Depositional conditions affecting proximal to distal variation in the crystallo-chemical properties of Paleogene glauconites: Example from the Mesopotamian basin, Iraq
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73633916" target="_blank" >RIV/61989592:15310/25:73633916 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0264817225003083" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0264817225003083</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.marpetgeo.2025.107591" target="_blank" >10.1016/j.marpetgeo.2025.107591</a>
Alternative languages
Result language
angličtina
Original language name
Depositional conditions affecting proximal to distal variation in the crystallo-chemical properties of Paleogene glauconites: Example from the Mesopotamian basin, Iraq
Original language description
The proximal to distal variation in glauconite composition across a basin, although rarely attempted, may provide crucial insights into the depositional conditions. The Paleogene glauconites from the transgressive and condensed deposits are tracked from the proximal to the distal parts of the Mesopotamian basin in Iraq, to delineate their compositional variation. They prevail within the Paleocene Upper Aaliji Formation and the Eocene basal Jaddala Formation. The Fe2O3(total) (av. 16.78 wt%) and K2O (av. 7.04 wt%) contents, and the ordering of the crystal structure and maturity (decreasing d-spacing and FWHM of 001 basal reflection) of glauconites increase, while the Al2O3 (av. 9.82 wt%) and MgO (av. 5.24 wt%) contents decrease from the proximal to distal settings. Therefore, the Al-rich and less mature glauconite is attributed to the proximal setting, whereas Fe-rich and more mature glauconites are attributed to the central and distal settings. The proximal setting is enriched with detrital Al-rich clay minerals forming less mature, Al-rich glauconites in kaolinite and illite-smectite precursors within the prevailing gently suboxic conditions. Whereas the central and distal settings sustain a lower sedimentation rate and enhanced mobility of ferrous ions, forming more mature, Fe-rich glauconites within the prevailing oxygen-depleted conditions. Glauconites form within two warming intervals from Late Danian to Late Ypresian and Late Lutetian to Late Bartonian. Warm climatic conditions amplify elemental supply, promote transgressive conditions, intensify reaction kinetics, and produce redox conditions encouraging abundant growth of glauconite. The composition and abundance of glauconites corroborate their formation within warm climatic conditions.
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
—
Continuities
N - Vyzkumna aktivita podporovana z neverejnych zdroju
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
MARINE AND PETROLEUM GEOLOGY
ISSN
0264-8172
e-ISSN
1873-4073
Volume of the periodical
182
Issue of the periodical within the volume
DEC
Country of publishing house
GB - UNITED KINGDOM
Number of pages
13
Pages from-to
"107591-1"-"107591-13"
UT code for WoS article
001567932600002
EID of the result in the Scopus database
2-s2.0-105014388025