Structural position of the magellan mountains (Pacific Ocean) ironmanganese mineralization according to morphotectonic and cosmogeological data

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The use of morphostructural analysis and cosmogeological decoding methods by the working with the underwater Magellan Mountains relief visualized digital models made it possible to identify the spatial and hierarchical organization of ring anomalies and lineaments, correlated, respectively, with focal structures and fault zones of different ranks. According to complex investigations results and available regional geological materials, the decisive importance in the formation and development of the concerned mountain system attaches to the phenomena of mantle diapirism and basaltoid volcanism, which were realized discretely in time during the Cretaceous – Middle Miocene chronological period. The large (radius about 270 km) focal system which are correlated with the underlitospheric mantle diapir projection and expressed in the relief as relict magmatic swell had played the main role in Fe, Mn, Co mineralization distribution within the Magellan Mountains investigated district. The ore mineralization formation was going on differentially in time and space over a time long period starting from the Late Cretaceous (Campanian-Maasticht), against the background of a constantly renewed concentration of Fe, Mn, Co metals in the bottom layers of the water column due to hydrotherms and galmyrolysis phenomena. The radial-concentric distribution of ore mineralization is typical for the relict swell uplift, for individual paleovolcanic structures and their groupings correlated with large guyots. The obtained data served as the basis of forecast criterions for this mineralization type.

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A. Gavrilov

V.I. Il’ichev Pacific Oceanological Institute FEB RAS

编辑信件的主要联系方式.
Email: gavrilov@poi.dvo.ru
俄罗斯联邦, Vladivostok

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2. Fig. 1. Bathymetric map (scale 1:5000 000) of the guyot chain and other paleovolcanic submarine rises of the Magellan Seamounts. Isobats are drawn every 1000 m (Melnikov, 2005). Author's interpretation. 1 - the black line marks the contours of the Magellanic ring morphostructure (M).

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3. Fig. 2. The ring arrangement of large submarine rises (light colors), associated with guyots and other paleovolcanic structures, on the scheme of the visualized DEM of the northwestern segment of the Magellan Seamounts and the adjacent Marcus Wake mountain region from the northeast. 1 - ring contours of clusters of submarine rises and elevations; 2 - Letter designations - names of the largest MCTs of the studied region: M - Magellanic; D - Dutton, M-Wake - Marcus Wake. Arabic numerals are the names of individual guyots, information about which is given in the article: 1 - Himu, 2 - Golden Dragon, 3 - Hemler.

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4. Fig. 3. Paleovolcanic structures on the summits of the guyots of the Magellan Seamounts. According to (Melnikov M.E. et al., 2020), with additions and in the author's interpretation. a - northeastern part of the summit of the Dalmorgeologiya guyot (Alba), b - central part of the summit of the Butakova guyot (see Fig. 1). 1 - isobaths; 2 - zones of high gradients, thickening of isobaths; 3 - contours of the central parts of relatively young paleovolcanic structures; 4-5 - supposed magma-controlling: faults: 4 - rectilinear, 5 - arc and ring.

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5. Fig. 4. Scheme of focal structures M 1:7 000 000 of the NW segment of MG and the adjacent NE Marcus Wake Mountain region. Compiled on the basis of geological interpretation of the deciphering data of the visualized DEM (within the framework of the Google Pro program). 1 - focal structures of different sizes, types and ranks: a - large, b - small; 2 - external concentrations of magmatic paleodomes of Datton and Magellan; 3 - single lineaments correlated with faults; 4 - chains or rows of focal structures in zones of magma-controlling faults; 5 - systems of subparallel lineaments characteristic of regional faults. Relict domed uplifts are marked in large letters: D - Dutton, M - Magellan.

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6. Fig. 5. The northwestern section of the Pacific Ocean floor on the geological map of the World (Geological Map, 2000) with the contour of the Northwestern supraplume mega-arch (Gavrilov, 2022). The age of geological formations is shown in color: Late Jurassic - blue, Cretaceous - green, Cenozoic - yellow.

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7. Fig. 6. Scheme of radial-concentric distribution of Fe, Mn, Co mineralization within the Magellanic relict igneous arch and guyots. Compiled on the basis of materials (Melnikov, 2005), with simplifications, additions and in the author's interpretation. 1-4 - areas of distribution of concretions and crusts with different values of the gravimetric density of occurrence (kg/m2): 1 - less than 10; 2 - from 10 to 20; 3 ‒ from 20 to 30; 4 - more than 30; 5 – unproductive areas; 6 – ring faults of large ore-controlling focal structures.

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