Deformation and recrystallization mechanisms in glacier salt: Evolution of microstructures inferred from EBSD and microstructural analyses (Kuh-e-Namak diapir (Dashti, Iran))

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F25%3A00619725" target="_blank" >RIV/67985530:_____/25:00619725 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/25:10169808

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0191814125001166?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0191814125001166?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsg.2025.105441" target="_blank" >10.1016/j.jsg.2025.105441</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Deformation and recrystallization mechanisms in glacier salt: Evolution of microstructures inferred from EBSD and microstructural analyses (Kuh-e-Namak diapir (Dashti, Iran))

Popis výsledku v původním jazyce

This study presents a detailed microstructural analysis of salt samples collected from the exposed mountain glacier in Iran, the Kuh-e-Namak (Dashti). Our goal is to pinpoint the different deformation mechanisms leading to grain size reduction and, how these, together with the influx of rainwater and development of porosity, affect the creep of the polycrystalline halite. We investigated 17 gamma-irradiated thin sections by transmitted and reflected light microscopy, quantitative grain and subgrain statistics, and crystallographic-preferred orientation (CPO) mapping using Electron Back Scattered Diffraction (EBSD). The microstructural evidence suggests a combination of solution-precipitation accompanied by grain-boundary sliding and dynamic recrystallization. The grain size decreases by subgrain rotation recrystallization, microcracking, and grain boundary migration by three different mechanisms: 1) grain boundary bulging into grains, 2) nucleation of new grains and, 3) segmentation of porphyroclasts by planar domains of dynamic recrystallization. The mean grain size ranges from 118 to 508 μm and subgrain sizes from 14 to 99 μm from which differential stresses between 1.9 and 10.2 MPa were calculated. Inferred strain rates for the glacier are in the order of magnitude of 10−10-10−8 s−1. The increasing shape-preferred orientation of halite grains from the crestal domal part of the diapir towards the frontal parts of extrusive glaciers is interpreted as a result of dominant solution-precipitation creep and salt flow. Rainwater influx rendering this important deformation mechanism switch is attributed to the development of porosity along microcracks and grain boundaries.

Název v anglickém jazyce

Deformation and recrystallization mechanisms in glacier salt: Evolution of microstructures inferred from EBSD and microstructural analyses (Kuh-e-Namak diapir (Dashti, Iran))

Popis výsledku anglicky

This study presents a detailed microstructural analysis of salt samples collected from the exposed mountain glacier in Iran, the Kuh-e-Namak (Dashti). Our goal is to pinpoint the different deformation mechanisms leading to grain size reduction and, how these, together with the influx of rainwater and development of porosity, affect the creep of the polycrystalline halite. We investigated 17 gamma-irradiated thin sections by transmitted and reflected light microscopy, quantitative grain and subgrain statistics, and crystallographic-preferred orientation (CPO) mapping using Electron Back Scattered Diffraction (EBSD). The microstructural evidence suggests a combination of solution-precipitation accompanied by grain-boundary sliding and dynamic recrystallization. The grain size decreases by subgrain rotation recrystallization, microcracking, and grain boundary migration by three different mechanisms: 1) grain boundary bulging into grains, 2) nucleation of new grains and, 3) segmentation of porphyroclasts by planar domains of dynamic recrystallization. The mean grain size ranges from 118 to 508 μm and subgrain sizes from 14 to 99 μm from which differential stresses between 1.9 and 10.2 MPa were calculated. Inferred strain rates for the glacier are in the order of magnitude of 10−10-10−8 s−1. The increasing shape-preferred orientation of halite grains from the crestal domal part of the diapir towards the frontal parts of extrusive glaciers is interpreted as a result of dominant solution-precipitation creep and salt flow. Rainwater influx rendering this important deformation mechanism switch is attributed to the development of porosity along microcracks and grain boundaries.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GC20-18647J" target="_blank" >GC20-18647J: Vliv caprocku na dynamiku růstu solných těles v Iránu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Structural Geology

ISSN

0191-8141

e-ISSN

1873-1201

Svazek periodika

198

Číslo periodika v rámci svazku

Sept.

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

105441

Kód UT WoS článku

001486464500001

EID výsledku v databázi Scopus

2-s2.0-105003954114