%0 Journal Article
%T An¨¢lisis Estratigr¨¢fico Secuencial de las Formaciones Huincul y Lisandro del Subgrupo R¨ªo Limay (Grupo Neuqu¨¦n - Cret¨¢cico Tard¨ªo) en el Departamento El Cuy, R¨ªo Negro, Argentina
%A S¨¢nchez
%A M. L.
%A Rossi
%A J
%A Morra
%A S
%A Armas
%A P
%J Latin American journal of sedimentology and basin analysis
%D 2008
%I Scientific Electronic Library Online
%X in the cuy department, rio negro province (fig. 1), there are outcrops of the late cretaceous continental deposits of the subgroup rio limay (fig. 2), in virtually continuous exposures that allow detail studies and exploration of the architecture of the sedimentary bodies. this contribution presents the results of the sedimentological study and sequential stratigraphic analysis for the depositional period of the huincul and lisandro formations (subgroup r¨ªo limay). the outcrops appear in the planicie de rentar¨ªa (area a), with continuous sections longer than 3 km and anfiteatro (area b) with outcrops of more than 5 km (fig. 1). in these areas we made detailed sedimentological profiles (fig. 3), we described and interpreted lithofacies and architectural elements employing photograms and we defined stratigraphicaly significant discontinuities. we identified 11 fluvial lithofacies, 4 conglomerates (gm, gh, gp and gt), 5 sandstones (sm, st., sp, and mr. sh), and 2 pelitic (fl and fm), according to the nomenclature of miall (1996). in addition, 2 volcaniclastic lithofacies, 1 primary pyroclastic lithofacies (tlpm) and 1 volcaniclastic sineruptive lithofacies (tlpe) following criteria mc phie et al. (1993) were defined, and finally 3 eolic lithofacies (spe, she and sathya) (fig. 4). these were grouped into 11 fluvial architectural elements and 4 eolic (fig. 5). we have recognized channel elements (chi) and chii), intrachannel (la, dai, daii, sbi and sbii) and floodplain (cri, crii, cs and of). the eolic architectural elements include dunes (ed) and interdunes (di, and wi fi). the paleoenvironments sedimentary include river systems, terminal fans and dune fields. the sistema fluvial i (sf-i) is integrated by la, dai, daii, sbi, chi, cri, crii and of (fig. 6). the meanders loops show, in most cases, complete filling sequences in which records of migration of large sand dunes are preserved which retain topsets deposits and the scrolls their undulating tops. the channel belts
%K secuencia estratigr¨¢fica
%K sedimentolog¨ªa
%K subgrupo r¨ªo limay
%K grupo neuqu¨¦n
%K r¨ªo negro
%K stratigraphy sequence
%K sedimentology
%K r¨ªo limay sugroup
%K neuqu¨¦n group
%K r¨ªo negro.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1851-49792008000100001&lng=en&nrm=iso&tlng=en