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2020

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vol. 18 / 

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V. O. Oliinyk, A. V. Panko, I. G. Kovzun, V. A. Prokopenko,, O. A. Tsyganovich,, O. M. Nikipelova, I. O. Ageenko
«Structural, Nanostructural and Biocolloidal Transformations in Marine IronľAluminosilicate Sediments and Their Catastrophic Manifestations»
577–597 (2020)

PACS numbers: 47.61.Ne, 83.80.Nb, 91.50.Jc, 91.67.Ty, 92.10,Wa, 92.20.Vn, 92.40.Gc

The influence of nanostructural-biocolloidal processes in sea sediments on rheological properties of concentrated ironľaluminosilicate dispersions is studied. As shown, the change of their rheological properties significantly influences on catastrophic phenomena in sea turbiditicľpelitic sediments. Considering the laws of physicochemical geomechanics (PCHG), the causes and mechanisms of transformation of dispersions and sediments in the conditions of catastrophic phenomena are revealed. As established, such phenomena start by reaching the mechanical-stress level, which corresponds to the beginning of the transformation from elastic-into-plastic deformation of dispersions and sediments. Under the act of different factors, the elastic deformation first proceeds to laminar ultraanomal and then to hyperanomal plastic flow, and after all, to a turbulent flow through the dilatant, rheopexic, and thixotropic stages. It happens in conditions of sliding of huge masses of sediments and soils with the formation of catastrophic turbidity currents. As shown for the first time, such phenomena are controlled not as much by the contact nanostructural interactions in dispersions caused by colloidal, nanochemical, and geomechanical processes, but by biocolloidal interactions caused initially by bacterial and then by chemical reactions. In the last processes, iron-reducing and autotrophic bacteria, which produce thousands of amphiphilic surfactants of peptide series, play the important role. Such surfactants accelerate the dispersion of sediment minerals up to nanolevel, according to PCHG the laws, due to the acceleration of nanodestruction of ironľaluminosilicates by the mechanism of autohydrational dispersion.

Keywords: catastrophic phenomena, rheology, sea sediments, biocolloidal transformations, nanostructural transformations

https://doi.org/10.15407/nnn.18.03.577
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