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- W2000510849 abstract "Manganese micronodules from various environments were analyzed with the electron microprobe. Chemical characteristics of marine manganese nodules were examined in relation with their depositional environments and compared with those of manganese macronodules. The compositional variation has a connection with accumulation rates and chemical features of the associated sediments. Mg and Ti tend to be enriched in micronodules relative to the host sediments; these elements may produce authigenic mineral phases in micronodules. These observations show that manganese micronodules are chemically formed under approximately the same condition as that for macronodules, but coexisting pairs of micronodules and macronodules collected from the same sediments suggest that oxic diagenesis plays a more important role in the formation of micronodules than that of macronodules. The chemical features of manganese micronodules collected from several marine environments such as a marginal sea, hemipelagic regions, and the central Pacific show that their compositions have a close relation to their depositional environments. Micronodules of hydrothermal origin show chemical characteristics different from those of hydrogenous and diagenetic nodules. We propose several criteria for the discrimination of micronodules of various types. Examination of DSDP cores indicates that micronodules disperse abundantly in marine sediments and their chemical composition remains unchanged through a long span of geological time. Furthermore, preliminary assessment of sedimentary rocks on land shows the preservation of ancient micronodules. Thus, manganese micronodules are a useful indicator of the depositional environment of sediments, and ancient micronodules from sedimentary rocks may offer a possible key to the origin of sedimentary rocks and to the history of geological terranes." @default.
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- W2000510849 date "1987-07-01" @default.
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- W2000510849 title "Compositional Variations in Manganese Micronodules: A Possible Indicator of Sedimentary Environments" @default.
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- W2000510849 doi "https://doi.org/10.1086/629142" @default.
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