Regional Network on Marine Geology

Transcrição

1 ISSN Outubro Nº Porto Alegre L. R. Martins* * COMAR Regional chairman Keywords: marine geology, network, Brazil, Uruguay, Argentina.

2 132 INTRODUCTION COMAR- South West Atlantic Coastal and Marine Geology Group - a co-operative network of marine geology laboratories of the southern Brazil, Uruguay and the northern Argentina, develops studies along the coastal zone and continental margin of the three participant countries. The seabed survey provides a series of important documents including continental margin sedimentation, coastal plain geology and mapping, coastal and marine economic mineral resources, sedimentary sequences and hydrocarbon potential of the marginal basins, Pleistocene/Holocene paleogeographic evolution, coastal plain environments and processes, beach erosion and other management problems and study methodologies. Regional training courses, workshops and seminars are developed according to the IOC-UNESCO component TEMA (Training Educational and Mutual Assistance). The COMAR network also maintains regional and inter-regional data interchange with other similar groups. REGIONAL COMPONENTS The cooperative network is currently integrated by nine laboratories linked with Universidade Federal do Rio Grande Sul UFRGS, Universidade do Vale do Itajaí - UNIVALI, Universidade Federal de Santa Catarina UFSC, Fundação Universidade Federal do Rio Grande FURG (Brasil); Servicio de Oceanografia, Hidrografia y Meteorologia de La Armada SOHMA, Universidad de La Republica (Uruguay); Universidad Nacional de La Plata UNLP, Universidad Nacional de Mar del Plata UNMDP and Centro de Oceanografia de Buenos Aires COBA (Argentina). The research in the area is developed according to the South West Atlantic component of the Programme on Ocean Science in relation to Non Living Resources OSNLR, and its projects Continental Margin Environments and Mineral Resources COMEMIR and Coastal Zone as a Resource on its own Right CZAR, under the auspices of the Intergovernmental Oceanographic Comission IOC of UNESCO, and financial support of the Organization of American States OAS and national agencies (CNPq, Brazil; CONICET, Argentina and CONYCIT, Uruguay). DISCUSSION The OSNLR global program active from 1986 to 2002, represented the catalyser agent for the establishment, development and consolidation of the South West Atlantic subprogram now grouped (since 2003) through COMAR, which maintains the study pilot area, from Cabo Frio (Brazil) to Peninsula Valdés (Argentina) and the basis of COMEMIR and CZAR projects. The pilot area exhibits a complex series of sedimentary environments developed across the Pleistocene coastal plain (mainly beaches, dunes, lagoons, barriers, deltas, estuaries, river valleys and marshes) that were identified due to the analysis of the sedimentary properties, high resolution seismic profiles, datings and fauna and flora assemblages. When the sea level rose and started its landward migration with temporary stillstands, during a large part of Holocene, the new dynamics was responsible for the drowning of the Pleistocene coastal plain, generating a large variety of new features (erosional/deposicional), covering totally or partially the old features and recasting of sediments adjusted to the new hydraulic conditions occurring in the continental margin, including those of economic importance, like terrigenous sand and gravel, carbonate sand and gravel, heavy minerals, phosphatic nodules and glauconitic sand. Due to detailed mapping and petrologic studies of the transitional sedimentary environments developed along the continental margin of southern Brazil, Uruguay and northern Argentina it was possible to follow its Quaternary evolution. A large amount of observations and data were also obtained regarding the scientific and socio-economic aspects of the coastline erosion along the pilot area. RESULTS Papers Important contributions were published about different aspects of the coastal and marine

3 L. R. Martins 133 geology of the pilot area as a result of the OSNLR/COMAR projects. They are listed on MARTINS & BARBOZA (2001). Papers published from 2001 to 2003 are shown as reference annex at the end of this note. Training activities Graduate regional courses were offered as a TEMA exercise, during the almost twenty years of OSNLR/COMAR work, including some of floating university type. Topics of the regional courses are: a) Coastal Plain Geology, b) Marginal Basin Analysis, c) Phosphorite and Offshore Minerals, d) Gravity Flows: mechanisms and economic importance, e) Marine Minerals f) Marine Clastic Sedimentation Professionals from Brazil, Uruguay, Argentina, Chile, Equador, Peru, Colombia, Venezuela and Cuba participate in one or more of these activities. Many gradute students from Latin America develop dissertations, using data obtained through OSNLR/COMAR projects. REFERENCES 1986 to 2002, consult introduction chapter of: MARTINS, L. R. & BARBOZA, E. G Bibliography for South West Atlantic. Cabo Frio (Brazil) to Península Valdés (Argentina) , IOC- UNESCO/OAS/MCT Publication CD- ROM (full papers) AYUP ZOUAIN R. N; FERREIRA, H. P. L.; BARBOZA, E. G. & TOMAZELLI, L. J Evidência Morfológica de um Paleocanal Holocênico da Laguna Mirim nas adjacências do Banhado do Taim, Associação Brasileira de Estudos do Quaternário, Congresso 9º, Anais, CD-ROM 5 pgs., 6 figs., Recife, BARBOZA, E. G. & TOMAZELLI, L. J Erosional Features of the Eastern Margin of the Patos Lagoon, Southern Brazil: Significance for Holocene History. Journal of Coastal Research, Special Issue 35: , Itajaí, BARCELOS, R. L. & FURTADO, V. V Caracterização dos Componentes da Fração Arenosa (0,500-0,250 mm) no Canal São Sebastião. Pesquisas em Geociências, 28 (2): 35-52, Porto Alegre, BARLETTA, R. C. & CALLIARI, L. J Determinação da Intensidade das Tempestades que atuam no litoral do Rio Grande do Sul, Pesquisas em Geociências, 28 (2): , Porto Alegre, BARLETTA, R. C. & CALLIARI, L. J An Assessment of the Atmospheric and Wave Aspects determining beach morphodynamic characteristics along the central coast of RS, Southern, Journal of Coastal Research, Special Issue 35: , Itajaí, BUCHMANN, F. S. C.; SEELIGER, M.; ZANELLA, L. R. C.; MADUREIRA, L. S. P.; TOMAZELLI, L. J. & CALLIARI, L. J Análise Batimétrica e Sedimentológica no Estudo do Parcel do Carpinteiro, uma paleolinha de praia Pleistocênica na antepraia atual do Rio Grande do Sul, Pesquisas em Geociências, 28 (2): , Porto Alegre, BUCHMANN, F. S. C. & TOMAZELLI, L. J Relict Nearshore Shoals of Rio Grande do Sul, Southern Brazil: origin and effects on nearby modern beaches. Journal of Coastal Research, Special Issue 35: , Itajaí, BUCHMANN, F. S. C.; CARON, F.; LOPES, R. P. & TOMAZELLI, L. J Traços fósseis (paleotocas e crotovinas) da megafauna extinta no Rio Grande do Sul, In: Associação Brasileira de Estudos do Quaternário, Congresso, 9º, Anais, CD- ROM, 5 pgs., 4 figs., Recife, CALLIARI, L. J.; BOUKAREVA, I.; PIMENTA, F. & SPERANSKI, N Classification of Southern Brazilian Coast according to storm wave pattern and geomorphologic evidence of coastal erosion. Journal of Coastal Research, Special Issue 35: , Itajaí,

4 134 CLEROT, L. C. P.; MEDEANIC, J.; TORGAN, L. C.; DILLENBURG, S. R. & TOMAZELLI, L. J Evolução da Barreira IV na região do Cassino, RS. Associação Brasileira de Estudos do Quaternário.Congresso, 9º, Anais, CD- ROM, 4 pgs., 2 figs., Recife, CORREA, I. C. S. & ELIAS, A. R. D Minerais Pesados dos Sedimentos de Fundo da Enseada de Caraguatatuba, São Paulo, Pesquisas em Geociências, 28 (1): 37-47, Porto Alegre, DILLENBURG, S. R; TOMAZELLI, L. J; MARTINS, L. R. & BARBOZA, E. G Modificações de Longo Período da linha de costa do Rio Grande do Sul. In: (L. R. Martins; E. E. Toldo Jr. & S. R. Dillenburg, editores). Erosão Costeira: Causas, análise de risco e suas relações com a gênese de depósitos minerais OAS/IOC- UNESCO/MCT CD-ROM 3p. 7 mapas, Porto Alegre, DILLENBURG, S. R.; TOMAZELLI, L. J. & CLEROT, L. C. P Gradients of wave energy as the main factor controlling of the coast of Rio Grande do Sul in Southern Brazil during de late Holocene. In: International Symposium on Coastal Engineering and Science of Coastal Sediment Process, 5 th. CD-ROM, 9 pgs. 3 figs, New York, USA ESTEVES, L. S. & SANTOS, I. R Impacto Econômico da Erosão Costeira na praia do Hermenegildo, RS, Pesquisas em Geociências vol. 28 (2): , Porto Alegre, ESTEVES, L. S.; TOLDO Jr., E. E.; DILLENBURG, S. R. & TOMAZELLI, L. J Long and Short Term Coastal Erosion in Southern Journal of Coastal Research, Special Issue 36: , Itajaí, ESTEVES, L. S.; SILVA, A. R. P.; AREJANO, T. B.; PIVEL, M. A. G. & VRANJAC, M. P Coastal Development and Human impacts along Rio Grande do Sul Beaches, Journal of Coastal Research, Special Issue 35: , Itajaí, ESTEVES, L. S.; OLIVEIRA, V. R.; SILVA, A. R. P.; VRANJAC, M. P.; VANZ, A. & BARLETTA, R. C Seasonal Changes in Beach Profile inducing to response of Beachfront owners in Southern Journal of Coastal Research, Special Issue 35: , Itajaí, GRUBER, N. L. S.; TOLDO Jr., E. E.; BARBOZA, E. G. & NICOLODI, J. L Equilibrium Beach and Shoreface Profile of the Rio Grande do Sul Coast, South Journal of Coastal Research, Special Issue 35: , Itajaí, GRUBER, N. L. S.; BARBOZA, E. G. & NICOLODI, J. L Geografia dos Sistemas Costeiros e Oceanográficos: Subsídios para Gestão Integrada da Zona Costeira. Gravel 1: 81-89, Porto Alegre, LIMA, S. F.; ALMEIDA, L. E. S. B & TOLDO Jr. E. E Estimativa da capacidade de Transporte Longitudinal de Sedimento a partir de dados de ondas para a Costa do Rio Grande do Sul. Pesquisas em Geociências, 28 (2): , Porto Alegre, MARTINS, L. R; TOLDO Jr., E. E & DILLENBURG, S. R Erosão Costeira: Causas, análise de risco e sua relação com a gênese de depósitos minerais. OAS/MCT/CNPq CD-ROM, Porto Alegre, MARTINS, L. R. & BARBOZA, E. G Bibliography for South West Atlantic. Cabo Frio (Brazil) to Península Valdés (Argentina) IOC- UNESCO/MCT/CNPq CD-ROM, Porto Alegre, MARTINS, L. R Recent Sediments and Grain Size Analysis. Gravel 1: , Porto Alegre, MARTINS, L. R.; MARTINS, I. R. & URIEN, C. M Aspectos Sedimentares na Plataforma Continental na área de influência do Rio de La Plata. Gravel 1: 68-80, Porto Alegre, MARTINS, L. R.; URIEN, C. M. & MARTINS, I. R Modelos Deposicionais Marinhos e Recursos Minerais Associados. Gravel 1: Porto Alegre, MARTINS, L. R.; MARTINS, I. R. & TABAJARA, L. L Ocorrência de Fragmentos de Lama na Praia do Cassino, RS, Gravel 1: 47-53, Porto Alegre, MARTINS, L. R.; BARBOZA, E. G. & CARUSO Jr., F Southern Brazilian Marine Mineral Occurrences and Deposits. Gravel 1: 25-39, Porto Alegre,

5 L. R. Martins 135 MARTINS, L. R A Geologia Marinha Brasileira e os Programas Internacionais. Gravel 1: 1-24, Porto Alegre, MARTINS, L. R Hidratos de Metano: um interesse crescente. Gravel 1: , Porto Alegre, MARTINS, L. R Marine Minerals Occurrences and Deposits: Southern Brazilian Continental Margin. IMMS Newsletter, Soundings: 8-16, Honolulu, USA. NICOLODI, J. L Morfodinâmica de Praias: uma ferramenta para gestores de ambientes costeiros O caso da Praia de Fora, Parque Estadual de Itapuã, RS. Natureza e Conservação, vol. 1: 2: PEREZ, J. C.; SANTOS, M. A. V. & CALLIARI, L. J Numeric Modeling for Assessing Beach Profile Changes in Cassino Beach, RS, Journal of Coastal Research, Special Issue 35: , Itajaí, PIVEL, M. A. G.; SPERANSKI, N. & CALLIARI, L. J A Erosão Praial na Costa Atlântica Uruguaia. Pesquisas em Geociências 28 (2): , Porto Alegre, SARAIVA, J. M. B.; BEDRAN, C. & CARNEIRO, C Monitoring of Storm Surges on Cassino Beach, RS, Journal of Coastal Research Special Issue 35: , Itajaí, SERAU, A. K. & CALLIARI, L. J Changes of an Oceanic Beach Face in the Extreme South of Brazil, during the passage of a coastal storm. Journal of Coastal Research, Special Issue 35: , Itajaí, SCHETTINI, C. A. F. & TOLDO Jr., E. E Modos de Transporte de Sedimentos Finos no Estuário do Rio Itajaí, SC. Pesquisas em Geociências, 28 (2): , Porto Alegre, SILVA, R. P.; CALLIARI, L. J. & TOZZI, H. A The Influence of Washouts on the Erosive Susceptibility of the Rio Grande do Sul Coast between Cassino and Chuí Beaches, Southern Journal of Coastal Research, Special Issue 35: , Itajaí, SPERANSKI, N & CALLIARI, L. J Bathymetric Lenses and Localized Coastal Erosion in Southern Journal of Coastal Research, 34: , New Zeland. TABAJARA, L. L.; MARTINS, L. R. & NICOLODI, J. L Programa de Manejo de Dunas das Praias de Osório, RS. Pesquisas em Geociências, 28 (2): , Porto Alegre, TOLDO Jr., E. E; ALMEIDA, L. E. S. B. & CORRÊA, I. C. S Forecasting Shoreline Changes of Lagoa dos Patos Lagoon, Journal of Coastal Research, Special Issue 35: 43-50, Itajaí, TOLDO Jr., E. E.; ALMEIDA, L. E. S. B.; ESTEVES, L. S. & NICOLODI, J. L Shoreface Width as a function of longshore transport. International Symposium on Coastal Engineering and Science of Coastal Sediment Processes, Proceedings: CD- ROM, vol. 1, New York, USA. TOMAZELLI, L. J.; DILLENBURG, S. R. & VILLWOCK, J. A Sistemas Deposicionais Quaternários da Planície Costeira do Rio Grande do Sul, In: Quaternário de Países de Línguas Ibéricas, Congresso, 1º, Anais, 1: , Lisboa, Portugal. TOMAZELLI, L. J.; DILLENBURG, S. R.; BARBOZA, E. G. & STRIM, J O Sistema de Dunas Eólicas Transgressivas do Litoral Norte do Rio Grande do Sul: situação atual e definição de áreas prioritárias à preservação. Associação Brasileira de Estudos do Quaternário, Congresso, 9º, Anais, CD-ROM, 4 pgs., 8 figs., Recife, TOMAZELLI, L. J.; VILLWOCK, J. A; BACHI, F. A. & DEHNHARDT, M. B Geologia da Planície Costeira do Rio Grande do Sul. In: (L. R. Martins; E. E. Toldo Jr. & S. R. Dillenburg, editores). Erosão Costeira: Causas, análise de risco e suas relações com a gênese de depósitos minerais OEA/IOC-UNESCO/MCT CD- ROM, 3p. 7 mapas, Porto Alegre, URIEN, C. M.; MARTINS, L. R. & MARTINS, I. R Paleoplataformas e Progradação Deltaica do Neógeno na Margem Continental do Uruguai e norte da Argentina. Gravel 1: 40-46, Porto Alegre,

6 136 URIEN, C. M.; CAZENAVE, P. & MARTINS, L. R Manejo y Procesamiento de Información Oceanográfica. Gravel 1: 54-67, Porto Alegre, VINTEM, G.; TOMAZELLI, L. J. & KLEIN, A. H. F O efeito do tamanho de grão de areia no processo de transporte eólico dos campos de dunas transgressivos do litoral do Estado de Santa Catarina, In: Associação Brasileira de Estudos do Quaternário, Congresso, 9º, Anais. CD- ROM, 3 pgs., 2 figs., Recife,