| one publication added to basket [24723] | Rare earth element anomalies in the Nankai accretionary prism, Japan
Alexander, J.L. (1998). Rare earth element anomalies in the Nankai accretionary prism, Japan, in: Cramp, A. et al. Geological evolution of ocean basins: results from the Ocean Drilling Program. Geological Society Special Publication, 131: pp. 273-285. https://dx.doi.org/10.1144/GSL.SP.1998.131.01.17
In: Cramp, A. et al. (1998). Geological evolution of ocean basins: Results from the Ocean Drilling Program. Geological Society Special Publication, 131. Geological Society: London. ISBN 1-86239-003-7. XI, 323 pp., more
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719; e-ISSN 2041-4927, more
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| Keywords |
Accretion
Fluids > Drilling fluids
Sediments > Chemical sediments > Hydrothermal deposits
Sediments > Clastics > Turbidites
Japan [Marine Regions]
Marine/Coastal |
| Abstract |
Rare earth element (REE) patterns are often used as provenance indicators, but there is growing evidence that this signal may be distorted by REE mobility. This study focuses on turbiditic and hemipelagic muds from Ocean Drilling Program (ODP) Site 808, drilled in the toe of the Nankai accretionary prism. Most of these muds have a typical shale REE composition, but several samples are enriched in REE. Four of these are associated with hydrothermal deposits, rich in manganese (up to 18% MnO). A further two have minor mineral phases, zircon and florencite, with high REE concentrations. There is also a heavy REE enrichment in one sample from the décollement zone. This has not yet been explained, but it does not appear to have a mineralogical control. |
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