Influence of global,regional, and local factors on the genesis of the Jurassic manganese ore formation in the Transdanubian Range,Hungary |
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| Institution: | 1. IGMP Faculty of Geology, University of Warsaw, al. ?wirki i Wigury 93, 02-089 Warsaw, Poland;2. Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK;3. School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3 JW, UK;1. Department of Earth Sciences, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada;2. Geological Surveys Branch, New Brunswick Department of Energy and Mines, P.O. Box 50, Bathurst, New Brunswick E2A 3Z1, Canada;1. Department of Earth Sciences, Faculty of Science, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan;2. Division of Earth Sciences, Department of Environmental Changes, Faculty of Social and Cultural Studies, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan |
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| Abstract: | Economically important black shale-hosted manganese carbonate deposits occur in certain parts of the Transdanubian Range in Hungary. These ore deposits were formed in a short interval coinciding with the Early Toarcian global anoxic and mass extinction event that was associated with drastic perturbations of the oceanographic conditions. During the Early Jurassic the Transdanubian Range Unit was located between two ocean basins. Simultaneous opening of these two basins created an extensional regime resulting in a complex topography with tectonically-controlled small scale basins above an attenuated continental lithosphere. Sluggish circulation led to the development of layered water masses in certain parts of these basins, with oxygenated upper and oxygen-depleted lower reservoirs. This paleogeographic and paleoenvironmental setting favoured the microbially-mediated accumulation of manganese and iron. |
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