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Abstract:

Volcanic rocks in southern Uruguay are linked to an extensional tectonic regime related to the post-collisional Brasiliano-Pan African orogenic cycle. The ca 580 Ma magmatic event is recorded in the Playa Hermosa Formation. In the upper section of this formation several units were defined. The basal unit is a quartz-syenite brecciated deposit, interpreted as the result of explosive episodes of shallow plutonic quartz-syenite intrusion with signs of hydrothermal alteration. Sedimentary and basaltic lithoclasts are occasionally present in the breccia, implying the emplacement of basalts before of that magmatic event. The middle unit is composed of trachytic hyaloclastites. Local distribution and textural evidence indicate that trachytic volcanic pulses have been followed by an explosive event that produced brecciated deposits. The upper unit of the studied sequence is composed of basalts with thin sedimentary intercalations. Most of the outcropping basalts display the typical micro- and macro-features of hyaloclastites; distinctive of extrusions occurred in wet sediments previous to lithification. Basaltic feeder dikes are common in the lower unit. The study of flow structures in the quartz-syenite brecciated deposits led to the recognition of two basaltic inputs. Such differences are related to the intensity of chloritic alteration, which would be related to water contamination. Basaltic peperites are one of the most impressive features of the Playa Hermosa Formation. Hyaloclastites and peperites largely represented among the studied volcanic rocks, and devitrification textures are all evidences of magma/seawater interactions. In the basaltic fragments of the peperites well preserved orange palagonite appears, while the sandstone fractions have lithic clasts of felsic volcanic rocks, such as rhyolitic lavas with perlitic cracks and lithophysae-like structures. Palagonite chemical analyses suggest marine environment and, at the same time, it proves that the studied section lacks of regional metamorphism. The felsic volcanic lithoclasts contained in sandstones could be related to the felsic volcanic lobes intercalations. The studied magmatic event is important in order to formulate correlations with other Neoproterozoic units distributed around the Dom Feliciano belt, like Camaquã and Campo Alegre basins (Brazil), and in the Kaoko belt (NW Namibia) in Africa. Also, Playa Hermosa Formation presents glacigenic features that are well documented, and reinforce the volcanism around 580 Ma in the Rio de la Plata Craton. © 2009 International Association for Gondwana Research.

Registro:

Documento: Artículo
Título:Neoproterozoic subaqueous extrusive-intrusive rocks in the Playa Hermosa Formation in Uruguay: Regional and stratigraphic significance
Autor:Sánchez-Bettucci, L.; Koukharsky, M.; Pazos, P.J.; Stareczek, S.
Filiación:Facultad de Ciencias, Universidad de la República, Departamento de Geología, Igua 4225, Malvin Norte, CP 11400, Montevideo, Uruguay
CONICET - Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon II, piso 1, CP 1428 Ciudad Autonoma de Buenos Aires, Argentina
Palabras clave:Neoproterozoic; Peperites; Playa Hermosa Formation; Quartz-syenite breccia; Uruguay
Año:2009
Volumen:16
Número:1
Página de inicio:134
Página de fin:144
DOI: http://dx.doi.org/10.1016/j.gr.2009.01.002
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v16_n1_p134_SanchezBettucci

Referencias:

  • Almeida de, D.P., Zerfass, H., Basei, M.A.S., Petra, K., Heredia Gomes, C., The Acampamento Velho Formation, a Lower Cambrian Bimodal Volcanic Package: Geochemical and Stratigraphic Studies from the Cerro Do Bugio, Perau and Serra De Santa Bárbara (Caçapava do Sul, Rio Grande do Sul, RS - Brazil) (2002) Gondwana Research, 5, pp. 721-733
  • Bailey, D.K., The chemical and thermal evolution of rifts (1983) Tectonophysics, 94, pp. 585-597
  • Bonin, B., Do coeval mafic and felsic magmas in post-collisional to within-plate regimes neccessarily imply two contrasting, mantle and crustal sources? A Review (2004) Lithos, 78, pp. 1-24
  • Busby, C.J., White, J.D.L., Variation in peperite textures associated with differing host-sediment properties (1987) Bulletin of Volcanology, 49, pp. 765-775
  • Calver, C.R., Black, L.P., Everand, J.L., Seymur, D.B., U-Pb zircon age constraints on the late Neoproterozoic glaciation in Tasmania (2004) Geology, 32, pp. 893-896
  • Campanha, G.A.C., Basei, M.A.S., Tassinari, C.C.G., Nutman, A.P., Faleiros, F.M., Constraining the age of the Iporanga Formation with SHRIMP U-Pb zircon: Implications for possible Ediacaran glaciation in the Ribeira Belt, SE Brazil (2008) Gondwana Research, 13, pp. 117-125
  • Cingolani, C.A., Dalla Salda, L., Buenos Aires Cratonic Region (2000) Tectonic Evolution of South America, pp. 139-146. , Cordani U., Milani E., Thomaz Filho A., and Campos D. (Eds)
  • Citroni, S.B., Basei, M.A.S., Siga Jr., O., Neto, J.M.R., Volcanism and Stratigraphy of the Neoproterozoic Campo Alegre Basin, SC, Brasil (2001) Anais da Academia Brasileira de Ciencia, 73, pp. 581-597
  • Cordani, U.G., Sato, K., Teixeira, W., Tassinari, C.C.G., Basei, M.A.S., Crustal evolution of the South American Platform. The Amazonian Craton (2000) Tectonic evolution of South America, pp. 19-40. , Cordani U.G., Milani E.J., Thomáz Filho A., and Campos D.A. (Eds)
  • Dalla Salda, L., Bossi, J., Cingolani, C., The Rio de la Plata cratonic region of southwestern Gondwanaland (1988) Episodes, 11, pp. 263-269
  • Dott Jr., R.H., Bourgeois, J., Hummocky stratification: Significance of its variable bedding sequences (1982) Geological Society of America Bulletin, 93, pp. 633-680
  • Erola, E., Uutela, A., The stratigraphy of the Ediacaran volcano-sedimentary Picada das Graças alloformation (Bom jardim Allogroup) at Lavras do sul, southernmost brazil: A diamictite-lonestone association. CGC-04 Neoproterozoic ice ages: Quo vadis? (2008) 33 International Geological Congress, Oslo
  • Fambrini, G.L., Paes-De-Almeida, R., Riccomini, C., Fragoso-Cesar, A.R.S., Tempestitos com Influência Glacial da Formação Playa Hermosa (Neoproterozóico), Piriápolis, Uruguai (2003) Revista Brasileira de Geociências, 33, pp. 1-12
  • Fisher, R.V., Schmincke, H.U., (1984) Pyroclastic rocks, , Springer Verlag, Berlin 472 pp
  • Fragoso Cesar, A.R.S., O Cráton do Rio de La Plata e o Cinturão Dom Feliciano no Escudo Uruguaio-Sul-Riograndense (1980) XXXI Congreso Brasileiro de Geologia, 5, pp. 2879-2892
  • Fragoso Cesar, A.R.S., Almeida, R.P., Fambrini, G.L., Reis Pelosi, A.P.M., Janikian, L., A Bacia Camaquã: um sistema intracontinental anorogênico de rifts do Neoproterozóico III-Eopaleozóico no Rio Grande do Sul (2003) SBG, Enc. Estrat. RS - Escudos e Bacias, 1, Porto Alegre, RS., Anais, pp. 139-144
  • Frantz, J.C., Botelho, N.F., Neoproterozoic granitic magmatism and evolution of the eastern Dom Feliciano Belt in Southernmost Brazil: a tectonic model (2000) Gondwana Research, 3, pp. 7-19
  • Gaucher, C., Blanco, G., Chiglino, L., Poiré, D., Germs, G.J.B., Acritarchs of Las Ventanas Formation (Ediacaran, Uruguay): implications for the timing of coeval rifting and glacial events in western Gondwana (2008) Gondwana Research, 13, pp. 488-501
  • Goscombe, B.D., Gray, D.R., Structure and strain variation at mid-crustal levels in a transpressional orogen: a review of Kaoko Belt structure and the character of West Gondwana amalgamation and dispersal (2008) Gondwana Research, 13, pp. 45-85
  • Janikian, L., Almeida, R.P., Fragoso Cesar, A.R.S., Fambrini, G.L., Redefinição do Grupo Bom Jardim (Neoproterozóico III) em sua área-tipo: litoestratigrafia, evolução paleoambiental e contexto tectônico (2003) Revista Brasileira de Geociências, 33, pp. 349-362
  • Janikian, L., Almeida, R.P., Fragoso Cesar, A.R.S., de Araujo, C.R., de Corrêa, C.R., Reis Pelosi, A.P.M., Evolução Paleoambiental e Seqüências Deposicionais do Grupo Bom Jardim e da Formação Acampamento Velho (Supergrupo Camaquã) na porção Norte da Sub-Bacia Camaquã Ocidental (2005) Revista Brasileira de Geociências, 35, pp. 245-256
  • Janikian, L., Almeida, R.P., Trindade, R., Fragoso Cesar, A.R.S., D'Agrella-Filho, M., Elton, L., Tohver, E., The continental record of Ediacaran volcano-sedimentary successions in southern Brazil and their global implications (2008) Terra Nova, 20, pp. 259-266
  • Kawai, T., Windley, B.F., Terabayashi, M., Yamamoto, H., Isozaki, Y., Maruyama, S., Neoproterozoic glaciation in the mid-oceanic realm: An example from hemi-pelagic mudstones on Llanddwyn Island, Anglesey, UK (2008) Gondwana Research, 14, pp. 105-114
  • Kokelaar, B.P., Magma-water interactions in subaqueous and emergent basaltic volcanism (1986) Bulletin of Volcanology, 48, pp. 275-289
  • Masquelin, H., Sánchez Bettucci, L., Propuesta de evolución tectono-sedimentaria para la fosa tardi-brasiliana en la región de Piriápolis, Uruguay (1993) Revista Brasilera de Geociencias, 23, pp. 313-322
  • McPhie, J., Doyle, M., Allen, R., Volcanic textures. A guide to the interpretation of textures in volcanic rocks (1993) Tasmania, Tasmanian Government Printing Office, , 198 p
  • Meert, J.G., Liebarman, B.S., The Neoproterozoic assembly of Gondwana and its relationship to the Ediacaran-Cambrian radiation (2008) Gondwana Research, 14, pp. 5-21
  • Midot, D., 1984. Etude Géologique et Diagnostic Metallegénique pour l'Exploration du Sector de Minas (Uruguay). Tesis de Doctorado. Universitè de Paris IV, París, 175 pp; Orth, K., McPhie, J., Textures formed during emplacement and cooling of a Palaeoproterozoic, small-volume rhyolitic sill (2003) Journal of Volcanology and Geothermal Research, 128, pp. 341-362. , (2003)
  • Oyhantçabal, P., Siegesmund, S., Wemmer, K., Frei, R., Layer, P., Post-collisional transition from calc-alkaline to alkaline magmatism during transcurrent deformation in the southernmost Dom Feliciano Belt (Braziliano-Pan-African, Uruguay) (2007) Lithos, 98, pp. 141-159
  • Pazos, P., Tófalo, R., Sánchez Bettucci, L., Procesos sedimentarios e indicadores paleoclimáticos en la sección inferior de la Formación Playa Hermosa, Cuenca Playa Verde, Piriápolis, Uruguay (1998) II Congreso Uruguayo de Geología, pp. 64-69
  • Pazos, P., Sánchez Bettucci, L., Tófalo, R.O., The record of the Varanger glaciation at the Río de la Plata craton, Vendian-Cambrian of Uruguay (2003) Gondwana Research, 6, pp. 65-78
  • Pazos, P., Sánchez Bettucci, L., Loureiro, J., The Neoproterozoic glacial record in the Rio de la Plata Craton: a critical reappraisal (2008) West Gondwana: Pre-Cenozoic Correlations Across the South Atlantic Region, 294 of Special Publications, pp. 343-364. , Pankhurst R., Trouw R., de Brito Neves B., and de Wit M. (Eds), Geological Society of London
  • Pecoits, E., Gingras, M.K., Aubet, N., Konhauser, K.O., Ediacaran in Uruguay: Palaeoclimatic and palaeobiologic implications (2008) Sedimentology, 55, pp. 689-719
  • Pupin, J.P., (1980) Contribution to Mineralogy and Petrology, 73, pp. 207-220
  • Ramanaidou, E., Noack, Y., Palagonites of the Red Sea: a new occurrence of hydroxysulphate (1987) Mineralogical Magazine, 51, pp. 139-143
  • Remus, M.V.D., McNaughton, N.J., Hartmann, L.A., Koppe, J.C., Fletcher, I.R., Groves, D.I., Pinto, V.M., Gold in the Neoproterozoic juvenile Bosso roca Volcanic Arc of southernmost Brazil: isotopic constraints on timing and sources (1999) Journal of South America Earth Sciences, 12, pp. 349-366
  • Sánchez Bettucci, L., Los Basaltos postorogénicos de la Región Piriápolis - Pan de Azúcar, República Oriental del Uruguay (1997) Revista de la Asociación Geológica Argentina, 52, pp. 3-16
  • Sánchez Bettucci, L., (1998) Evolución tectónica del Cinturón Dom Feliciano en la región Minas - Piriápolis, , Uruguay. PhD thesis, Universidad de Buenos Aires
  • Sánchez Bettucci, L., Linares, E., Primeras edades en basaltos del Complejo Sierra de Animas, Uruguay (1996) XII Congreso Geológico Argentino y III Congreso de Exploración de Hidrocarburos, 1, pp. 399-404. , Elsevier, Gondwana Research Buenos Aires
  • Sánchez Bettucci, L., Pazos, P., Análisis Paleoambiental y Marco tectónico en la Cuenca Playa Verde, Piriápolis, Uruguay (1996) XIII Congreso Geológico Argentino y III Congreso de Exploración de Hidrocarburos, I, pp. 405-412
  • Sánchez Bettucci, L., Rapalini, A.E., Paleomagnetism of the Sierra de Las Animas Complex, Southern Uruguay: its implications in the assembly of western Gondwana (2002) Precambrian Research, 118, pp. 243-265
  • Sánchez Bettucci, L., Cosarinsky, M., Ramos, V., Tectonic setting of the Late Proterozoic Lavalleja Group (Dom Feliciano Belt), Uruguay (2001) Gondwana Research, 4, pp. 395-407
  • Sánchez Bettucci, L., Oyhantçabal, P., Page, S., Ramos, V.A., Petrography and Geochemistry of the Carapé Complex, (Southeastern Uruguay) (2003) Gondwana Research, 6, pp. 89-105
  • Sánchez-Bettucci, L., Oyhantçabal, P., Preciozzi, F., Loureiro, J., Ramos, V.A., Basei, M.A.S., Mineralizations of The Lavalleja Group (Uruguay), A Neoproterozoic Volcano - Sedimentary Sequence (2004) Gondwana Research, 7, pp. 745-751
  • Sander, A., Toniolo, J.A., Gil, C.A.A., da, C., Lopes, R., Peperitos na Bacia do Camaquã, RS (2005) Abstract, 660. , III Simposio de Volcanismo e Ambientes Associados, Cabo Frio, RJ, Brazil
  • Skilling, I.P., White, J.D.L., McPhie, J., Peperite: a review of magma-sediment mingling (2002) Journal of Volcanology and Geothermal Research, 114, pp. 1-17. , Peperites: processes and products of magma-sediment mingling. Skilling I., White J.D.L., and McPhie J. (Eds)
  • Schmitt, R.S., Frimmel, H.E., Fairchild, T.R., Neoproterozoic-Early Paleozoic events in Southwest Gondwana: introduction (2008) Gondwana Research, 13, pp. 435-436
  • Stroncik, N.A., Schmincke, H.U., Evolution of palagonite: crystallization, chemical changes, and element budget (2001) Geochemistry Geophysics Geosystems, 2 (7), p. 1017
  • White, J.D.L., McPhie, J., Skilling, I.P., Peperite: a useful genetic term (2000) Bulletin of Volcanology, 62, pp. 65-66
  • Yamagishi, H., (1994) Subaqueous volcanic rocks, , Hokkaido University Press, Sapporo, Japan 195 pp
  • Zhou, Z., Fyfe, W.S., Palagonitization of basaltic glass from DSDP Site 335, Leg. 37: Textures, chemical composition, and mechanism of formation (1989) American Mineralogist, 74, pp. 1045-1053

Citas:

---------- APA ----------
Sánchez-Bettucci, L., Koukharsky, M., Pazos, P.J. & Stareczek, S. (2009) . Neoproterozoic subaqueous extrusive-intrusive rocks in the Playa Hermosa Formation in Uruguay: Regional and stratigraphic significance. Gondwana Research, 16(1), 134-144.
http://dx.doi.org/10.1016/j.gr.2009.01.002
---------- CHICAGO ----------
Sánchez-Bettucci, L., Koukharsky, M., Pazos, P.J., Stareczek, S. "Neoproterozoic subaqueous extrusive-intrusive rocks in the Playa Hermosa Formation in Uruguay: Regional and stratigraphic significance" . Gondwana Research 16, no. 1 (2009) : 134-144.
http://dx.doi.org/10.1016/j.gr.2009.01.002
---------- MLA ----------
Sánchez-Bettucci, L., Koukharsky, M., Pazos, P.J., Stareczek, S. "Neoproterozoic subaqueous extrusive-intrusive rocks in the Playa Hermosa Formation in Uruguay: Regional and stratigraphic significance" . Gondwana Research, vol. 16, no. 1, 2009, pp. 134-144.
http://dx.doi.org/10.1016/j.gr.2009.01.002
---------- VANCOUVER ----------
Sánchez-Bettucci, L., Koukharsky, M., Pazos, P.J., Stareczek, S. Neoproterozoic subaqueous extrusive-intrusive rocks in the Playa Hermosa Formation in Uruguay: Regional and stratigraphic significance. Gondwana Res. 2009;16(1):134-144.
http://dx.doi.org/10.1016/j.gr.2009.01.002