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Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic
Will, T. M.1; Gaucher, C.2; Ling, X-X3; Li, X-H3; Li, Q-L3; Frimmel, H. E.1,4
2019
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume320Pages:303-322
AbstractThe Cuchilla Dionisio (or Punta del Este) Terrane of the southern Dom Feliciano Belt, eastern Uruguay, experienced a prolonged Neoproterozoic to Cambrian tectonothermal evolution. Zircon and monazite age data from orthogneisses of the basement of the terrane (Cerro Olivo Complex) provide evidence of widespread magmatism at c. 780 Ma and high-grade, up to granulite-facies metamorphism between 655 and 632 Ma. Isotope data imply that the orthogneiss protolithic melts formed in a within-plate, rift-related setting by Neoproterozoic (re-) melting of lower crustal material that was extracted from the mantle during the Palaeoproterozoic. We show that the terrane extends further north than previously thought. The presence of inherited Meso- and Palaeoproterozoic zircon grains indicates the existence of older crustal components in the terrane. The ages of the detrital zircon grains and their Hf isotope signatures cannot be explained by a Rio de la Plata Craton provenance but are consistent with a southern African Kalahari Craton origin. Ar-Ar ages of 628 and 625 Ma were obtained on magnesiohomblende in amphibolite from the northern Cuchilla Dionisio Terrane, whose protolith formed in an Ediacaran back-arc basin. These ages are interpreted as the time of amphibolite-facies metamorphism. Thus, crustal convergence between the Kalahari (or Congo?) and the Rio de la Plata Craton and subduction of the intervening oceanic basin must have been underway between 655 and 625 Ma. The early Neoproterozoic basement of the Cuchilla Dionisio Terrane is part of the southern African Namaqua Province that was separated from the Kalahari Craton during Rodinia break-up and opening of the southern Adamastor Ocean in the Tonian. Closure of this ocean in the late Cryogenian to early Ediacaran was associated with arc magmatism and high-temperature metamorphism of the Cuchilla Dionisio Terrane basement. A back arc basin formed and was closed between this arc and the western African margin. Relics of this basin were obducted onto the Cuchilla Dionisio Terrane at c. 625 Ma. Late Neoproterozoic intrusive igneous rocks from the Cuchilla Dionisio and the Coastal terranes were emplaced in a supra-subduction setting (at least in Uruguay) and have the same Hf isotope signature.
KeywordRodinia Gondwana Cuchilla Dionisio Terrane Cerro Olivo Complex U-Pb geochronology Ar-Ar geochronology Lu-Hf-O zircon isotope data
DOI10.1016/j.precamres.2018.11.004
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program
WOS KeywordDE-LA-PLATA ; DOM FELICIANO BELT ; NATURAL REFERENCE MATERIAL ; AFRICAN KAOKO BELT ; U-PB AGE ; WESTERN GONDWANA ; DAMARA OROGEN ; GEOCHRONOLOGICAL CONSTRAINTS ; MANTIQUEIRA PROVINCE ; GEODYNAMIC EVOLUTION
Language英语
Funding ProjectDeutsche Forschungsgemeinschaft[Wi 1225/8] ; Chinese State Key Research and Development Program[2016YFE0203000]
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000456899600018
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90508
Collection岩石圈演化国家重点实验室
Corresponding AuthorWill, T. M.
Affiliation1.Univ Wurzburg, Inst Geog & Geol, D-97074 Wurzburg, Germany
2.Univ Republica, Fac Ciencias, Inst Ciencias Geol, Igua 4225, Montevideo 11400, Uruguay
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Cape Town, Dept Geol Sci, ZA-7701 Rondebosch, South Africa
Recommended Citation
GB/T 7714
Will, T. M.,Gaucher, C.,Ling, X-X,et al. Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic[J]. PRECAMBRIAN RESEARCH,2019,320:303-322.
APA Will, T. M.,Gaucher, C.,Ling, X-X,Li, X-H,Li, Q-L,&Frimmel, H. E..(2019).Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic.PRECAMBRIAN RESEARCH,320,303-322.
MLA Will, T. M.,et al."Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic".PRECAMBRIAN RESEARCH 320(2019):303-322.
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