Supra-subduction thickening of a continental back-arc: Ediacaran-early Cambrian (Baikalian) metamorphism in the NE Baidrag block (Mongolian Collage)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169067" target="_blank" >RIV/00025798:_____/24:10169067 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/24:10496211
Result on the web
<a href="https://doi.org/10.1016/j.gr.2024.08.007" target="_blank" >https://doi.org/10.1016/j.gr.2024.08.007</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gr.2024.08.007" target="_blank" >10.1016/j.gr.2024.08.007</a>
Alternative languages
Result language
angličtina
Original language name
Supra-subduction thickening of a continental back-arc: Ediacaran-early Cambrian (Baikalian) metamorphism in the NE Baidrag block (Mongolian Collage)
Original language description
In-situ monazite geochronology with P-T modelling of Barrovian-type metasediments was carried in the Burd Gol zone, NE Baidrag block. The P-T peak recorded by Grt-Sil migmatite is similar to 780 degrees C, 7.5 kbar; by Grt-St-Ky gneiss similar to 690 degrees C, 10 kbar and by Grt schist similar to 590 degrees C, 8 kbar. Monazite ages related to metamorphic peaks indicate diachronous burial events, c. 570-565 Ma for the Grt-Sil migmatite, c. 565-560 Ma for the Grt-St-Ky gneiss, and at c. 538 Ma for the Grt schist. Tonian Grt-St schist recorded new monazite crystallization at c. 546-543 Ma. By c. 545-542 Ma, the Grt-Sil migmatite and Grt-St-Ky gneiss experienced exhumation to similar to 5 kbar, while the Grt schist underwent burial. Further exhumation is dated by xenotime, rutile and monazite alteration down to c. 515 Ma. The data suggest a prolonged orogenic cycle initiated by burial of distal orogenic core to the depths of similar to 35 km at c. 570-565 Ma while the proximal continental margin was buried at c. 545-538 Ma. The higher-grade core was subsequently exhumed to the middle crust at c. 550-540 Ma and the orogenic activity ceased at c. 515 Ma. The difference in metamorphic gradients around 570-560 Ma, with similar to 27-28 degrees C/km for the Grt-Sil migmatite and similar to 18-19 degrees C/km for the Grt-St-Ky gneiss suggests lateral variations as a result of localized juxtaposition of migmatite-magmatite lower-middle crust with colder regions. A new model shows the Burd Gol zone as a progressively thickened and exhumed continental back-arc system beneath the supracrustal 590-570 Ma continental back-arc represented by the adjacent Ulziit Gol unit. The data provide important constraint on the timing and mechanisms of orogenic Baikal cycle at the margin of the Siberian Craton.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GX19-27682X" target="_blank" >GX19-27682X: Principal mechanisms of peripheral continental growth during supercontinent cycle</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Gondwana research
ISSN
1342-937X
e-ISSN
1878-0571
Volume of the periodical
135
Issue of the periodical within the volume
Listopad 2024
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
32
Pages from-to
234-265
UT code for WoS article
001306100500001
EID of the result in the Scopus database
2-s2.0-85202662187