Porosity and pore and throat size distributions in carbonate-rich salt caprock of halite diapirs: effect of deformation and geochemical processes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F25%3A00638138" target="_blank" >RIV/67985530:_____/25:00638138 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/25:10499473
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0191814125001580?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0191814125001580?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jsg.2025.105483" target="_blank" >10.1016/j.jsg.2025.105483</a>
Alternative languages
Result language
angličtina
Original language name
Porosity and pore and throat size distributions in carbonate-rich salt caprock of halite diapirs: effect of deformation and geochemical processes
Original language description
Microscopic porosity of salt caprock on two salt diapirs, Karmostaj and Siah Taq in southern Iran, was studied on a range of samples that represent the major lithological types of salt caprock in the area: the gypsum matrix-supported and clast-supported dissolution breccia, the dolomite and limestone stringers of the Hormuz Formation and gypsum mylonites. Mercury intrusion porosimetry alongside the microstructural analysis with digital image analysis of resin-saturated thin-sections was employed and revealed a large variation in porosity of 2-35 % and in the median throat size of 0.1-50 mu m. The highest porosity values are associated with vuggy dolomites and limestones interspersed by a dense network of gypsum veins and gypsum matrix-supported breccia with low degree of deformation. In contrast, low porosity is linked with strongly deformed gypsum matrix-supported breccias and dark micritic carbonate stringers that were not interspersed with the gypsum. Large variation in porosity and pore throat size and pore shape is attributed to 1) metasomatization of carbonate to gypsum due to reaction of H2SO4 with carbonate after oxidation of H2S or elemental sulfur in caprock and subsequent dissolution of gypsum in metasomatized carbonates creating the abundant vuggy porosity and 2) deformation of the caprock that was responsible for recrystallization and mechanical closure of pores in the frontal, downslope margins of both reactivated diapirs. While the deformed and gypsum-rich parts of the diapir caprocks (similar to 30-60 % of caprock on the diapirs) are associated with estimated permeabilities of similar to 10(-1)(6) 10(-1)(5) m(2), caprocks in central parts of reactivated diapirs with less deformed caprock (undeformed gypsum- and clast-supported breccia) display higher permeabilities ranging between similar to 10(-15) m(2) and 10(-13) m(2).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Structural Geology
ISSN
0191-8141
e-ISSN
1873-1201
Volume of the periodical
199
Issue of the periodical within the volume
Oct.
Country of publishing house
GB - UNITED KINGDOM
Number of pages
18
Pages from-to
105483
UT code for WoS article
001528134300001
EID of the result in the Scopus database
2-s2.0-105009502589