Yeşilova P. G., Dalga H.
CARBONATES AND EVAPORITES, cilt.41, sa.2, ss.83, 2026 (SCI-Expanded, Scopus)
-
Yayın Türü:
Makale / Tam Makale
-
Cilt numarası:
41
Sayı:
2
-
Basım Tarihi:
2026
-
Doi Numarası:
10.1007/s13146-026-01287-1
-
Dergi Adı:
CARBONATES AND EVAPORITES
-
Derginin Tarandığı İndeksler:
Scopus, Science Citation Index Expanded (SCI-EXPANDED), Geobase, DIALNET
-
Sayfa Sayıları:
ss.83
-
Van Yüzüncü Yıl Üniversitesi Adresli:
Evet
Özet
Abstract
The Van–Çatak gypsum succession exposed along the Bitlis–Zagros Suture Zone in Eastern Anatolia records evaporite deposition during the final stages of Neotethyan closure at the Arabia–Eurasia plate boundary. This study integrates sedimentological observations, petrography, SEM–EDS analyses, whole-rock major and trace element geochemistry, and Sr–S–O isotope systematics to constrain the origin, depositional environment and post-depositional evolution of these evaporites. The succession comprises laminated, massive, selenitic and nodular–chicken-wire gypsum associated with marl and carbonate units, reflecting progressive hydrological restriction within a shallow marginal basin periodically influenced by marine inflow and intense evaporation. Petrographic and SEM data indicate in-situ gypsum growth within soft sediments together with partial anhydritization, recrystallization, oxidation-related alteration, brecciation and fracture-controlled satin-spar veins, documenting multi-stage dehydration–rehydration cycles during burial, uplift and near-surface modification while preserving primary depositional signatures. Major and trace element systematics reveal alternating sulfate precipitation and siliciclastic dilution, detrital-element associations (K–Al–Ti–Zr), and redox-sensitive element distributions (Fe–Mn–U–Mo–Ni–Co) indicating fluctuating oxic to suboxic conditions and stratified brines. Elevated Sr concentrations and high Sr/Ca–Sr/Ba ratios reflect progressive brine concentration. Strontium isotope ratios (⁸⁷Sr/⁸⁶Sr = 0.70814–0.70991), together with uniform δ
34
S (17.2–18.9‰) and evaporation-enriched δ
1
⁸O values (14.3–15.7‰), confirm precipitation from marine-derived sulfate under restricted circulation. These results demonstrate formation within a restricted marginal-marine lagoon–sabkha system rather than a continental salina and provide new constraints on the marine versus continental origin of collision-zone evaporites during Neogene basin evolution along the Arabia–Eurasia convergence zone.