IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
artículos
Título:
Sedimentology and sequence stratigraphy of a Tithonian - Valanginian carbonate ramp (Vaca Muerta Formation): A misunderstood exceptional source rock in the Southern Mendoza area of the Neuquén Basin, Argentina
Autor/es:
KIETZMANN, D.A; PALMA, R.M; RICCARDI, C.A.; MARTÍN-CHIVELET, J.; LOPEZ GÓMEZ, J.
Revista:
SEDIMENTARY GEOLOGY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 302 p. 64 - 86
ISSN:
0037-0738
Resumen:
The Vaca Muerta Formation (early Tithonian ? early Valanginian) is a rhythmic succession of marls and limestones, cropping out in the Neuquén Basin, west-central Argentina. This lithostratigraphic unit was traditionally interpreted as basinal to slope deposits. Detailed facies analysis allows to differentiate seven facies associations, representing basinal to middle ramp facies of an homoclinal ramp system prograding westward from the eastern margin, and slope facies attributed to a distally steepened ramp system that prograde eastward from the Andean volcanic arc in the west. Two sequence hierarchies are recognized, five third order depositional sequences , and fifteen fourth order high-frequency sequences. Fluctuations in organic matter content within the Vaca Muerta Formation suggest relationship with depositional sequences, finding the highest values associated with transgressive system tracts. This work represents an important advance in the understanding of the sedimentary and stratigraphic evolution of this exceptional unconventional reservoir. Our sequence stratigraphic approach contributes to the understanding of the relationship between organic matter, facies, and sea-level changes.