تحلیل هندسی تاقدیس بورخ، جنوب خاور کمربند چین¬خورده-رانده زاگرس
محورهای موضوعی :رمضان رمضانی اومالی 1 , ناصر حافظی مقدس 2 , احمد نوحه¬گر 3 , عبدالوهاب افروغ 4
1 - دانشگاه صنعتی شاهرود
2 - دانشگاه فردوسی مشهد
3 - دانشگاه تهران، تهران، ایران
4 - دانشگاه صنعتی شاهرود، شاهرود، ایران
کلید واژه: بستگي قائم و افقي تاقديس بورخ تحليل هندسي كمربند چين¬, خورده ـ رانده زاگرس گروه دهرم,
چکیده مقاله :
تاقدیس بورخ با روند WNW-ESE در جنوب شرق کمربند چین خورده-رانده زاگرس و در 40 کیلومتری شمال شهرستان بستک در ناحیه ساختاری فارس قرار دارد. در این مقاله براساس داده-های میدانی، تصاویر ماهوار ه ای و هفت برش ساختاری رسم شده عمود بر تاقدیس بورخ به بررسی هندسه آن پرداخته شده است. با توجه به وجود سازند هرمز به‌عنوان یک افق جدایش موثر در قاعده پوشش رسوبی و بر روی پی سنگ، و تطابق پارامترهای هندسی محاسبه شده از برش های ساختاری آن با نمودارهای هندسی چین های جدایشی، تاقدیس بورخ به‌صورت یک چین جدایشی، خمشی، نامتقارن و غیر هارمونیک می باشد. همچنین برای تعیین سبک یا هندسه از نظر فشردگی، واژه باز پیشنهاد می گردد. بازدید میدانی و برش های عرضی ساختاری ترسیم شده نشان می دهد که سازند دشتک به‌عنوان یک واحد جدایش میانی باعث تشکیل چین های فرعی در منطقه مورد مطالعه شده است. نقشه خطوط هم تراز زیرزمینی راس گروه دهرم در تاقدیس بورخ، میزان بستگی قائم تاقدیس را در حدود 1000 متر و میزان بستگی افقی آن را در حدود 200 کیلومتر مربع نشان می دهد.
Burkh anticline with the WNW-ESE trending is located in southeastern part of the Zagros fold-and-thrust belt and 40 km to the north of Bastak in the Fars zone. In this paper, based on the field data, satellite images and construction of the seven structural cross sections, structural geometry of the Burkh anticline is presented. Presence of the Precambrian- Cambrian of the Hormoz salt Formation as a basic detachment layer decouple the folded sedimentary cover from basement. Structural data show that the Burkh anticline is a detachment, buckle, asymmetrical and disharmonic fold. For describing tightness geometry of the fold, the term “open” is suggested. Field study and structural cross sections show that the Dashtak Formation as a middle detachment layer is the controlling factor for development of small-scale folding. Based on top of the Dehram Group underground contour map, vertical closure about 1000 m and horizontal closure of 200 km2 were calculated.
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