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Hydrothermal alterations of the chemical composition in grain size fractions of sediments in the Guaymas Basin, Gulf of California

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Abstract

The paper presents data on the contents of macro- and microelements (rare earth elements included) determined in grain size fractions of the Upper Pleistocene hydrothermally altered and unaltered sediments from the Guaymas Basin (Gulf of California). Sediments subjected to high-temperature hydrothermal alteration were recovered by DSDP Hole 477A. In the finely dispersed fractions, which are mainly composed of clay minerals, alteration of the chemical composition was provoked by the hydrothermal transformation of terrigenous clay minerals. The concentration of microelements in these fractions takes place primarily at the cost of the hydrothermal finely dispersed ore minerals. Alteration of the chemical composition of the coarse-grained fractions is related to the replacement of clastogenic minerals by the secondary varieties and the formation of new minerals (including ore minerals and native metals) from the solutions. Hydrothermal alterations of the chemical composition of bulk samples depend on the degree of chemical element concentration in fractions and their content in samples.

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia

    V. B. Kurnosov & Yu. I. Konovalov

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  1. V. B. Kurnosov
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  2. Yu. I. Konovalov
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Correspondence to V. B. Kurnosov.

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Original Russian Text © V.B. Kurnosov, Yu.I. Konovalov, 2016, published in Litologiya i Poleznye Iskopaemye, 2016, No. 6, pp. 501–529.

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Kurnosov, V.B., Konovalov, Y.I. Hydrothermal alterations of the chemical composition in grain size fractions of sediments in the Guaymas Basin, Gulf of California. Lithol Miner Resour 51, 439–466 (2016). https://doi.org/10.1134/S0024490216060067

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  • DOI: https://doi.org/10.1134/S0024490216060067

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