Szczegóły publikacji
Opis bibliograficzny
Paleoenvironmental conditions across the Jurassic–Cretaceous boundary from northern Arabia: facies analysis, mineralogical and geochemical implications / Alaa M. Al-Wazan, Ali I. Al-Juboury, Nisreen M. Aziz, Ahmed H. Al-Obeidi, Nasir Alarifi, Harry Rowe, Giovanni Zanoni, Justyna KOWAL-KASPRZYK, Anna WAŚKOWSKA, Nagham Omar, Fathy Abdalla // Journal of African Earth Sciences ; ISSN 1464-343X . — Błędny ISSN 0899-5362. — 2026 — vol. 240 art. no. 106165, s. 1–24. — Bibliogr. s. 22–24, Abstr. — Publikacja dostępna online od: 2026-04-13
Autorzy (11)
- Al-Wazan Alaa M.
- Al-Juboury Ali I.
- Aziz Nisreen M.
- Al-Obeidi Ahmed H.
- Alarifi Nasir
- Rowe Harry
- Zanoni Giovanni
- AGHKowal-Kasprzyk Justyna
- AGHWaśkowska Anna
- Omar Nagham
- Abdalla Fathy
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 167191 |
|---|---|
| Data dodania do BaDAP | 2026-05-21 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jafrearsci.2026.106165 |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of African Earth Sciences |
Abstract
The present research focuses on the microfacies analysis and paleoenvironmental proxies (paleoredox, and paleoclimate) during the Jurassic– Cretaceous period of Chia Gara Formation in northeastern Iraq. To this end, mineralogical investigation using X-ray diffraction, supported by scanning electron microscopy with energy-dispersive-X-ray spectroscopy (SEM-EDS) and geochemical paleoredox-sensitive elements such as uranium, thorium and potassium and calculated ratios of Th/U and Th/K (ppm%) as paleoenvironmental proxies in addition to Total Organic Carbon (TOC) of the J/K Chia Gara Formation from Zeni Warte and Surdash outcrop sections, northeastern Iraq, are conducted. Three microfacies and six submicrofacies were recognized: MFT1 – mudstone microfacies (submicrofacies: fossil-poor muddy micrite, mudstone/muddy micrite with rare microfossils, frutexites laminated mudstone), MFT2 – radiolarian microfacies (subdivided into mudstone, wackestone and wackestone to packstone texture submicrofacies), MFT3 – nannoconid microfacies. The depositional environment is suggested to be open marine, at least deep shelf zone. The paleoredox proxies of Th/U ratio and size of pyrite framboids suggest anoxic-dysoxic environment. Redox fluctuations influence on the concentrations of the organic matter, which exhibits a declining trend, with the minimum values in the upper division of the investigated sections. Paleoclimate proxies of clay minerals illite/smectite, illite-mica and kaolinite along with high ratios of Th/K and low, nearly stable Th/U ratio suggest climatic variation between arid condition and more humid, warm phases during deposition of the studied formation.
