RT Journal Article
T1 Identificación de Tractos Sedimentarios en sedimentos pelágicos mediante métodos geoquímicos. Formación La Luna, Occidente de Venezuela
T1 Identification of Systems Tracts in Pelagic Sediments by Geochemical Methods. La Luna Formation, WesternVenezuela
A1 Soto González, Gilberto
A1 Zapata, Eglee
A1 Kertznus, V.
AB An integrated study of the geochemistry, sedimentology and biostratigraphy of two outcrop sections of theLa Luna Formation in Western Venezuela was carried out to determine the eustatic changes that influencedthe deposition and preservation of anoxic sediments in the Late Cretaceous.Five (5) depositional sequences within the La Luna Formation were identified in the studied outcropsections (Las Hernández and San Miguel) by shifts in 13C stable isotopes, as well as in CaCO3, Si, and Tielemental content (normalized to Al).Transgressive system tracts (TST) are characterized by heavier values in 13C isotopes, lower CaCO3, andhigher content of TOC. During these periods the values of Si/Al and Ti/Al show an increasing trend andreach their highest peaks at the maximum flooding surfaces (MFS). Highstand system tracts (HST) arecharacterized by high contents of CaCO3, and a shift towards lighter values of 13C isotopes. The sequenceboundaries (SB) are evidenced by a rapid shift in the 13C isotopes (from lighter to heavier values) and bythe geochemical contrast between the HST and the TST.The identified systems tracts (Turonian-Campanian), clearly correspond with the Haq et al (1988) globalsea-level change curve
PB Sociedad Geológica de España
YR 2005
FD 2005
LK http://hdl.handle.net/10272/8667
UL http://hdl.handle.net/10272/8667
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026