%0 Journal Article
%T Depositional environments and stratigraphy of the Upper Cambrian-lower Ordovician Santa Rosita formation at the Alfarcito area, Cordillera Oriental, Argentina: integration of biostratigraphic data within a sequence stratigraphic framework
%A Buatois
%A Luis A.
%A Zeballo
%A Fernando J.
%A Albanesi
%A Guillermo L.
%A Ortega
%A Gladys
%A Vaccari
%A N. Emilio
%A Mangano
%A M. Gabriela
%J Latin American journal of sedimentology and basin analysis
%D 2006
%I Scientific Electronic Library Online
%X the upper cambrian-tremadocian rocks exposed in the alfarcito area of cordillera oriental, northwest argentina reveal a series of transgressive-regressive cycles punctuated by incision of fluvio-estuarine valleys. an integrated sedimentologic, biostratigraphic and sequence stratigraphic study permits characterization of the sedimentary facies and stratal stacking patterns, and a revision of the stratigraphic framework of this succession. the upper cambrian-tremadocian succession is included within the existing santa rosita formation, which is formally subdivided here into six units, the tilcara, casa colorada, pico de halc¨Žn, alfarcito, rupasca and humacha members. this scheme recognizes the internal complexities of the formation, in that the tilcara and pico de halc¨Žn members record sedimentation in areally-restricted incised valleys and contain structures indicative of tidal dominance, whereas the casa colorada, alfarcito and rupasca members typify wave-dominated open-marine environments, where background suspension-fallout was punctuated by oscillatory flows during storms. the tilcara member is incised into the underlying mes¨Žn group. the casa colorada member reflects a basinwide late cambrian transgression and subsequent progradation and consists of lower to upper offshore deposits. the pico de halc¨Žn member is incised into the casa colorada member. the alfarcito member is divided into three distinctly upward-coarsening and-thickening intervals. the sandstone-dominated intervals are composed of lower to middle shoreface deposits with minor amounts of offshore transition and upper shoreface deposits. the heterolithic, fine-grained intervals record more distal deposition, ranging from the lower offshore to the offshore transition. the rupasca member is a dominantly fine-grained unit that records a major late early to early late tremadocian transgression. the lower interval of this member consists of lower offshore to offshore-transition deposits, while the upper p
%K facies analysis
%K sequence stratigraphy
%K biostratigraphy
%K shallow marine
%K cambrian-ordovician
%K argentina.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1851-49792006000100001&lng=en&nrm=iso&tlng=en