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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. (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. ) 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 (D_1+dos) and was folded by the megascale F₃-folds ( Fig. 4E).

Whether or not one of these plutons cross-cut the CFTD within its NW suggestion, the brand new Silva Jardim Pluton, dated at 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. ).

Regarding the surrounding China Terrane ( Figs. dos and you may step three), there are even metamorphic period of ca. 550 – 510 Ma ( Schmitt et al. 2004 Schmitt Roentgen.S., Trouw R.A great.J., Van Schmus W.R., Pimentel Meters.Meters. 2004. Late amalgamation throughout the central part of West Gondwana: the new geochronological investigation and characterization out of a good Cambrian collisional orogeny on Ribeira Buckle (SE Brazil). Precambrian Lookup , -61. , 2012a Schmitt Roentgen.S., Mendes J.C., Peternel Roentgen., Silva L.C., Dantas E.L. 2012a. : SSAGI, Medellin, Colombia. ; Fernandes et al. 2015 Fernandes G.L., Schmitt Roentgen.S., Bongiolo E., Mendes J.C., Basei Meters. 2015. Unraveling this new tectonic evolution off an effective Neoproterozoic-Cambrian energetic margin regarding the Ribeira Orogen (SE Brazil): U-Pb and Lu-Hf provenance studies. Precambrian Search , -360. ). Also, a series of plutons having years from 510 in order to 480 Ma intrude this terrane and generally are interpreted because post-tectonic ( Valeriano mais aussi al. 2011 Valeriano C.Meters., Tupinamba Yards., Simonetti An effective., Heilbron Yards., Almeida J.C.H., Eirado L.G. 2011. U-Pb Los angeles-MC-ICPMS geochronology of Inmate dating review Cambro-Ordovician article-collisional granites of one’s Ribeira belt, the southern part of Brazil: critical Brasiliano magmatism in the main Gondwana supercontinent. Log off Southern American Planet Sciences , -428. ). dos and you may step 3) ( Moraes 2009 Moraes J.Yards. 2009. Geologia manage Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica dos Terrenos Chinese language age Cabo Frio. Learn Thesis UERJ. 65 p. ). It pluton gifts a depending igneous foliation which can be considered an effective late-collisional magmatic looks ( Moraes 2009 Moraes J.M. 2009. Geologia would Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica dos Terrenos Chinese language age Cabo Frio. Grasp Thesis UERJ. 65 p. ). The fresh youngest magmatic intrusions inserted about CFTD into the Paleozoic is blog post tectonic pegmatites and you will granites out-of california. 440 Ma old with You-Pb in the zircon ( Schmitt ainsi que al. 2004 Schmitt Roentgen.S., Trouw Roentgen.A great.J., Van Schmus W.R., Pimentel Meters.Yards. 2004. Later amalgamation from the central element of Western Gondwana: brand new geochronological study and also the characterization away from good Cambrian collisional orogeny from the Ribeira Strip (SE Brazil). Precambrian Research , -61. , Bongiolo ainsi que al. 2015 Bongiolo E., Renac C., D’Almeida de- Toledo P., Schmitt Roentgen.S., Faulstich F.Roentgen.L., Mexias , Silva F.P.C. 2015. Origin from pegmatites and you will drinks on Ponta Negra (RJ, Brazil) through the later- to create-collisional level of Gondwana Installation. Lithos , -275. ).