Abstract
The article presents the results of study of composition, structure and properties of three genetic types of serpentinites from Ural: developed by chromite-bearing ultrabasic rocks, by metamorphic zones of carbonate rocks and within the zone of weathering of ultrabasic rocks. The samples were selected from deposits, located along the Main Ural Fault - the Paleozoic subduction zone (named GUR). Peculiarities of microstructure, chemical composition and properties of serpentinites formed in different geological conditions were investigated and their comparative study was held. Three groups of serpentinites with oriented and non-oriented structure, which formed by different protholites, were devided: mantle, lithosphere and crust.
Highlights
Serpentine is a polygenic mineral which is forming in various geological conditions
Experimental studies show that various polymorphic modifications of serpentine are stable at different temperatures and pressures, and the antigorite is a stable phase under conditions of high pressures
That the samples of different genetic types have a different shape of acoustic emission (AE) curves and it is caused by differences in their textural and structural characteristics, which were formed in the magmatic, metasomatic and exogenous stages of their formation
Summary
Serpentine is a polygenic mineral which is forming in various geological conditions. Experimental studies show that various polymorphic modifications of serpentine are stable at different temperatures and pressures, and the antigorite is a stable phase under conditions of high pressures. The obtained experimental data show that elastic characteristics of minerals change depending on phase composition of serpentine [1] These data show that serpentine can be the reference points of deep mantle and subduction processes [2]. Any water bearing phase arising in P-T conditions compatible with the subducted slab is highly interesting for the comprehension of the complex geological processes determining the dynamical evolution of subducting zones. In this regard it is actual to study different serpentine from various deposits and detect features of the minerals formed at high pressures and temperatures
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