تحلیل الحد الفاصل الکریتاسی / البالیوجین فی نطاق الطیات الزاحفة الزاکروس الغربیة (وادی أسماقولی) محافظة السلیمانیة، شمال شرق العراق

نوع المقالة : بحث

المؤلفون

1 قسم المساحة، الکلیة التقنیة کرکوک، الجامعة التقنیة الشمالیة، کرکوک ،العراق.

2 معهـد کوردستان للدراسات الأستراتیجیة والبحوث العلمیة ،السلیمانیة، العراق.

3 قسم علم الأرض، کلیة العلوم، جامعة السلیمانیة، السلیمانیة، العراق.

الملخص

 ترکز الدراسة الحالیة على دراسة تجمعات الفوارامنیفیرا ضمن ترسبات الحد الفاصل بین الکریتاسی والبالیوجین المنکشفة فی نطاق الطیات العالیة فی وادی الأسماقولی (مقطع کلی)، أقلیم کردستان، شمال شرق العراق. یتموضع هذا الحد الفاصل تقریبا بین تکوینا تانجرو و کولوش ذات المکاشف المؤلفة من تتتابعا ت  وترسبات المیاه العمیقة. (flysch) للترسبات المیاه البحریة العمیقة الخابطة، و تهدف الدراسة إلى تحدید تجمعات الأحافیر البیولوجیة والتغیرات الفیزیاویة التی ورثت من الأحداث المهمة عالمیاً لنهایة الطباشیری.                           
تضمنت الدراسة تعبیرات إضافیة عن التعاقب المکشوف جیدًا للترسیات دقیقة الحبیبات التی تم تحدید 8 أنطقة حیاتیة منها فی الجزء العلوی من تکوین شیرانیش ومنطقة انتقال شیرانیش- تانجیرو وتکوین تانجیرو من خلال تحدید الأنطقة الحیاتیة Globotruncana aegyptiaca والصخریة. وهذه الأنطقة من الأسفل الى الأعلى ممثلة بالجزءالعلوی لنطاق الماسترختیان ) والذی یمثل الجزء العلوی لتکوین شیرانش والجزء السفلی لتکوین تانجرو  Interval (CF8) Zone المبکر) أما النطاق الثانی والثالث والرابع والخامس ممثلة بالأنطقة التالیة على التوالی والذی یعود للجزء السفلی لتکوین  تانجیرو  والتی لها عمر (الماسترختیان المبکر).
)Gansserina gansseri Interval Zone (CF7), Contusotruncana contusa Interval Zone (CF6) (Early Maastrichtian) and Pseudotextularia intermedia Interval Zone (CF5), Racemiguembelina ,fructicosa Interval Zone (CF4)
أما الأنطقة السادس والسابع والثامن ممثلة بالأنطقة التالیة على التوالی والتی تعود الى الجزء العلوی لتکوین تانجیرو. Pseudoguembelina hariaensis Interval Zone (CF3), Pseudoguembelina palpebra IntervalZone  (CF2), Plummerita hantkeninoides Total Range Zone (CF1) و بعمـــر (الماسترختیان المتأخر.(
   ومن الجزء السفلی لتکوین کولوش والممثلة بالأنطقة التالیةDanian بالأضافة الى أربعة أنطقة تم تسجیلها من عمر
Guembelitria cretacea Interval Zone (p0), (base of Danian), Parvularugoglobigerina eugubina Total Range Zone (pα), (base of Danian), Parvularugoglobigerina eugubina-Subbotina triloculinoides Interval Zone (P1a) (Early Danian), Subbotina triloculinoides–Praemurica inconstans Interval Zone (P1b), (Middle Danian).
کشفت الدراسة الطباقیة الصخاریة والحیاتیة بعدم وجود  أحداث فیزیائیة مثل( وجود مدملکات وسطوح تعریة وترب قدیمة وارض صلبة) وان الحد الفاصل بین  الترسبات  للکریتاسی والبالیوجین متوافقة ومتدرجة الترسیب والذی یتضح من  الترسیب المستمر لنفس الرواسب ولعدم وجود فجوة  طباقیة زمنیة على جانبی الحد الفاصل. وکذلک من ناحیة التواجد الحیاتی لوحظت  أنقراض تدریجی للفورامنیفیرا الطافیة للکریتاسی والظهور المفاجئ لأنواع البالیوسین.

الكلمات الرئيسة

الموضوعات


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