Formation particularities of hypergene ferromanganese nodules: Far East Russia and Vietnam

Autor:	V. M. Novikov, V. K. Orleanskii, E. L. Shkol’nik, E. A. Zhegallo
Rok vydání:	2008
Předmět:	Goethite Terrigenous sediment Stratigraphy Ferromanganese nodules Geochemistry Paleontology Mineralogy Geology Authigenic engineering.material Oceanography Feroxyhyte Geophysics Geochemistry and Petrology visual_art engineering visual_art.visual_art_medium Sedimentary rock Lepidocrocite Gibbsite
Zdroj:	Russian Journal of Pacific Geology. 2:422-432
ISSN:	1819-7159 1819-7140
DOI:	10.1134/s1819714008050059
Popis:	Ferromanganese nodules (pisolites) form accumulations in basal layers of Pliocene-Quaternary clayey sections of Far East Russia and Vietnam. They are composed of minerals that are in common for both these regions (authigenic vernadite, feroxyhyte, goethite, halloysite, and terrigenous quartz) and minerals that are characteristic of either the northern (authigenic hollandite, lithiophorite, and bernessite) or southern (authigenic alumophorite, lepidocrocite, ferrihydrite, gibbsite, and terrigenous ilmenite) regions. Pisolites are considered to be microbial colonies with Mn and Fe oxides frequently forming biomorphs. The growth of the colonies was accompanied by dying off and mineralization of microorganisms successively from the central toward the peripheral parts of the nodules. The formation of metalliferous pisolites was linked to the oxidizing geochemical barrier developed at the interface between compact sedimentary clays and the underlying porous readily permeable weathered products of basalts.
Databáze:	OpenAIRE
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