IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
capítulos de libros
Título:
Environmental controls and facies architecture of a jurassic carbonate episode La Manga Formation), Mendoza Province, Neuquén Basin
Autor/es:
RICCARDI, ALBERTO C.; PALMA, RICARDO MANUEL; LOPEZ-GOMEZ, J.; BRESSAN, GRACIELA SUSANA; MARTÍN-CHIVELET, JAVIER
Libro:
Opening and closure of the Neuquén Basin in the southern Andes
Editorial:
Springer
Referencias:
Año: 2020; p. 75 - 105
Resumen:
La Manga Formation is an extended carbonate system developed in Neuquén Basin.The age is based in ammonite faunas, ranging from Early Callovian (Bodenbenderi-Proximum Zone) to Middle Oxfordian (Cordatum Standard Zone to the TransversariumStandard Zone, and probably to the lower part of the Bifurcatus Standard Zone). A stratigraphical and sedimentological analysis in the outcrops exposed in the south of Mendoza province, enabled the recognition of five facies associations corresponding to distal-outer and proximal outer carbonate ramp, middle ramp, and a complex record of inner ramp deposits (shoreface, shoal, patch reef, shalow subtidal lagoon and tidal flat), as well as paleokarstic facies. These facies correspond to an homoclinal to distally steepened carbonate ramp. The facies associations are included into three third-order depositional sequences (DS-1, DS-2, DS-3) represented by transgressive and highstand system tracts with sequence boundaries of regional importance. Different controls can be recognised in the deposition of this unit. The abrupt changes of facies,as well as paleokarst and epikarsts discontinuity surfaces in the successions provide important evidence in terms of depositional environment and vertical evolution of the carbonate ramp. Facies patterns are variable across the outcrop area and vertically through time because of a combination of ramp morphology, siliciclastic supply, sealevel changes and tectonic effects. In the southern sections considered, siliciclastic influx influenced the deposition of middle ramp facies later overlain by scleractinian patch reefs which grew up throughout progressive stages from aggradational to progradational facies in response to climate controls and nutrient levels influence. In northern outcrops, tectonic controls affected the ramp topography and influenced the development of distal deep marine facies. Shallow-subtidal cycles and peritidal cycles indicate a combination of allocyclic and autocyclic processes controllingaccommodation space and sediment accumulation.