–early Palaeozoic deformation and cooling history of Sør Rondane, East Antarctica, from 40Ar/39Ar and U–Pb geochronology

Original language description

40Ar/39Ar and U-Pb data from five structural domains constrain the late Neoproterozoic - early Palaeozoic tectonothermal history of the eastern part of the East African-Antarctic Orogen in Sor Rondane. A total of 27 new Ar/Ar ages span 570-474 Ma, roughly corresponding to the age range of three generations of syn- to post-tectonic granitoids. The ages are distinct for the five structural domains. The oldest cooling ages come from the weakly deformed southern part of the SW Terrane of Sor Rondane (SW Terrane S), a sliver of a Tonian island arc, which escaped much of the late Neoproterozoic accretionary deformation. This terrane was intruded by the oldest and largest granitoid complex at c. 640-620 Ma. The oldest Ar/Ar amphibole and biotite ages of 570-524 Ma are from the Main Shear Zone, along the northern margin of the SW Terrane S sliver. It hosts granites of age c. 584-570 Ma strung out along the shear zone. Two younger granitoid phases are recorded in the adjacent four terranes to the west, north and east of the SW Terrane S, and correlate with the younger group of Ar/Ar biotite ages spanning 513-474 Ma. We interpret the magmatic and cooling history of duration > 150 Ma to reflect repeated phases of accretion, magmatism and reactivation, that is, collage-style tectonism, partly pre-dating the incorporation of Sor Rondane into Gondwana. The study area first accreted to the cryptic Valkyrie Craton in Tonian times, was then 'sandwiched' between the Kalahari and Indo-Antarctica cratons, and experienced extensional tectonics and elevated heat flux due to lithospheric delamination, which resulted in slow cooling during the Pan-African Orogeny.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10505 - Geology

Project

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Continuities

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Publication year

2020

Confidentiality

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

Name of the periodical

Geological Magazine

ISSN

0016-7568

e-ISSN

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Volume of the periodical

158

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

21

Pages from-to

635-655

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85089745213