El Sistema Petrolero Cretácio de la Cuenca del Marañon-Perú

A mid-latitude Maastrichtian palynological record from the Yacoraite Formation (Salta Group), northwestern Argentina

“…The Salta Basin in northwestern Argentina is relevant for its wide extent, and hydrocarbon production (Turic et al, 1987;Marquillas and Salfity, 1988;Gómez Omil et al, 1989;Salfity and Marquillas, 1994). The basin fill corresponds to the Salta Group (Turner, 19589) deposited from the Early Cretaceous up to the Eocene and composed of three main units from base to top: Pirgua (Reyes and Salfity, 1973), Balbuena and Santa Bárbara subgroups (Moreno, 1970).…”

“…Despite having been the subject of diverse reviews (e.g., Castaños et al, 1975;Marquillas, 1985;Gómez Omil et al, 1989;Salfity and Marquillas, 1994;, isotopic studies of this rock unit are still scarce (Matthews et al, 1996;Sial et al, 2001;Marquillas et al, 2007). An absolute U-Pb zircon dating has confirmed a Maastrichtian age for at least part of the unit, with a result of 71.9 ± 0.4 Ma and 68.4 ± 0.7 Ma from two tuff layers obtained from the Amblayo and Alemanía members of the Yacoraite Formation (Marquillas et al, 2011).…”

Tectonic controls on the evolution of the Andean Cenozoic foreland basin: Evidence from fluvial system variations in the Payogastilla Group, in the Calchaquí, Tonco and Amblayo Valleys, NW Argentina

“…2) is composed of claystones and siltstones, and is always reddish-brown to red. Gómez Gomez Omil et al (1989) identified three units in the Lumbrera Formation based on the contrasting characteristics of the facies groups: the lower Lumbrera Member, the Faja Verde, and the upper Lumbrera Member. The lower part is very fossil-rich (Pascual et al, 1981;Bond and Lopez, 1993;Gasparini et al, 1993;Babot et al, 2002) and was dated as lower-middle Eocene based on vertebrate associations (Pascual, 1980).…”

The role of inversion tectonics in the structure of the Cordillera Oriental (NW Argentinean Andes)

“…The stratigraphic sequence of this Group is well known in NW Argentina and comprises three units that are, from bottom to top (Fig. 2): the Pirgua Subgroup, the Balbuena Subgroup and the Santa Ba ´rbara Subgroup (Moreno, 1970; Reyes and Salfity, 1973;Salfity and Marquillas, 1981;Gomez Omil et al, 1989).…”