RT Journal Article
T1 Outcrop and core integrative ichnofabric analysis of Miocene sediments from Lepe, Huelva (SW Spain): Improving depositional and paleoenvironmental interpretations
A1 Dorador, Javier
A1 Santos, Ana
A1 Mayoral Alfaro, Eduardo
A1 Rodríguez Tovar, F. J.
K1 Paleontología
K1 Paleoicnología
AB Ichnofabric analysis was conducted in Miocene sediments from Lepe (Huelva, SWSpain) based on integrative outcrop and core research, to improve interpretations of depositional and paleoenvironmental conditions, with special attention to sequence stratigraphy. Seven intervals were differentiated in outcrops based on stratigraphic and ichnological features, consisting of two ichnofabrics: Ophiomorpha-Thalassinoides-Spongeliomorpha ichnofabric characterizes intervals 1, 2, 6, 7 and 8, while Palaeophycus-Planolites-Phycosiphon ichnofabric characterizes intervals 3, 4 and 5. Fourteen ichnofabrics were differentiated in core, mainly in view of lithological features, including ferruginous material, grain size, mottled background, ichnotaxa, and Bioturbation Index. A comparison between outcrop and core ichnofabrics through the upper 13.5 m, corresponding to the uppermost Tortonian-lowermost Messinian interval, revealed certain similarities as well as some differences. A continuous siliciclastic deposition with punctual variations in the sedimentation rate can be interpreted that, associated with favorable paleoenvironmental parameters such as aerobic conditions and nutrient availability, allow the maintenance of a well-developed and diverse macroinvertebrate trace maker community. Softgrounds are dominant, but punctually loosegrounds and even firmgrounds could develop. The ichnofabric distribution shows long-scale patterns in outcrop and core, and short-scale patterns exclusively in core. Long-scale patterns reflect the last phases of a transgressive system tract, with a “maximum flooding zone” at the end, and then a highstand normal regression. High-frequency, short-scale, repetitive patterns in ichnofabrics from core, mainly between ichnofabrics 6 and 8 (below) and 9 (above), can be linked to “local flooding surfaces”, subdividing the “maximum flooding zone” into parasequences.
PB Elsevier
SN 0037-0738
SN 1879-0968 (electrónico)
YR 2017
FD 2017-03-18
LK https://hdl.handle.net/10272/24837
UL https://hdl.handle.net/10272/24837
LA eng
NO Francisco J. Rodríguez-Tovar, Javier Dorador, Eduardo Mayoral, Ana Santos, Outcrop and core integrative ichnofabric analysis of Miocene sediments from Lepe, Huelva (SW Spain): Improving depositional and paleoenvironmental interpretations, Sedimentary Geology, Volume 349, 2017, Pages 62-78, ISSN 0037-0738, https://doi.org/10.1016/j.sedgeo.2017.01.001.
NO Funding for this research was provided by Project CGL2015-66835-P (Secretaría de Estado de I + D + I, Spain), and Research Groups RNM-178 and RNM-276 (Junta de Andalucía). The research of JD was financed with a pre-doctoral grant supported by the University of Granada.
DS Repositorio Institucional de la Universidad de Huelva
RD 29 may 2026