Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs
نویسندگان
چکیده
1 Department of Earth Sciences, ETH Zurich, Zurich, Switzerland, 2 Department of Biological, Geological and Environmental Sciences, Bologna University, Bologna, Italy, 3 Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA, 4 Comité Espeleológico de Matanzas, Sociedad Espeleológica de Cuba, Matanzas, Cuba, 5 Associazione di Esplorazioni Geografiche la Venta, Treviso, Italy
منابع مشابه
Isotopic fingerprints of microbial respiration in aragonite from Bahamian stromatolites
Authigenic aragonite preserves a carbon isotopic record of heterotrophic microbial influences on dissolved inorganic carbon (DIC) in microenvironments within shallow subtidal stromatolites from Highborne Cay, Bahamas. A greater amount of aragonite precipitates when and where respiration, rather than photosynthesis, influences local DIC, which is consistent with sulfate reduction promoting carbo...
متن کاملComposition and structure of microbial communities from stromatolites of Hamelin Pool in Shark Bay, Western Australia.
Stromatolites, organosedimentary structures formed by microbial activity, are found throughout the geological record and are important markers of biological history. More conspicuous in the past, stromatolites occur today in a few shallow marine environments, including Hamelin Pool in Shark Bay, Western Australia. Hamelin Pool stromatolites often have been considered contemporary analogs to anc...
متن کاملA Proposal for Formation of Archaean Stromatolites before the Advent of Oxygenic Photosynthesis
Stromatolites are solid, laminar structures of biological origin. Living examples are sparsely distributed and formed by cyanobacteria, which are oxygenic phototrophs. However, stromatolites were abundant between 3.4 and 2.4 Gyr, prior to the advent of cyanobacteria and oxygenic photosynthesis. Here I propose that many Archaean stromatolites were seeded at points of efflux of hydrogen sulfide f...
متن کاملStromatolites of the Lower Cambrian Deep Spring Formation; Mount Dunfee, Esmeralda County, Nevada
The Middle Member of the Lower Cambrian Deep Spring Formation at Mount Dunfee, Nevada contains a diverse assemblage of stromatolites that formed on a tideand storm-dominated, siliciclastic-influenced, carbonate shelf. The stromatolites formed in a shallow subtidal environment within and near active oolite shoals under strongly focused currents. The stromatolites occur in four different lithofac...
متن کاملEvaluation of 226Ra, 232Th, 137Cs and 40K “Agaricus Bisporus” Activity in Cultivated Edible Mushroom formed in Tehran Province- Iran
Introduction Natural and man made radioactive sources exist in our environment they can enter into our food chains. One of these is the soil-mushroom-human chain. High level doses of natural radiation can cause hazards to humans. Materials and Methods Samples of Agaricus bisporus cultivated edible mushroom in Tehran province- Iran were collected from 7 farms. Specific activity of 226Ra, 228Ra, ...
متن کامل