Oxfordian reef architecture of the La Manga Formation, Neuquén Basin, Mendoza Province, Argentina

The Neuquén back-arc basin is located on the west margin of the South American platform between latitudes 36° and 40° S. The basin is famous for its continuous sedimentary record from the Late Triassic to Cenozoic comprising continental and marine clastic, carbonate, and evaporitic deposits up to 2....

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Autor principal: Palma, R.M
Otros Autores: Kietzmann, D.A, Adamonis, S., Gómez, J.L
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Publicado: 2009
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100 1 |a Palma, R.M. 
245 1 0 |a Oxfordian reef architecture of the La Manga Formation, Neuquén Basin, Mendoza Province, Argentina 
260 |c 2009 
270 1 0 |m Palma, R.M.; Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Pab. II, 1428 Buenos Aires, Argentina; email: palma@gl.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a The Neuquén back-arc basin is located on the west margin of the South American platform between latitudes 36° and 40° S. The basin is famous for its continuous sedimentary record from the Late Triassic to Cenozoic comprising continental and marine clastic, carbonate, and evaporitic deposits up to 2.600 m in thickness. The stratigraphical and paleontological studies of the outcrops of the La Manga Formation, Argentina, located near the Bardas Blancas region, Mendoza province (35° S and 69° O) allow the reconstruction of the sedimentary environments of an Oxfordian carbonate ramp, where outer ramp, middle ramp, inner ramp (oolitic shoal), inner ramp margin (patch reef) lagoon and paleokarst were differentiated. The reefs consist of back reef facies and in situ framework of coral boundstones that was formed at the top of shallowing-upward succession. Coral reefs were analyzed by defining coral colonies shapes, paleontological content, coral diversity and taphonomy studies. In some studied sections abundant fragments of gryphaeids, encrusting bryozoans, and isolated sponges provided a suitable substrate for coral colonization; however, other sections show an increase in the proportions of ooids, peloidal and coral intraclasts. The core reef facies is composed of white-grey unstratified and low diversity scleractinian coral limestone dominated by robust and thinly branching corals with cerioid-phocoid growths and massive coral colonies with meandroid-thamnasteroid growth forms. The assemblage is characterized by Actinastraea sp., Australoseris sp., Thamnasteria sp. and Garateastrea sp. Internal facies organization and different types of coral colonies allow to recognize the development of varying framework as well as intercolony areas. A superstratal growth fabric characterizes the coral assemblage. On the basis of coral growth fabric (branche and domal types), the reef of La Manga Formation is considered a typical mixstones. The intercolony areas consist of biomicrites and biomicrorudites containing abundant coral fragments, parautochthonous gryphaeids and another bivalves (Ctenostreon sp.), gastropods (Harpagodes sp., Natica sp.), echinoderms test and spines (Plegiocidaris sp.), miliolids, Cayeuxia sp., Acicularia sp., Salpingoporella sp., intraclasts, ooids, peloids and coated grains. The domal growth forms are probably more protected against biological and physical destruction, meanwhile delicate branching growth forms with very open and fragile framework were more affected and fragmented due to wave action and bioerosion. The reef fabric shows different intervals of truncation as consequence of erosion resulting from coral destruction by storm waves or currents. The maximum flooding surface separates oolitic shoal facies below from the aggradational and progradational coralline limestones facies above. Subsequent sea-level fall and karstification (148 Ma) affected reef and oolitic facies. © 2009 Elsevier B.V. All rights reserved.  |l eng 
536 |a Detalles de la financiación: Universidad de Buenos Aires, X-133, X-476 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP-5142 
536 |a Detalles de la financiación: Research supported by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (grant PIP-5142 ) and by the Universidad de Buenos Aires (grants X-133 , X-476 ). The work is dedicated to Dr. Pedro N. Stipanicic for the essential contribution to Geological Sciences through many years of academic and scientific work. Special thanks to Brian Jones (Editor) and one anonymous reviewer for opinions, comments and critical refereeing of the manuscript. We also wish to express our thanks to our colleagues Lic. R. Piethé and Lic. G. Bressan for companionship in the field. We are also indebted to Dr. A. Riccardi (Universidad Nacional de La Plata, Buenos Aires) for identifying the ammonite finding, and to Dr. A. Baez (Universidad de Buenos Aires) for improving the English. Likeweise the authors wish to thank the authority of the Recursos Naturales de la Provincia de Mendoza-Delegación Malargüe for the assistance during the field work. 
593 |a Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Pab. II, 1428 Buenos Aires, Argentina 
593 |a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina 
593 |a Instituto de Geología Económica, CSIC-UCM, Facultad de Ciencias Geológicas, Antonio Nováis 2, 28040 Madrid, Spain 
651 4 |a ARGENTINA 
651 4 |a NEUQUEN BASIN 
651 4 |a ARGENTINA 
651 4 |a MENDOZA 
651 4 |a NEUQUEN BASIN 
651 4 |a SOUTH AMERICA 
690 1 0 |a OXFORDIAN 
690 1 0 |a REEF 
690 1 0 |a BIOSTRATIGRAPHY 
690 1 0 |a CARBONATE PLATFORM 
690 1 0 |a CARBONATE RAMP 
690 1 0 |a CORAL REEF 
690 1 0 |a DEPOSITIONAL ENVIRONMENT 
690 1 0 |a LAGOONAL SEDIMENTATION 
690 1 0 |a MICRITE 
690 1 0 |a OXFORDIAN 
690 1 0 |a PALEOENVIRONMENT 
690 1 0 |a PALEONTOLOGY 
690 1 0 |a RECONSTRUCTION 
690 1 0 |a TAPHONOMY 
690 1 0 |a ACETABULARIA 
690 1 0 |a ANTHOZOA 
690 1 0 |a BIVALVIA 
690 1 0 |a BRYOZOA 
690 1 0 |a ECHINODERMATA 
690 1 0 |a GASTROPODA 
690 1 0 |a GRYPHAEIDAE 
690 1 0 |a MILIOLINA 
690 1 0 |a NATICA 
690 1 0 |a SCLERACTINIA 
690 1 0 |a THAMNASTERIA 
700 1 |a Kietzmann, D.A. 
700 1 |a Adamonis, S. 
700 1 |a Gómez, J.L. 
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