Nature of co-bearing ferromanganese crusts of the Magellan Seamounts (Pacific Ocean); Communication 1, Geology, mineralogy, and geochemistry

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doi: 10.1134/S0024490213060072
Author(s): Novikov, G. V.; Mel'nikov, M. E.; Bogdanova, O. Yu.; Vikent'ev, I. V.
Author Affiliation(s): Primary:
Russian Academy of Sciences, Shirshov Institute of Oceanology, Moscow, Russian Federation
Yuzhmorgeologiya, Russian Federation
Volume Title: Lithology and Mineral Resources
Source: Lithology and Mineral Resources, 49(1), p.1-22. Publisher: MAIK Nauka/Interperiodica Publishing, Birmingham, AL, United States. ISSN: 0024-4902 CODEN: LTMRAR
Note: In English. 38 refs.; illus., incl. 5 tables, sketch map
Summary: Communication 1 of the present paper is devoted to various aspects of the hydrogenic ferromanganese crusts in the western and eastern clusters of the Magellan Seamounts in the Pacific. It was revealed that crusts are developed on guyots as a continuous sheet of Fe-Mn minerals on exposures of primary rocks. They commonly make up ring-shaped deposits along the periphery of the summit surface and in the upper sectors of slopes. Thickness of the crust varies from n to ∼18 cm and shows irregular variations in separate layers. Irrespective of the geographic position, crusts are composed of four layers-two lower phosphatized (I-1 and I-2) and two upper nonphosphatized (II and III) layers. The crusts differ in terms of structure and texture, but they are sufficiently similar within separate layers (I-1, I-2, and others). The major ore minerals in crusts are commonly represented by poorly crystallized and low-ordered minerals (Fe-vernadite and Mn-feroxyhyte); the subordinate mineral, by the well-crystallized and ordered vernadite. It has been established that heavy and rare metal cations are concentrated extremely irregularly in ore minerals of the crusts, suggesting a pulsating mode of their input during different geological epochs. Copyright 2014 Pleiades Publishing, Inc.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Chemical composition; East Pacific; Electron microscopy data; Escanaba Trough; Feroxyhyte; Ferromanganese composition; Ferromanganese crusts; Leg 169; Magellan Seamounts; Mineral composition; North Pacific; Northeast Pacific; Northwest Pacific; ODP Site 1037; Ocean Drilling Program; Ocean floors; Oxides; Pacific Ocean; Phosphatization; Seamounts; Textures; Thickness; Trace metals; Vernadite; West Pacific
Coordinates: N405718 N405718 W1273054 W1273054
N120000 N180000 E1620000 E1500000
Record ID: 2014046463
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany