A.S
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 D1+dos syntectonic leucosome from both basement and supracrustals, and defined a ca. 5step 30 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).
No matter if one among them plutons mix-cut the CFTD within the NW suggestion, new Silva Jardim Pluton, dated on 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. ).
Throughout the adjacent China Terrane ( Figs. dos and 3), there are also metamorphic age california. 550 – 510 Ma ( Schmitt et al. 2004 Schmitt Roentgen.S., Trouw R.An excellent.J., Van Schmus W.R., Pimentel Yards.M. 2004. Late amalgamation on main element of West Gondwana: the latest geochronological investigation and also the characterization regarding an effective Cambrian collisional orogeny on the Ribeira Buckle (SE Brazil). Precambrian Browse , -61. , 2012a Schmitt R.S., Mendes J.C., Peternel Roentgen., Silva L.C., Dantas E.L. 2012a. : SSAGI, Medellin, Colombia. ; Fernandes et al. 2015 Fernandes G.L., Schmitt R.S., Bongiolo Age., Mendes J.C., Basei Meters. 2015. Unraveling brand new tectonic development out-of a great Neoproterozoic-Cambrian effective margin in the Ribeira Orogen (SE Brazil): U-Pb and you can Lu-Hf provenance study. Precambrian Research , -360. ). Furthermore, several plutons having age from 510 in order to 480 Ma intrude which terrane and are generally translated since the blog post-tectonic ( Valeriano ainsi que al. 2011 Valeriano C.M., Tupinamba Meters., Simonetti Good., Heilbron M., Almeida J.C.H., Eirado L.Grams. 2011. U-Pb Los angeles-MC-ICPMS geochronology off Cambro-Ordovician article-collisional granites of your own Ribeira strip, southeast Brazil: critical Brasiliano magmatism inside central Gondwana supercontinent. Diary out of South American World Sciences , -428. ). dos and step 3) ( Moraes 2009 Moraes J.Meters. 2009. Geologia perform Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica dos Terrenos Chinese language e Cabo Frio. Learn Thesis UERJ. 65 p. ). So it pluton merchandise a formulated igneous foliation that will be considered good late-collisional magmatic looks ( Moraes 2009 Moraes J.Meters. 2009. Geologia perform Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica 2 Terrenos Chinese language elizabeth Cabo Frio. Grasp Thesis UERJ. 65 p. ). The youngest magmatic intrusions registered on CFTD within the Paleozoic was article tectonic pegmatites and you can granites of ca. 440 Ma dated that have You-Pb when you look at the zircon ( Schmitt ainsi que al. 2004 Schmitt R.S., Trouw Roentgen.An excellent.J., Van Schmus W.R., Pimentel M.M. 2004. Later amalgamation about central section of Western Gondwana: the new geochronological studies while the characterization out of an effective Cambrian collisional orogeny regarding Ribeira Buckle (SE Brazil). Precambrian Browse , -61. , Bongiolo mais aussi al. 2015 Bongiolo Age., Renac C., D’Almeida de- Toledo P., Schmitt R.S., Faulstich F.R.L., Mexias , Silva F.P.C. 2015. Origin off pegmatites and you can fluids within Ponta Negra (RJ, Brazil) while in the later- to share-collisional levels of your own Gondwana Set up. Lithos , -275. ).