Garnet growth and mineral geochronology constrains the diachronous Neoproterozoic convergent evolution of the southern Dom Feliciano Belt, Uruguay
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F23%3A00574667" target="_blank" >RIV/67985831:_____/23:00574667 - isvavai.cz</a>
Alternative codes found
RIV/00025798:_____/23:10168849
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/10.1111/jmg.12734" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1111/jmg.12734</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jmg.12734" target="_blank" >10.1111/jmg.12734</a>
Alternative languages
Result language
angličtina
Original language name
Garnet growth and mineral geochronology constrains the diachronous Neoproterozoic convergent evolution of the southern Dom Feliciano Belt, Uruguay
Original language description
The Dom Feliciano Belt of southern Brazil and Uruguay represents part of a larger Neoproterozoic orogenic system formed during the amalgamation of Western Gondwana. The hinterland and foreland domains in parts of the belt preserve deformation structures and metamorphic assemblages that developed during early crustal thickening from c. 650 Ma. However, the metamorphic history of the southern foreland, in Uruguay, and its relationship with the hinterland, is not so well understood. We show that metamorphism in the southern hinterland is characterized by near-isothermal decompression from ~10 kbar (~770°C) down to ~6 kbar, reflecting exhumation from depths of ~40 km during convergent thrusting and crustal thickening. This metamorphic event and associated magmatism is constrained by garnet Lu–Hf and zircon U–Pb dating to c. 655–640 Ma, supporting age and P–T constraints from previous studies. In contrast, prograde metamorphism in the foreland supracrustal rocks reached maximum lower-amphibolite facies conditions (~6–7 kbar and~550 –570 °C) and is constrained by garnet Lu–Hf dating to 5 82 ± 23 Ma. An exposed sheet of imbricated foreland basement rocks reached partial melting at upper-amphibolite facies conditions, and metamorphism issimilarly constrained to c. 585–570 Ma by monazite U–Pb dating. The dataindicate that metamorphism in the foreland occurred during a sinistral transpressional event c. 55–85 Ma after the start of crustal thickening recorded in the hinterland, whereby strain partitioning during sinistral transpression led to imbrication in the foreland and oblique thrusting of the basement over more distal supracrustal rocks. This event is coeval with transpressional deformation in the Kaoko and Gariep belts, indicating a distinct two-stage tectonic history driven by the three-way convergence between the Congo, Kalahari,and South American cratons.
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
—
OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA18-24281S" target="_blank" >GA18-24281S: Did the West-Gondwana orogens form by inversion of long-lived rift domains?</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Metamorphic Geology
ISSN
0263-4929
e-ISSN
1525-1314
Volume of the periodical
41
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
34
Pages from-to
997-1030
UT code for WoS article
001000053600001
EID of the result in the Scopus database
2-s2.0-85161394191