دورية أكاديمية
Facies and geochemistry of non-marine gypsum, EMISAL, Egypt
| العنوان: | Facies and geochemistry of non-marine gypsum, EMISAL, Egypt |
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| المؤلفون: | Ali-Bik, M.W., Metwally, H.I.M., Wali, A.M.A., Kamel, M.G. |
| المصدر: | Geologica Acta; 2013: Vol.: 11 Núm.: 4; p. 409-420 |
| Publication Status: | published |
| بيانات النشر: | Universitat de Barcelona, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | Gypsum, Lithofacies, Non-marine, Geochemistry |
| الوصف: | Diverse gypsum facies in terms of crystal size and morphology are deposited in a shallow, non-marine, sulfate-enriched, semi-closed, perennial evaporite basin. These gypsum facies were deposited in intimate association with cyanobacterial mats. Facies analyses and geochemistry revealed two distinct primary facies, based on gypsum fabric; massive selenite, and laminated gypsum varieties. The massive selenite facies is composed of clusters of single and twinned crystals along (100), with upward pointing re-entrant angle. The laminated gypsum varies from rhythmically laminated grass-like selenite to gypsum microbialite (stromatolite). The change from massive selenite to laminated gypsum facies implies fluctuation in lateral and vertical salinity profiles, seasonal brine concentrations and wind action. Post-depositional changes in the form of dissolution, slight to moderate crystal deformation and recrystallization to anhydrite are evaluated. We develop a qualitative model for the depositional basin and facies distribution in order to simulate ancient analogues. |
| نوع الوثيقة: | article |
| وصف الملف: | application/pdf |
| اللغة: | Catalan; Valencian |
| تدمد: | 1696-5728 1695-6133 |
| Relation: | https://www.raco.cat/index.php/GeologicaActa/article/view/271209/358853 |
| URL الوصول: | https://www.raco.cat/index.php/GeologicaActa/article/view/271209 |
| رقم الأكسشن: | edsrac.271209 |
| قاعدة البيانات: | RACO (Revistes Catalanes amb Accés Obert) |
Full Text Finder | تدمد: | 16965728 16956133 |
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