Abstract

In this work, we prepared and measured some stromatolite carbonate samples, from Salgada Lagoon, Rio de Janeiro, Brazil. Stromatolites are bio-sedimentary, laminated, carbonate structures produced by sedimentary, chemical and biological processes related to the development and growth of microbial benthic communities, mainly dominated by blue algae and cyanobacteria. These structures are present in the geological record in rocks older than 3.0 billion years and have been used to study the origin of primitive life and variations in past environmental conditions. Detailed AMS measurements were performed at PRIME Lab (Purdue Rare Isotope Measurement Laboratory, Purdue University, IN, USA).

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