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	Provedor de dados Ameghiniana (1) Anais da ABC (AABC) (1) Autor Barbosa,José A. (1) Benedetto,Juan L. (1) Cech,Norma (1) Neumann,Virgínio H. (1) Raviolo,Mariana M. (1) Palavra-chave Lower Ordovician (2) Argentine Precordillera (1) Brachiopods (1) Carbonates (1) Chert (1) Early diagenesis (1) Eastern Precordillera (1) Paleoecology (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2009 (1) 2006 (1) País Argentina (1) Brazil (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última An outer-ramp brachiopod assemblage from the uppermost San Juan Formation (middle Arenig), northern Argentine Precordillera: paleoecologic and biogeographic implications Ameghiniana Benedetto,Juan L.; Cech,Norma. Rhynchonelliformean brachiopods from the Arenig outer-ramp carbonate facies exposed at the Guandacol-Gualcamayo depocenter (northern Precordillera basin) include the new species Orthidium guandacolensis , Taffia ( Chaloupskia ) minima and Leptella ( Petroria ) ventrocristata . Associated taxa are Archaeorthis sp., Ffynnonia sp. and Tritoechia ( Tritoechia ) sp. The overlying basinal black shales (Gualcamayo Formation) have yielded Pelonomia ? sp. On the basis of the age of Ffynnonia occurrences in western Gondwana it is suggested that this genus migrated from the Famatina back-arc basin to the open platform waters of the northern Precordillera basin and then to shallower water settings of the carbonate ramp located to the south (in present coordinates).... Tipo: Info:eu-repo/semantics/article Palavras-chave: Lower Ordovician; Argentine Precordillera; Brachiopods; Paleoecology. Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000100003 Characteristics, distribution and diagenetic stages of chert in the La Silla Formation (Lower Ordovician), Argentine Precordillera Anais da ABC (AABC) Raviolo,Mariana M.; Barbosa,José A.; Neumann,Virgínio H.. The late Cambrian - late Tremadocian La Silla Formation is a carbonate unit of the eastern Precordillera in Argentina whose facies indicate a shallow platform environment. Until this moment, there were no studies that referred to the diagenetic evolution of these rocks. The present study involves the characteristics and distribution of the silicification that affects this unit and determines its different diagenetic stages through petrographic (with cathodoluminescence support) and stratigraphic analyses. An early diagenetic chert, in a stage previous to the compactation, was observed. This chert is related to silica-rich seawater in contact with permeable and porous sediments. A later pulse of chert, associated with fracturing, also occurs. The knowledge... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbonates; Chert; Early diagenesis; Eastern Precordillera; Lower Ordovician. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400015 Registros recuperados: 2 Primeira ... 1 ... Última

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