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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

  • Czech description

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