دراسة رسوبية وتكتونية للحد الفاصل بين تكوين قمجوقة وتتابعات العصر الطباشيري العلوي لمقطعين مختارين - شمال شرقي العراق

الباحث

مهند عدنان نعمان عبدالله العبادي

المشرف

رافع إبراهيم عبدالله الحميدي - ربيع خلف حسن زناد

الجامعة

جامعة الموصل

الكلية / القسم

كلية العلوم / قسم علوم الأرض

الشهادة

ماجستير

السنة

2023

لغة الرسالة

عربي

الكلمات المفتاحية

تكوين قمجوقة ; الطباشيري العلوي ; الدراسة الرسوبية ; التكتونية

Study of the upper surface of the Qamchuqa Formation and the contact boundaries with other formations above has been performed. The Qamchuqa Formation, which was deposited during the period between the Albain and the middle of the Barrimian (Albain - Intra Barrimian), is considered a part of the sequences of the eighth cycle (AP8) of the Arabian Plate. Due to the lateral variation of the Qamchuqa Formation from the southeast to the northwest of northern Iraq, the formations that overlain differ starting from the Sulaymaniyah region. The study showed that the Qamchuqa Formation exposed in the Dokan region overlain unconformably with the Kometan Formation due to the evidences of unconformity that was obtained, such as the sharp contact boundary between the Qamchuqa and Kometan Formations and the missing Cenomanian age. Moving towards the northwest (Erbil region), specifically the Soran region, the upper boundary of the Qamchuqa Formation is exposed. This is where the formation above varies, being overlain by the Bekhma Limestone Formation. It is unconformable with the Qamchuqa Formation due to evidence of unconformity, including the existence of a local breccia layer, and exposed paleosols on the surface, as well as rhombic pieces filled with calcite, revealed the existence of the dedolomitization that was noticed in the petrographically studied samples. The mechanism of the evolution of the Forland-Zagros basin systems was studied, and the study also included the changes that occurred along the boundary between the eighth and ninth major sedimentary cycles. In the scope of this study, there is an increasing stratigraphic gap from the southeast toward the northwest between the Qamchuqa formation and the more recent formations (within the ninth cycle (AP9) of the Arabian Plate). This is due to the variation in the rheological properties of the continental lithosphere of the Arabian Plate and the opening and closing of the Tethys Ocean in a scissor shape, starting from the northwest towards the southeast.

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الاسم

رقم الهاتف

البريد الإلكتروني

الغرض من الطلب (اختياري)

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