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

Result code in 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>

Alternative codes found

RIV/00025798:_____/25:10169808

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GC20-18647J" target="_blank" >GC20-18647J: Influence of caprock on the growth dynamics of salt diapirs in Iran</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Journal of Structural Geology

ISSN

0191-8141

e-ISSN

1873-1201

Volume of the periodical

198

Issue of the periodical within the volume

Sept.

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

105441

UT code for WoS article

001486464500001

EID of the result in the Scopus database

2-s2.0-105003954114