Department of Stratigraphy and Palaeontology, Facultad de Ciencias, S/N, 18003, University of Granada, Granada, Spain - Escuela de Doctorado de Ciencias, Tecnologías e Ingenierías University of Granada
I am a committed and versatile
professional, with a special interest
and experience in stratigraphy and
basin analysis through correlation
and integration of various tools: sedimentology and ichnology
Campanian-Maastrichtian evolution of sedimentary systems during the final stages of an epeiric sea —La Luna Sea— in eastern Colombia: Processes, spatio-temporal variability, and depositional controls Carlos A. Giraldo-Villegas, F. J. Rodríguez-Tovar, Sergio A. Celis, A. Pardo-Trujillo Marine and Petroleum Geology, 2025 Epeiric seas were widespread during the Cretaceous, associated with global sea-level rise. Their stratigraphic record , controlled mainly by eustasy , tectonic and climatic factors , resulted in the accumulation of important hydrocarbon source and reservoir rocks. In the NW of South America-Colombia, an epeiric sea established in the Early Cretaceous—knows as La Luna Sea in the Late Cretaceous—, bounded by a volcanic arc to the western side and by the Amazonian Craton to the east, was progressively filled during the Campanian-Maastrichtian, being these latest Cretaceous deposits important hydrocarbon reservoirs for conventional petroleum systems . In the Campanian-early Maastrichtian period the western side and the central part of the basin had a normal shoreface profile, dominated by pelagic and wave sedimentation processes, while a delta profile dominated by fluvial processes characterized the eastern side. During the late Maastrichtian, directly related to the accretion of western Caribbean terranes , transitional and continental environments dominated by fluvial processes were established on both sides of the basin, suggesting changes in geomorphological-topographic and drainage system characteristics of the emerged areas, leading to the filling of the epeiric basin. The distribution of the deposits was controlled by allogenic processes: tectonism associated with the growth of the proto-Central Cordillera, the global eustatic level, and in minor degree by autogenic processes such as channel avulsion, bottom and longshore currents, and high productivity events. These processes and their variable temporal and spatial influence were responsible for the different types of deposits on either side of the basin, which had a direct impact on the establishment of macrobenthic communities, also providing new exploration ideas related to the reservoirs. Comparisons suggest that the size of the receiving and emerged zones plays an important role in the distribution and arrangement of deposits along and across the basin, related to the nature of the internal processes involved in sediment redistribution.
Miocene vanishing of the Central American Seaway between the Panamá Arc and the South American Plate Felipe Vallejo-Hincapié, Andrés Pardo-Trujillo, Ángel Barbosa-Espitia, Daniela Aguirre, Sergio A. Celis, Carlos A. Giraldo-Villegas, Ángelo Plata-Torres, Raúl Trejos-Tamayo, Andrés Salazar-Ríos, José-Abel Flores, Marie-Pierre Aubry, Fabián Gallego, Eduardo Delgado, David Foster Bulletin of the Geological Society of America, 2024 A controversy has developed in recent years regarding the timing of the closure of the Central American Seaway. This tectonic event significantly impacted oceanic circulation between the tropical Pacific and Atlantic oceans and resulted in the formation of a land bridge connecting the South and North American continents. The long-held view of a Pliocene age (ca. 3 Ma) for the closure of the Central American Seaway has been challenged by the proposal that the Panamá Arc collided with South America during the Middle Miocene (15–13 Ma) as a deep oceanic gap between them closed along the Uramita suture zone. However, direct geologic evidence from this suture zone to support either interpretation has been lacking. Here, we report on a comprehensive study of three stratigraphic transects across the Uramita suture zone, using a host of methodologies including sedimentological, ichnological, micropaleontological, U-Pb detrital geochronological, and provenance analyses. Our data reveal that lower offshore to slope conditions prevailed in the Central American Seaway along the suture zone during the latest Early to earliest Middle Miocene (16.4–15.1 Ma) and that oceanic conditions there ceased to exist between the Middle and Late Miocene. These results agree with the Middle Miocene age proposed for the Central American Seaway closure along the tectonic boundary. However, other deeper portions of the Central American Seaway persisted in western Colombia, which challenges the notion of a Central American Seaway confined to the suture zone between the Panamá Arc and South American Plate during the Middle Miocene.
Ichnological indicators of physico-chemical stresses in wave- to tide-dominated Miocene shallow marine environments (Argentine Patagonia) Sergio A. Celis, Damián Moyano-Paz, Sebastián Richiano, José I. Cuitiño, Francisco J. Rodríguez-Tovar Sedimentary Geology, 2024 An integrated analysis of ichnological and sedimentological features in ancient successions provides a robust dataset of high-resolution interpretations of environmental parameters, encompassing both depositional and ecological aspects. By characterising discrete and recurring bioturbation patterns in the Puerto Madryn Formation (Late Miocene, Argentine Patagonia), we arrive at key knowledge about predominant environmental stresses within transgressive phase shallow marine and estuarine systems, shedding light on their palaeoenvironmental implications. Given the inherent complexities of coastal settings, including the challenges posed by omission/erosion surfaces, it becomes imperative to consider the intricate interplay of multiple depositional processes and environmental factors. Through a detailed integration of sedimentological and ichnological approaches, we discern the establishment of a wave-dominated system overlain by a tide-dominated estuarine system. The wave-dominated marine system involves tabular bodies extending laterally over tens of kilometres, with upward fining and coarsening successions from the mid- to lower-shoreface to offshore-shelf environments. The influence of waves and tides on these systems is discussed in the absence of physical sedimentary structures and the need to find elements that bring us closer to elucidating whether waves or tidal processes influence shoreface to offshore systems. The ichnological assemblages allow for the characterisation of Cruziana ichnofacies with proximal ( Taenidium and Thalassinoides ), archetypal ( Asterosoma , Chondrites , Cylindrichnus , Ophiomorpha , ? Rhizocorallium , Rosselia , Scolicia , Sinusichnus , Siphonichnus , Teichichnus , and Thalassinoides ), and distal expressions ( Chondrites , Helicodromites , Phycodes , Thalassinoides , and ? Zoophycos ) in the lower shoreface to lower offshore and transitional settings with the shelf. However, the transition from these deposits to Chondrites -dominated beds associated with lower offshore to shelf environments—determined by changes in oxygenation, nutrients, and energy conditions—impedes assignment of all the successions to a particular ichnofacies. The tide-dominated estuarine system features wide, channel-shaped bodies filled with sandy to heterolithic facies, interpreted as intertidal and subtidal deposits. To differentiate between estuary mouths and other settings, the analysis involved characterisation of transgressive and regressive surfaces, ichnological assemblages, and facies distribution, determining net sediment movement—whether landwards or seawards—and its influence on system classification. The ichnological assemblages could be assigned to the Skolithos ( Arenicolites , Gyrolithes , Maiakarichnus , Ophiomorpha , Schaubcylindrichnus , Skolithos , and Thalassinoides ) and Cruziana ichnofacies ( Ophiomorpha , Rosselia , Scolicia , and Siphonichnus ). Variations in diversity and abundance often help to determine certain stressful conditions, although the transition to more open areas is discussed, addressing how it could modify the typical models linked with a direct relationship between abundance/diversity and physico-chemical stress. • Ichnological analysis as indicators of physico-chemical stresses • Ecosystem evolution from wave-dominated to tide-dominated environments • Non-tidal shorefaces in transgressive phase • Tide-dominated estuarine system in regressive phase • Physico-chemical stressors challenge traditional ichnofacies analysis.
Coarse-grained submarine channels: from confined to unconfined flows in the Colombian Caribbean (late Eocene) Sergio A. Celis, Fernando García-García, Francisco J. Rodríguez-Tovar, Carlos A. Giraldo-Villegas, Andrés Pardo-Trujillo Sedimentary Geology, 2024 Submarine channel mouth settings are hardly preserved in the stratigraphic record. Although they are still poorly known with respect to other segments of turbidite systems, conceptual models are being refined in the light of new discoveries in modern and ancient examples. Still, some questions such as the transition between expansion zones and traditional Channel-Lobe Transition Zone (CLTZ) remain open in ancient systems. Upper Eocene deposits of the Colombian Caribbean (San Jacinto Fold Belt) are interpreted here as a fan-delta-fed, submarine, coarse-grained channel-lobe system. It displays a well-preserved channel inception stage represented by sigmoidal to lens-shaped gravels, and foreset and backset planar cross-stratified pebbly sandstones interpreted as an expansion zone. In a later stage, a classical channel-levee complex was developed, represented by channel fill elements showing sharp- and erosional-based, fining-upward sequences that are meters thick, having basal massive matrix-supported pebble (hard —extrabasinal— clasts, rip-up clasts, coastal bioclasts) conglomerates, vertically evolving to liquefied massive to planar-laminated coarse-grained sandstones with phytodetrital carbonaceous laminae. They are interpreted as concentrated flow deposits (high-density turbidites) coming from continental areas or from coastal systems (i.e., delta reworking). Undifferentiated channel belt thin-bedded turbidites associated with levees and terraces deposits are related to these confined systems. The channel-lobe transition zone is characterized by debrites from cohesionless debris flow in a channel-mouth bar setting, representing bypass processes that developed distally into low-angle, planar cross- and undulated-stratified (upstream antidune) pebble-size to coarse-grained sandstones that fill low-angle scours (cut-and-fill structures) in an antidune field setting with supercritical conditions. When the currents lose channel confinement, is characterized by changes from Froude supercritical to subcritical flow conditions in an inner lobe to lobe off-axis environment. Large seasonal fluctuations in precipitation favor high sediment concentrations, promoting the formation of volumetrically significant fan deltas and coarse-grained submarine channels with high erosive capacity; therefore, their record helps refine interpretations of depositional processes, providing criteria for recognizing areas of the turbiditic systems that are difficult to preserve. The particular aggradational conditions for the preservation and stratigraphic characterization of the rare exhumed submarine channel mouth systems make it possible to decipher sediment dispersal patterns and thus connect the models proposed here from supercritical systems to the traditional models of turbiditic systems.
Deciphering influencing processes in a tropical delta system (middle-late Eocene? to Early Miocene, Colombian Caribbean): Signals from a well-core integrative sedimentological, ichnological, and micropaleontological analysis Sergio A. Celis, Francisco J. Rodríguez-Tovar, Andrés Pardo-Trujillo, Fernando García-García, Carlos A. Giraldo-Villegas, Fabián Gallego, Ángelo Plata, Raúl Trejos-Tamayo, Felipe Vallejo-Hincapié, Francisco Javier Cardona Journal of South American Earth Sciences, 2023 Deltaic depositional systems are characterized by a complex interaction of physical, chemical, and biological factors. Although fluvial-, wave- and tidal-dominated deltaic environments have been extensively studied, evaluation of the processes in tropical mixed sedimentary systems has not been fully documented. Tropical regions with active margins are tectonic environments where these multiple factors act on the development of coastal systems. An onshore well-core from this tropical setting (Sinú-San Jacinto Basin, Colombian Caribbean) revealed that a middle-upper Eocene?-lower Oligocene coarse-grained deltaic setting is replaced by a thick coal-bearing mixed-energy fine-grained deltaic succession from the Oligocene to Early Miocene. The integrated analysis of facies associations, ichnological data, and terrestrial/marine micropaleontological assemblages (palynomorphs, foraminifera, and calcareous nannofossils) of this well-core allowed us to identify changes in dominance and influence of coastal processes (fluvial-, wave- and tide) and shoreline evolution. Using this information, as well as the sediment supply and accommodation space ratio, we were able to distinguish three intervals from the bottom to the top of the siliciclastic succession: (i) middle-late Eocene?–early Oligocene, prograding, fluvial-dominated, wave- and tide-influenced coarse-grained deltas with amalgamation of hyperpycnal-dominated mouth bars with hyperconcentrated flow input, (ii) Oligocene, retrograding to prograding, hyperpycnal-dominated heterolithic delta deposits punctuated by transgressive pulses, and (iii) late Oligocene to Early Miocene, aggradational, coal-bearing fine-grained delta plain with a higher proportion of transgressive phases over the continental environment. The complete succession represents long-term (∼14 Myr) mixed-energy nearshore siliciclastic systems, showing different lithological arrangements and sedimentation styles. A long-term evolution is observed from a middle-late Eocene? steep, short and coarse-grained sedimentary system with tropical humid lowland forest and punctual development of macrobenthic tracemaker communities (Interval I) to an Early Miocene gently (poorly drained), well-developed delta plain with mangroves and wave- and storm-influence record through trace fossils assemblages (Interval III). A combination of factors, including subsidence, relief uplifting, and possible relative sea level changes, are interpreted as the main controls on the stratigraphic evolution of sedimentary styles throughout the entire succession. Minor-order sedimentary successions into each interval (e.g., prograding distributary mouth-bar channel) revealed short-term cycles presumably controlled by an internal delta dynamic. Multidisciplinary analysis is essential for recognizing the influence of fluvial, wave, and tidal processes on tropical deltas, where high spatial and temporal variability makes it difficult to determine dominant processes for long periods of time.