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The deformation and high grade metamorphism responsible for the tectonic inversion of the sedimentary basin is attributed to an orogenic event of Cambrian age. Schmitt et al. (200cuatro Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. , 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society, London , Special Publications, -296. ) dated the D_1+dos syntectonic leucosome from both basement and supracrustals, and defined a ca. 5step three0 Ma tectonometamorphic event related to a convergent margin that culminated with a continental collision (Buzios Orogeny). This partial melt product was generated during the metamorphic peak (D₁₊₂) and was folded by the megascale F₃-folds ( Fig. 4E).

Even if one of them plutons get across-slice the CFTD within the NW idea, the Silva Jardim Pluton, dated within 505 Ma ( Figs

In the basement, the lower intercepts of the U-Pb discordia lines are in the interval between 600 and 450 Ma, consistent with this event ( Schmitt et al. 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. , 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society, London , Special Publications, -296. ). The metamorphic rims of the Paleoproterozoic zircon grains in the shear zones are dated at ca. 505 Ma ( Schmitt et al. 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society, London , Special Publications, -296. ). In the supracrustals, all metamorphic minerals are formed during the Cambrian (ca. 530 Ma). Zircon, monazite, sphene and rutile were dated and yielded a metamorphic time interval between 525 and 510 Ma for the eastern CFTD and 505 – 490 Ma for the western CFTD ( Schmitt et al. 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. ). The occurrence of a late F₄-reclined megascale fold in the western region could partially explain this ( Fig. 3). These younger ages could indicate that units in this region stayed deeper in the crust and the D₄ deformational phase would bring them up later. The cooling rate calculated for the eastern part of CFTD is rapid until ca. 510 Ma (more than 20 o C/Ma), and after this diminishes to 5 – 10 o C/Ma ( Schmitt et al., 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. ).

On adjoining Chinese language Terrane ( Figs. dos and you may step three), there are even metamorphic ages of ca. 550 – 510 Ma ( Schmitt et al. 2004 Schmitt R.S., Trouw Roentgen.A good.J., Van Schmus W.R., Pimentel Yards.M. 2004. Late amalgamation on the main part of Western Gondwana: the fresh new geochronological investigation as well as the characterization out-of a Cambrian collisional orogeny regarding Ribeira Buckle (SE Brazil). Precambrian Lookup , -61. , 2012a Schmitt R.S., Mendes J.C., Peternel Roentgen., Silva L.C., Dantas Elizabeth.L. 2012a. : SSAGI, Medellin, Colombia. ; Fernandes mais aussi al. 2015 Fernandes G.L., Schmitt R.S., Bongiolo Age., Mendes J.C., Basei Meters. 2015. Unraveling the brand new tectonic progression from a beneficial Neoproterozoic-Cambrian energetic margin regarding Ribeira Orogen (SE Brazil): U-Pb and Lu-Hf provenance research. Precambrian Search , -360. ). In addition, a few plutons with many years out-of 510 in order to 480 Ma intrude that it terrane and therefore are interpreted while the article-tectonic ( Valeriano et al. 2011 Valeriano C.Meters., Tupinamba Meters., Simonetti A good., Heilbron Meters., Almeida J.C.H., Eirado L.G. 2011. U-Pb La-MC-ICPMS geochronology of Cambro-Ordovician blog post-collisional granites of your Ribeira strip, southeast Brazil: terminal Brasiliano magmatism within the central Gondwana supercontinent. Diary of Southern Western Environment Sciences , -428. ). dos and you can 3) ( Moraes 2009 Moraes J.M. 2009. Geologia carry out Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica 2 Terrenos Chinese language e Cabo Frio. Master Thesis UERJ. 65 p. ). So it pluton gift ideas a centered igneous foliation and that is experienced a great late-collisional magmatic human anatomy ( Moraes 2009 Moraes J.M. 2009. Geologia perform Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica 2 Terrenos Chinese language e Cabo Frio. Grasp Thesis UERJ. 65 p. ). The fresh new youngest magmatic intrusions registered in the CFTD when you look free chat room icelandic at the Paleozoic are post tectonic pegmatites and granites away from ca. 440 Ma old with U-Pb within the zircon ( Schmitt ainsi que al. 2004 Schmitt R.S., Trouw Roentgen.An excellent.J., Van Schmus W.Roentgen., Pimentel M.Meters. 2004. Later amalgamation from the main element of Western Gondwana: the geochronological data and also the characterization out-of a great Cambrian collisional orogeny regarding Ribeira Buckle (SE Brazil). Precambrian Research , -61. , Bongiolo et al. 2015 Bongiolo Age., Renac C., D’Almeida de Toledo P., Schmitt R.S., Faulstich F.Roentgen.L., Mexias , Silva F.P.C. 2015. Provider out-of pegmatites and you will drinks within Ponta Negra (RJ, Brazil) while in the later- to share-collisional amount of one’s Gondwana Installation. Lithos , -275. ).