IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
BIOEROSION ON SPINICAUDATA SHELLS FROM A TRIASSIC FRESHWATER PALEOLAKE, MENDOZA, ARGENTINA
Autor/es:
EVELYN LUZ BUSTOS ESCALONA; EVELYN LUZ BUSTOS ESCALONA; CECILIA BENAVENTE; CECILIA BENAVENTE; ADRIANA CECILIA MANCUSO; ADRIANA CECILIA MANCUSO
Revista:
PALAIOS
Editorial:
SEPM-SOC SEDIMENTARY GEOLOGY
Referencias:
Lugar: Lawrence; Año: 2019 vol. 34 p. 616 - 630
ISSN:
0883-1351
Resumen:
Bioerosion by microorganisms is referred as microbioerosion. In aquatic systems, microbioerosion affects various substrates, most commonly relatively soluble ones such as sulfates, phosphates, and carbonates. However, the record of microbioerosion in fossil calcareous organisms in lake environments is limited. In the North of Mendoza Province, at the locality Paramillos de Uspallata, Triassic sedimentary rocks outcrop. The Agua de la Zorra Formation is characterized by deposition in a deltaic and lacustrine system. This study assesses possible bioerosion by microorganisms on spinicaudata shells from the lacustrine sequence and discusses their preservation potential in lacustrine environments. Spinicaudatans from the Agua de la Zorra Fm were analyzed under a binocular microscope glass and via scanning electron microscopy. Traces, the product of microbioerosion, preserved as moulds, were assigned as Type 1 and 2. The traces were compared with those generated by cyanobacteria, bacteria, chlorophyte, and fungi that inhabit fresh and brackish water environments. Microbioerosion occurs post-mortem state and enhances dissolution of the spinicaudata shells. This, together with bias in extraction methodologies and sampling, is considered us the reason for the rarity of spinicaudatans with traces of bioerosion in the lacustrine record.