Conferencia a cargo del Profesor Matthew McCarthy (Ocean Sciences Dept. University of California, Santa Cruz).
Presentación: In the past two decades compound-specific isotope analysis of amino acids (CSI-AA) has exploded, moving from a novel analysis performed by a few labs to an increasingly mainstream technique, employed across a steadily increasing range of disciplines from ecology, archaeology, paleoceanography, geomicrobiology, to biogeochemical cycle research. Amino acid stable carbon (d13CAA) and nitrogen (d15NAA) measurements remain the best developed applications, with D/H ratios of AA and position-specific AA isotopes representing the next frontier.
Most work to date has focused on establishing trophic connectivity and baseline isotope values in modern and Anthropocene ecological applications. However, CSI-AA also has enormous potential for paleo studies. A wide range of d15NAA and d13CAA proxies have now been adapted for reconstruction of past N and C cycles, including primary production assemblages, nutrient and export production isotope values. When coupled with appropriate archives, these approaches represent an entirely new suite of paleo-tools, based on the most abundant class of nitrogenous molecules in well preserved organic material, and offering information about specific processes far beyond common bulk stable isotope records.
This talk will present an overview CSI-AA techniques and potential applications, focused primarily on d13CAA and d15NAA applications in paleo-archives, fossils, and microfossils. It will also explore how back into the past it may be possible to apply these approaches, in the face of organic diagenesis and degradation.
- Fecha: Miércoles 14 de diciembre de 2022
- Lugar: Salón de actos del Instituto Andaluz de Ciencias de la Tierra (IACT), Avenida de las Palmeras nº4, Armilla (Granada)
- Horario: 12.30 h
- Organiza: Departamento de Mineralogía y Petrología
- Más información:
Claudio Marchesi
Universidad de Granada
Departamento de Mineralogía y Petrología
Correo: claudio@ugr.es / claudio@iact.ugr-csic.es