نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی هندسه ساختاری و سطوح جدایشی تاقدیس دره‌بانه‌خاوری در پهنه لرستان، باختر زاگرس

نویسندگان
رضا علی پور 1
نسیم رحمانیان 1
عارف شمس زاده 2
1 دانشگاه بوعلی سینا
2 دانشگاه شیراز
10.29252/gnf.4.1.13
چکیده
تاقدیس دره­بانه­خاوری در پهنه ساختاری لرستان و در باختر کمربند چین­خورده-رانده زاگرس واقع شده است. در این پهنه گسل­های راندگی و سطوح جدایشی نقش مهمی در هندسه و کینماتیک ساختارهای چین­خورده ایفا می­کنند. در این پژوهش با استفاده از تفسیر پنج نیمرخ لرزه نگاری دوبعدی، ترسیم نیمرخ­های ساختاری، اطلاعات چاه­های حفاری شده در تاقدیس­های همجوار و تجزیه و تحلیل­های مربوطه، الگوی دگرریختی و هندسه ساختاری تاقدیس دره­بانه­خاوری مورد مطالعه قرار گرفته است. بر این اساس تاقدیس دره­بانه­خاوری از نوع چین­های جدایشی است که دو سطح جدایشی بالایی و میانی هندسه ساختاری آن را تحت تاثیر قرار داده است. سازند شیلی گرو به عنوان سطح جدایش میانی و سازند فلیشی امیران به عنوان سطح جدایش بالایی باعث دگرریختی منطقه شده است. ضخامت زیاد سطح جدایش بالایی باعث تشکیل تاقدیس­هایی با طول موج و دامنه کوتاه در سطح و همچنین باعث تشکیل چین­خوردگی­های ناهماهنگ سطحی روی تاقدیس­های عمقی شده است. همچنین تجزیه و تحلیل پارامترهای هندسی تاقدیس دره­بانه نشان می­دهد که این تاقدیس یک چین نامتقارن و غیراستوانه­ای و از نظر فشردگی باز و ملایم با نسبت ابعادی پهن است.
کلیدواژه‌ها
دره‌بانه
زاگرس
لرستان
تاقدیس
نیمرخ ساختاری

عنوان مقاله English

The study of structural geometry and detachment levels of the East Darreh-Baneh anticline, Lurestan zone, west Zagros

چکیده English

The East Darreh-Baneh anticline is located in the Lurestan structural zone, west of the Zagros fold and thrust belt. In this zone thrust faults and detachment horizons have a main role in geometry and kinematic of the folded structures. In this research, deformational pattern and structural geometry of the East Darreh-Baneh anticline have been studied using interpretation of five 2D seismic profiles, drawing of structural cross sections, drilling well data in the adjacent anticline and related analysis. Accordingly, the East Darreh-Baneh anticline is a detachment folding, in which two upper and middle detachment levels is affected its structural geometry. In the study area, the shaly Garu and the flysch Amiran formations caused deformations as a middle and upper detachment levels, respectively. The high thickness of the upper detachment level caused formation of the anticlines in surface with low wavelength and amplitude and formation of the surface disharmonic folding on deep-seated anticlines. Also, geometrical parameters analysis of the East Darreh-Baneh anticline indicate that this anticline is an asymmetric and noncylindrical fold and from tightness view is open to gentle with wide aspect ratio.

کلیدواژه‌ها English

Darreh-Baneh
Zagros
Lurestan
Anticline
structural cross section
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