Results 241 to 250 of about 374,391 (286)

An Integrated Calcareous Microfossil Biostratigraphic and Carbon-Isotope Stratigraphic Framework for the La Luna Formation, Western Venezuela

PALAIOS, 2003
Abstract The biostratigraphy of the La Luna Formation has long been in dispute, despite the importance of this unit as the most important source rock for hydrocarbons in Venezuela. In this paper, calcareous microfossil biostratigraphy combined with carbon-isotope stratigraphy provides a stratigraphic framework for the formation, permitting revision of ...
Linda M. DE ROMERO, I. Truskowski, T. Bralower, J. Bergen, O. Odreman, J. Zachos, F. Galea-Alvarez   +6 more
semanticscholar   +2 more sources

Isotope studies of carbonate rocks of La Luna Formation (Venezuela) to constrain the oceanic anoxic event 3 (OAE3)

Journal of South American Earth Sciences, 2016
Abstract 87 Sr/ 86 Sr ratios, δ 13 C, and δ 18 O determinations performed on 30 bulk carbonate rocks are presented to constrain the isotope characteristics regarding Oceanic Anoxic Event 3 in the La Luna Formation, Maracaibo Basin. The samples were collected along a 22 m profile in San Miguel region (Merida State, Venezuela).
M. Machado, F. Chemale, K. Kawashita, O. Rey, C. Moura   +4 more
semanticscholar   +2 more sources

Late Cretaceous Anoxia and Lateral Microfacies Changes in the Tres Esquinas Member, La Luna Formation, Western Venezuela

PALAIOS, 2003
Abstract The Tres Esquinas Member of the La Luna Formation is a glauconite-rich phosphorite unit associated with changes that took place in depositional environments in the Maracaibo Basin at the end of the Late Cretaceous. The unit marks the end of La Luna Formation sedimentary cycle. This paper presents results of petrographic studies of samples from
M. Parra, L. Moscardelli, M. Lorente
semanticscholar   +2 more sources

Geochemical signatures of bedded cherts of the upper La Luna Formation in Táchira State, western Venezuela: Assessing material provenance and paleodepositional setting

Sedimentary Geology, 2017
Here we undertook an inorganic geochemical study of Cenomanian-Campanian bedded cherts (the Tachira Ftanita Member of the La Luna Formation) in the western region of the Tachira State, Venezuela. The aim of this study was to determine the paleo-oceanographic and paleo-environmental conditions that governed the deposition of chert beds and put forward a
G. Garbán, Manuel Martínez, G. Márquez, O. Rey, M. Escobar, N. Esquinas   +5 more
semanticscholar   +2 more sources

A record of long- and short-term environmental and climatic change during OAE3: La Luna Formation, Late Cretaceous (Santonian–early Campanian), Venezuela

Sedimentary Geology, 2004
Abstract The La Luna Formation was deposited under anoxic/dysoxic conditions in a tropical epicontinental sea on the northwest South America margin. Sedimentological, micropaleontological and geochemical evidence provides insights into factors that influenced the sedimentation and controlled the accumulation of organic-rich deposits at decimeter and ...
O. Rey, J. A. Simo, M. Lorente
semanticscholar   +2 more sources

Applications of electron microprobe analysis (EPMA) in the study of Venezuelan source rocks: La Luna and Querecual Formations

Fuel, 2007
Abstract This work presents the electron probe for microanalysis (EPMA) study of Venezuelan source rocks for stylolites (Querecual Formation), framboids (La Luna Formation), and kerogen (La Luna and Querecual Formations). Distributions of major and trace elements were studied to determine the elemental association with inorganic (minerals) and ...
S. Lo Mónaco, L. López, H. Rojas, P. Lugo, D. García, J. Gastiel   +5 more
openaire   +3 more sources

Biostratigraphic, Sedimentologic, and Chemostratigraphic Study of the La Luna Formation (Late Turonian–Campanian) in the San Miguel and Las Hernández Sections, Western Venezuela

PALAIOS, 2003
Abstract Depositional paleoenvironments of the La Luna Formation were established based on investigation of sedimentology, foraminiferal assemblages, and stable isotope composition of two sections in the Venezuelan Andes. Planktonic foraminiferal biostratigraphy indicates that the age of the San Miguel section spans from the late Turonian to the early ...
E. Zapata, V. Padrón, I. Madrid, Vanessa Kertznus, I. Truskowski, M. Lorente   +5 more
semanticscholar   +2 more sources

Effective multi-scale rock characterization using digital rock physics applied to La Luna Formation, Middle Magdalena Valley Basin, Colombia

SEG Technical Program Expanded Abstracts 2013, 2013
La Luna Formation in northern South America is one of the most prolific hydrocarbon source rocks in the world. Recently, La Luna Formation has also gained a significant exploration potential as an unconventional oil/gas target in Colombia. Recent developments in Digital Rock Physics (DRP) technologies allowed us to conduct a multi-scale rock ...
E. Diaz, J. Walls, N. Marfisi, H. Galvis, Maria Cantisan, D. Restrepo   +5 more
semanticscholar   +2 more sources

Exploring La Luna Formation Unconventional Plays in the Maracaibo Lake Basin, Through 3D Modeling Based on Acoustic Seismic Inversion

Proceedings of the 11th Unconventional Resources Technology Conference, 2023
J. Méndez, C. Lobo, Ronny Movil, L. Yegres, C. Alcântara, James Brown   +5 more
semanticscholar   +2 more sources

Upper Cretaceous Enchodontidae (Actinopterygii: Aulopiformes) in the La Luna formation, Eastern Cordillera, Colombia: A new report

Journal of South American Earth Sciences
José Manuel Torres-Parada, Johanset Orihuela León, Germán David Patarroyo Camargo, C. M. Alarcón Gómez, Jefferson Steeven Diaz Villamizar, Juan Sebastián Gómez-Coronado, José Javier Márquez Prada   +6 more
semanticscholar   +2 more sources