1) Investigación >
Artículos Publicados >

Por favor, use este identificador para citar o enlazar este ítem:

Título : Geochemistry of the Mirador Formation (Late Eocene-Early Oligocene), southwestern Venezuela: Chemostratigraphic constraints on provenance and the influence of the sea level
Autor : Reategui, Katya
martines, manuel
estéves, Ivan
Gutierrez, Jose vicente
Martínez, Alejandro
Urbani, Franco
Palabras clave : chemostratigraphy
Fecha de publicación : 13-May-2014
Citación : Geochemical Journal;39
Resumen : A geochemical study was carried out on Eocene-Lower Oligocene sedimentary rocks (the Mirador Formation) from the southern Lake Maracaibo Basin, western Venezuela. The goal of this work was the identification of source rock composition and tectonic settings of source areas, and their temporal changes. The geochemistry was also used to investigate attributes of the paleoenvironment. Eighty-nine rock samples were collected and the bulk inorganic geochemistry (Al2O3, SiO2, TiO2, Fe2O3, MnO, CaO, MgO, K2O, Li, B, Sc, V, Cr, Ni, Zn, Rb, Y, Mo, La, Ce and Th) was determined by ICP-AES; total sulfur was determined in a LECO SC-432 analyzer. Multivariate statistical tools were employed to evaluate the correlation between the different variables. Through cluster-constrained analysis, four subdivisions, or main chemofacies, were defined and correlated with the significant lithologic units. The tectonic setting for the source rock could be a passive margin, and a mixed source was inferred, consisting of recycled sedimentary rocks and igneous and/or meta-igneous rocks of predominantly felsic composition. The most marine-influenced lithological units occur at the bottom of the section.
ISSN : 1880-5973
Aparece en las colecciones: Artículos Publicados

Ficheros en este ítem:

Fichero Descripción Tamaño Formato
formacion mirador quimioestratigrafia.pdf718.06 kBAdobe PDFVisualizar/Abrir

Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2008 MIT and Hewlett-Packard - Comentarios