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Register a new userDescription of silicified geodes within Slunfeh formation and determination of their minerals and crystal habits
توصيف الجيودات السيليسية المنتشرة في تشكيلة صلنفة و تحديد تركيبها الفلزي و هيئات تبلورها
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Aِl-Baath University ورقة بحثية
Publication date
2018
fields
Geology
and research's language is
العربية
Authors
ندى سلمان( باحث )
Created by
Shamra Editor
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تم توصيف الجيودات السيليسية الشبيهة بثمرة القرنبيط في تشكيلة صلنفة العائدة للكريتاسي الأعلى. استخدم مطياف الأشعة تحت الحمراء متوسط المدىFTIR لتحديد التركيب الفلزي لهذه الجيودات. استخدم المجهر الاستقطابي لدراسة المقاطع المجهرية المأخوذة من داخل الجيودات لتحديد هيئات التّبلور المشكّلة لها. بيّنت النتائج أن جيودات التشكيلة المدروسة ذات تركيب سيليسي يتجلى بشكل أوبال غير مبلور و خفي التبلور، كالسيدوان ليفي شعاعي البنية مجهري التبلور، كوارتز كبير الحبيبية بهيئة مواشير سداسية، كوارتز شعاعي، كوارتز نطاقي، و كوارتز موزاييكي.
Cauliflower silicified geodes within Slunfeh Formation of upper cretaceous were described. Mid-range infrared spectroscopy FTIR was used for determination of mineral composition of these geodes. Polarized light microscope was used for the study of thin sections taken from inner parts of geodes in order to determine their crystal habits. The results showed that geodes of studied formation consists of silicon in form of amorphous to cryptocrystalline opal, chalcedony of micro-crystalline fibrous radial structure, hexagonal prismatic quartz, radial quartz, zoned quartz and mosaic quartz.
References used
Makhlouf, M., Recognition of quartz geodes in the Upper Cretaceous Wadi Umm Ghudran Formation, Ras En Naqab, South Jordan. Arab J Geosci, 2015, 1535-1547
Chowns, T.M., Elkins, J.E., The origin of quartz geodes and cauliflower cherts through the silicification of anhydrite nodules. Sediment Petrol, 1974, 885-903
Maliva, R.G., Quartz geodes: early diageneticchertifiedanhydritenodules related to dolomitization. J Sed Petrol, 1987, 1054-1059
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