INVESTIGADORES
CUADRADO Diana Graciela
congresos y reuniones científicas
Título:
Epibenthic microbial mats colonize gravel in modern and fossil siliciclastic coastal settings.
Autor/es:
PAN, JERÓNIMO; MAISANO, LUCIA; CUADRADO, DIANA G.; NOFFKE, NORA
Lugar:
Puerto Madryn
Reunión:
Congreso; XXI Congreso Geológico Argentino; 2022
Institución organizadora:
Asociación Argentina de Geología
Resumen:
Biosedimentary, laminated microbial consortia known as epibenthic microbial mats colonize sedimentarysurfaces while altering their physical characteristics. In modern siliciclastic settings they aremostly associated with sandy sediments. This contribution reports modern microbial mats colonizing gravelsubstrates (Fig. 1A).The Bahía San Blas coastline (southern Buenos Aires province, northern Patagonia, Argentina) wassubject to frequent storms that create high-energy hydrological processes (Espinosa and Isla 2011), largelyresponsible for gravel transport and deposition known as Rodados Patagónicos. At the study site of PasoSeco (40º38'27"S, 62º12'55"W), a former tidal channel, there exists a depositional mosaic consisting of UpperQuaternary beach gravel deposits of Upper Pleistocene and Holocene ages (Trebino 1987). These gravels arecharacteristically rounded, with pebbles and cobbles as the dominant size fractions (Martinez et al. 2009).Their roundness, one of the salient features arises from high-energy transport. The objectives of this workare: (1) to describe how biofi lms and cyanobacterial biomass incorporates sedimentary particles throughprocesses such as baffl ing, trapping and binding leading to the development of epibenthic microbial mats ongravel; (2) to relate microbial mat accretionary growth and biostabilization with hydrodynamic conditions atthe study site; and (3) to establish morphological comparisons of modern microbially induced sedimentarystructures (MISS) with fossil analogues.