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Geophysical, magmatic, and metallogenic manifestations of a mantle plume in the upper reaches of the Aldan and Amur rivers

A. M. Petrishchevsky and Yu. P. Yushmanov
Geophysical, magmatic, and metallogenic manifestations of a mantle plume in the upper reaches of the Aldan and Amur rivers
Russian Geology and Geophysics (April 2014) 55 (4): 443-462

Abstract

Gravity models of the crust and upper mantle to a depth of 100 km are analyzed to study structural relationships of tectonic and tectonophysical media of different rigidities with the distribution of shallow ore deposits above the Aldan-Zeya plume. The spatial correlation of ore clusters and districts with high crustal viscosity inhomoheneities at depths of 10, 20, and 35 km shows distinct stepwise behavior. On the other hand, media of decreased viscosity are observed in the lower crust (at depths of 25-30 km), subcrustal (40-50 km) layers, and asthenosphere (at a depth below 70 km). They are related to chambers of the complete or partial melting (heat sources) of magmatic and ore occurrences near the Earth's surface. Lateral metallogenic zoning in the spatial distribution of the ore deposits is due to the spread and redistribution of magmas and ore-forming fluids, shielded by rigid plates in the lower crust. A naturally determined series of ore parageneses is observed from center to flanks of the plume: Au, Mo-->Au, Ag, Pb, Zn-->Au, Pb, Zn-->Au, W-->Au, Sb-->W, Sn-->Sn. The mutual position of the tectonomagmatic structures of different ranks within the plume head obeys hierarchical and fractal laws.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 55
Serial Issue: 4
Title: Geophysical, magmatic, and metallogenic manifestations of a mantle plume in the upper reaches of the Aldan and Amur rivers
Affiliation: Russian Academy of Sciences, Institute for Analysis of Regional Problems, Birobidzhan, Russian Federation
Pages: 443-462
Published: 201404
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 129
Accession Number: 2021-057035
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N52°00'00" - N58°00'00", E120°00'00" - E136°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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