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Ediacaran bimodal volcanism in the southernmost Dom Feliciano Belt, Uruguay: Implications for the evolution of SW Gondwana
Will, T. M.1; Gaucher, C.2,3; Ling, X. -X.4; le Roux, P. J.5; Li, X. -h.4; Li, Q. -l.4
2021-12-15
Source PublicationLITHOS
ISSN0024-4937
Volume406-407Pages:24
AbstractNew zircon U-Pb-Hf-O, whole rock geochemical and Sr-Nd-Pb isotope data of Ediacaran volcanic rocks from the Cuchilla Dionisio (CDT) and Nico Pe ' rez (NPT) terranes in Uruguay are presented. High-K calc-alkaline rhyolite from the Cerros de Aguirre Formation in the southern CDT formed at an active continental margin at 569 +/- 5 Ma. A metasomatized mantle source is invoked for the formation of the rhyolitic melts. Cogenetic andesite and basaltic andesite have Sr-Nd isotope compositions that are close to that of enriched mantle 1, which is consistent with melt formation in the subcontinental mantle in the presence of crustal material. Coeval rhyolite in the northern CDT is inferred to have formed distally to the active margin. Rhyolite and trachyte of the Sierra de ' Animas Formation in the NPT formed at 589 +/- 3 Ma and 586 +/- 3 Ma, respectively. The NPT basalts originated in the mantle and may be related to a mantle plume. During ascent they were variably contaminated by continental crust. Zircon in NPT rhyolite have very low 818O values that are ascribed to hydrothermal alteration and melting at shallow crustal levels. We propose that the late Ediacaran igneous activity in the NPT was related to anorogenic, extensional processes in an intraplate setting but the c. 20 million years younger volcanic activity in the southern CDT occurred in a supra-subduction setting above the subducting Brazilides ocean. We ascribe the bimodal intraplate volcanism in the NPT to far-field forces caused by slab-pull in response to eastward-directed subduction of the Brazilides ocean underneath Arachania, which is a rifted-off segment of the Kalahari Craton. Thus, late Ediacaran subduction-induced lithospheric stretching and horizontal extension of the eastern margin of the Rio de la Plata Craton is proposed as the main cause for bimodal volcanism and the deposition of coeval volcano-sedimentary successions at the end of the Neoproterozoic.
KeywordUruguay Late Ediacaran bimodal volcanism Crustal stretching Low 8(18)O silicic magmas
DOI10.1016/j.lithos.2021.106539
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordLA-PLATA CRATON ; CUCHILLA DIONISIO TERRANE ; NICO PEREZ TERRANE ; ISOTOPE GEOCHEMISTRY ; CALC-ALKALINE ; ZIRCON ; COMPLEX ; ND ; GEOCHRONOLOGY ; MAGMATISM
Language英语
Funding ProjectDeutsche Forschungsgemeinschaft[Wi 1225/8-3] ; National Natural Science Foundation of China[41773047]
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000722656600006
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/103890
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.Univ Republ, CURE, Polo Desarrollo Univ Geol & Recursos Miner, Treinta Tres, Uruguay
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.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. Ediacaran bimodal volcanism in the southernmost Dom Feliciano Belt, Uruguay: Implications for the evolution of SW Gondwana[J]. LITHOS,2021,406-407:24.
APA Will, T. M.,Gaucher, C.,Ling, X. -X.,le Roux, P. J.,Li, X. -h.,&Li, Q. -l..(2021).Ediacaran bimodal volcanism in the southernmost Dom Feliciano Belt, Uruguay: Implications for the evolution of SW Gondwana.LITHOS,406-407,24.
MLA Will, T. M.,et al."Ediacaran bimodal volcanism in the southernmost Dom Feliciano Belt, Uruguay: Implications for the evolution of SW Gondwana".LITHOS 406-407(2021):24.
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