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Provenance of metasedimentary rocks of the western Dom Feliciano Belt in Uruguay: Insights from U–Pb detrital zircon geochronology, Hf and Nd model ages, and geochemical data
Journal of South American Earth Sciences ( IF 1.7 ) Pub Date : 2021-01-08 , DOI: 10.1016/j.jsames.2020.103139
P. Oyhantçabal , S. Oriolo , K. Wemmer , M.A.S. Basei , D. Frei , S. Siegesmund

New isotopic and geochemical data for the Paleo- Meso- and Neoproterozoic metasedimentary cover of the southern Dom Feliciano Belt (Brasiliano/Pan-African) are presented and evaluated combined with published information. Whole-rock major and trace element geochemistry indicates that the dominant source for all the units had a composition similar to average upper continental crust. The geochemistry is similar even for late Ediacaran successions with a source component from slightly older Ediacaran granites, due to the crustal origin of these granites. Age constraints based on detrital zircon, fossil content, interbedded volcanic rocks and isotope geochemistry confirm Paleo-, Meso-, and Neoproterozoic successions, despite uncertainties remain in some cases. Detrital zircon data show the dominance of Archean (3.3–2.8 Ga) to Paleoproterozoic (2.2–1.9 Ga), and subordinated Mesoproterozoic (1.5–1.3 and 1.1 Ga) and Neoproterozoic (0.5–0.6 Ga) ages. Lu–Hf zircon and Sm–Nd whole-rock model ages confirm that the Archean and the Paleoproterozoic were the major crustal growth periods for the source areas. U–Pb detrital zircon age distributions and model ages demonstrate that the Nico Pérez Terrane and not the Río de la Plata Craton was the source for most metasedimentary rocks of the western Dom Feliciano Belt. Likewise, comparison of Archean, Paleo-, Meso- and Neoproterozoic events supports that the Nico Pérez Terrane could represent a fragment of the Congo Craton.



中文翻译:

乌拉圭Dom Feliciano带西部准沉积岩的物源:U–Pb碎屑锆石年代学,Hf和Nd模型年龄以及地球化学数据的见解

介绍和评估了南部Dom Feliciano带(巴西/泛非)的古,中,新元古代沉积沉积层的新同位素和地球化学数据。全岩石的主要和微量元素地球化学表明,所有单元的主要来源具有与平均上陆壳相似的组成。由于这些花岗岩的地壳起源,即使对于晚些的埃迪卡拉纪花岗岩,其地球化学也很相似,其源成分来自稍老的埃迪卡拉纪花岗岩。尽管在某些情况下仍存在不确定性,但基于碎屑锆石,化石含量,层间火山岩和同位素地球化学的年龄限制证实了古,中,新元古代的演替。碎屑锆石数据显示,太古代(3.3–2.8 Ga)对古元古代(2.2–1)具有优势。9 Ga),次元中生代(1.5–1.3和1.1 Ga)和新元古代(0.5–0.6 Ga)年龄。Lu-Hf锆石和Sm-Nd整个岩石模型时代证实,太古代和古元古代是源区的主要地壳生长时期。U–Pb碎屑锆石年龄分布和模型年龄表明,NicoPérezTerrane而非Ríode la Plata Craton是西部Dom Feliciano带大部分沉积岩的来源。同样,对太古代,古,中,新元古代事件的比较也证明了尼科·佩雷斯·特拉恩(NicoPérezTerrane)可能代表了刚果克拉通的一部分。Lu-Hf锆石和Sm-Nd整个岩石模型时代证实,太古代和古元古代是源区的主要地壳生长时期。U–Pb碎屑锆石年龄分布和模型年龄表明,NicoPérezTerrane而非Ríode la Plata Craton是西部Dom Feliciano带大部分沉积岩的来源。同样,对太古代,古,中,新元古代事件的比较也证明了尼科·佩雷斯·特拉恩(NicoPérezTerrane)可能代表了刚果克拉通的一部分。Lu-Hf锆石和Sm-Nd全岩石模型年龄证实了太古宙和古元古代是源区的主要地壳生长时期。U–Pb碎屑锆石年龄分布和模型年龄表明,NicoPérezTerrane而非Ríode la Plata Craton是西部Dom Feliciano带大部分沉积岩的来源。同样,对太古代,古,中,新元古代事件的比较也证明了尼科·佩雷斯·特拉恩(NicoPérezTerrane)可能代表了刚果克拉通的一部分。

更新日期:2021-01-28
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