Journal Title
Title of Journal: Arab J Geosci
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Abbravation: Arabian Journal of Geosciences
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Publisher
Springer-Verlag
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Authors: Hossam A Tawfik Esam K Zahran Abdel T AbdelHameed Wataru Maejima
Publish Date: 2010/05/28
Volume: 4, Issue: 3-4, Pages: 517-534
Abstract
The widely exposed siliciclastic/carbonate succession exposed at Gebel ElQurn west Luxor has been investigated from the mineralogical petrographical and biostratigraphical points of view The succession belongs to the lower Eocene including the upper Esna Shale and the Thebes Formations that have been deposited under varied marine conditions and during alternating periods of abundant and ceased clastic influx They contain abundant and welldiversified planktonic foraminifera and calcareous nannoplankton suggesting deposition in open marine inner to middle shelf environments Mineralogical analysis carried out by XRD revealed the presence of smectite illite kaolinite sepiolite palygorskite and smectite–illitemixed layer as the principal clay minerals and calcite dolomite quartz anhydrite gypsum hematite and goethite as nonclay minerals The clay mineral distributions in the sediments reflect the climatic conditions and the weathering processes at the source area as well as the differential hydraulic sorting during transportation Calcite is the most abundant nonclay mineral and this is consistent with high calcareous fossil content of the sediments Petrographic examination of the carbonate lithologies within the succession enables to identify eight microfacies associations These microfacies were affected by several diagenetic processes including micritization compaction cementation neomorphism dissolution dolomitization and silicification Dissolution of original test wall and replacement and infilling by iron oxides and recrystallized calcite were commonly observed Calcareous nannofossils are generally common to frequent highly diversified and moderately to well preserved Two calcareous nannofossil biozones Tribrachiatus contortus Zone NP10 and Discoaster binodosus NP11 are recorded in the studied sediments suggesting lower Eocene age Their associated nannofossil taxa are characterized by the predominance of warm water species Sealevel fluctuations basin physiography climate paleogeography and sediment supply were the major controls on the deposition of the lower Eocene sediments at Gebel ElQurnتم دراسة التتابع الفتاتي السيليسي/ الجيري بجبل القرن غرب مدينة الأقصر بهدف التعرف علي التركيب المعدني والخصائص البتروجرافية والبيواستراتجرافية لهذة الصخور وينتمي هذا التتابع للأيوسين السفلي ويشمل تكوينى الأسنا العلوي وطيبه اللذان ترسبا تحت ظروف بحرية متباينه أثناء فترات متفاوته من زيادة وقلة النشاط الفتاتي وتحتوي هذه الصخور علي أنواع عديدة ومتنوعة من الفورامينفرا الهائمة والنانوبلانكتون الجيرية والتي تشير إلي الترسيب في بيئة بحرية عميقة إلي متوسطة، ويشير التحليل المعدني باستخدام حيود الأشعة السينية إلي وجود معادن الأسمكتيت، الأليت، الكاولينيت، السبيوليت والباليجورسكيت اضافه إلي معادن الطين المختلطه من الأسمكتيت/الأليت في حين تشكل معادن الكالسيت والدولوميت والكوارتز والأنهيدريت والجبس والهيماتيت والجوتايت مجموعة المعادن غير الطينية وقد ساهم توزيع المعادن الطينية في التعرف علي الظروف المناخية وعمليات التجوية لصخور المصدر وكذا تباين درجات الفرز اثناء عمليات النقل للرواسب ويعتبر الكالسيت من أكثر المعادن الغير طينية انتشارا في الصخور وهو ما يتمشي مع زيادة المحتوي الأحفوري للرواسب وقد أدت الدراسة البتروجرافية للصخور الجيرية إلي تقسيم التتابع إلي ثمانية سحنات صخرية تأثرت بالعديد من عمليات ما بعد الترسيب كترسيب الجير، التضاغط، السمنته، اعادة التشكل، الأذابة، الدلمته، الأحلال بالسليكا والأمتلاء بالحديد اضافة إلي اعاده التبلور وتتباين احافير النانوبلانكتون الجيرية في درجة انتشارها في الصخور وتنوعها وكذا درجة الحفظ لها كما تم تسجيل نطاقين احفوريين يشيرا إلي الأيوسين السفلي هذا ويلعب تذبذب مستوي سطح البحر وشكل الحوض الترسيبي والمناخ والجغرافية القديمة ومعدل الأمداد للرواسب دورا هاما في ترسيب الأيوسين السفلي في المنطقة
Keywords:
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