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Register a new userCampanian age of the rudist vautrinia syriaca: paleogeographic implications; syria
عمر الكامبانيان للروديست Vautrinia syriaca: مضامين باليوجغرافية؛ سورية
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Damascus University ورقة بحثية
Publication date
2014
fields
Geology
and research's language is
العربية
Authors
ميخائيل معطي( باحث )
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Shamra Editor
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عدت المستحاثة Vautrinia syriaca مميزة لطابق الماستريختيان في منطقة الحافة الشمالية للسطيحة العربية. غير أن بحوثاً جديدة أظهرت أنه من غير الممكن اعتماد هذا التأريخ. فهذه المستحاثة في موقعيها الأصليين (جبل عبد العزيز و هضبة يايلا) موجودة بصورة منقحة ضمن رسوبات بريشية-كونغلوميراتية. و قد بينت التحاليل البيوستراتغرافية لبيئة الموقع الأول أنها عائدة إلى عمر الكامبانيان أو إلى عمر ماقبل الكامبانيان و ليس إلى عمر الماستريختيان. كما بينت الدراسة أن وجود المستحاثة Vautrinia syriaca ضمن توضعات بريشية كونغلوميراتية تعلو المعقد الأفيوليتي في الشمال الغربي من سورية (منطقة البسيط- تّلة ييلا) يدل على أن زحف المعقد الأفيوليتي إلى شمال السطيحة العربية قد حدث في زمن الكامبانيان أو زمن ما قبل الكامبانيان و ليس في زمن الماستريختيان. و قد أكد وجود كتل ضخمة من المعقد الأفيوليتي على سطح طبقات التورونيان الكلسية بالقرب من قرية سعرنجيك في منطقة جبال عفرين (الكرداغ) أن هذا المعقد الأفيوليتي قد استقر في موقعه على حافة السطيحة العربية في نهاية التورونيان/ بداية الكونياسيان و ليس في الماستريختيان. و يفسر هذا الزحف الأفيوليتي التجاوز البحري الهائل غلى السطيحة العربية منذ بداية السينونيان.
The Rudist Vautrinia syriaca (VAUTRIN) was considered so far as characteristic of the Maastrichtian of the northern margin of the Arabian platform, but new research shows that it is not possible to retain this consideration. Indeed, in both types localities (J. Abd Al Aziz and Yeyla) this rudist is present in breccia. The biostratigraphic analysis of the environment in the first locality can assign a Campanian age or precampanien age. The study demonstrated also that the presence of the Rudist Vautrinia syriaca (VAUTRIN) within breccia and conglomeratic sediments above the ophiolitic complex in the north-west of Syria (Al Bassite - Yella hill) shows that the ophiolite emplacement along the northern Arabian Platform has happened in the Campanian time or in Precampanian time and not during the Maastrichtian time. The presence of huge blocks of ophiolite on the surface of the Turonian limestone layers near Saarinjek village in Afrin Mountains (Kurdag) confirmed that the ophiolitic complex emplaced on the edge of the Arabian Platform at the end of the Turonian / early Coniacian, and not during the Maastrichtian. The obduction of the ophiolitic complex explains the big marine transgression on the Arabian Platform since the beginning of Senonian.
References used
AL-Maleh K. A. (1976). Etude stratigraphique, pétrographique, sédimentologique et géochimique du Cretace du N.W. Syrien (Kurd Dagh et environ d’Afrine). Thèse, Paris, 620 p
Al-Maleh K.A., Delaune M., Mouty M. And Parrot J. F. (1992). Relation du front de la nappe ophiolitique du NW Syrien avec son substratum de part et d’autre de la faille du Levant: Baer-Bassit, Kurd Dagh C.R. Acad. Sci., Paris, V. 314, P. 1195-1202
Alsharhan A. S. (1995). Facies variation, diagenesis and exploration potential of the Cretaceous Rudist-bearing carbonates of the Arabian Golf. Americain Assocition of Petroleum Geologists Bulletin. V. 79, p, 531 – 550
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