RT Journal Article
T1 Modelo de desarrollo y formación de concreciones carbonáticas en los sedimentos lutíticos anóxicos (Coniaciense-Campaniense), de la Formación La Luna en Venezuela Occidental
T1 Model of development and formation of carbonate concretions in the Coniacian-Campanian anoxic shalesediments of the La Luna Formation in Western Venezuela
A1 Zapata, Eglee
A1 Soto González, Gilberto
A1 Kertznus, V.
AB The carbonate concretions that characterize the anoxic-dysoxic calcareous shales deposits of Late CretaceousLa Luna Formation in Western Venezuela, represent a non-conventional model of growth and developmentof carbonate concretions. Its evolutionary pattern is closer to that of the geodes. A hard outer layer conein cone cement protects the nucleus consisting of friable and humid carbonate mud associated withfenestral structures composed of Mg-calcite and framboidal pyrite. The migration of fluids determines thecharacteristics of the textural facies as well as their typical internally laminated structure. The size andshape of the concretions vary within the stratigraphic sequence, following a pattern that seemed to belinked to the oxygen variation in the basin. The evaluation and the modelling proposed respond to asystematic and detailed petrographic evaluation (SEM-BSEM) and isotopic analyses (oxygen and carbonisotopes)
PB Sociedad Geológica de España
YR 2005
FD 2005
LK http://hdl.handle.net/10272/8674
UL http://hdl.handle.net/10272/8674
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026