بررسی اختلاف های سنی و پلاتفرمی سازند تله زنگ بر اساس روند تغییرات روزنبران درشت کف زی پالئوژن پیشین در دو تاقدیس همجوار ریت و دریاگریوه در ناحیه جنوب غربی لرستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه علوم زمین، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران- ایران

2 استادیار پژوهشکده علوم زمین، ‌سازمان زمین‌شناسی و اکتشافات معدنی کشور، تهران، ایران

3 استاد، گروه علوم زمین، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران- ایران

4 دانشیار ، گروه علوم زمین، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران- ایران

چکیده

سازند عمدتاً کربناته تله زنگ یکی از سازند های اختصاصی ناحیه لرستان است که در حوضه پیش بوم امیران و با سن تانتین پسین- کوئیزین میانی در یک پلاتفرم کربناته کم عمق در محدوده مورد مطالعه نهشته شده و غنی از روزنبران درشت کف زی پالئوژن پیشین است. در برش های انتخاب شده این سازند از تاقدیس های ریت و دریاگریوه، علیرغم فاصله اندک از یکدیگر، از لحاظ ضخامت و خصوصیات تجمعات روزنبران درشت کف زی پالئوژن پیشین و سن آنها و همچنین از جنبه شرایط تکامل پلاتفرم های کربناته پالئوژن تتیس، اختلافات بارزی مشاهده می شود. از تاقدیس ریت به سمت تاقدیس دریاگریوه ضخامت سازند افزایش بارزی داشته و فرآیند رسوب گذاری جوان تر شده است. با توجه به زون هایی زیستی مشخص شده و همچنین با مقایسه شرایط تکامل پلاتفرم های پالئوژن در مقیاس جهانی، برش ریت در محدوده زون زیستیSBZ 4 به سن تانتین پسین و معادل مرحله دوم تکامل پلاتفرمی یا پلاتفرم مرجانی-جلبکی و اولین روزنبران درشت و برش دریا گریوه در محدوده زون های زیستی SBZ 10 و SBZ 11به سن کوئیزین پیشین و میانی و معادل مرحله سوم تکامل پلاتفرمی یا پلاتفرم روزنبران درشت قرار می گیرند. دلیل وجود اختلافات بارز در سن، رخساره های رسوبی و ویژگی های تکامل پلاتفرمی در سازند تله زنگ نه تنها به فرآیندهای رسوبگذاری بلکه به فرآیندهای تکتونیکی همزمان با رسوب گذاری که سبب ایجاد اختلافات واضح ضخامتی و رخساره ای و بروز دوزمانگی در واحد های سنگ چینه ای درون حوضه می شوند، منتسب می گردد

کلیدواژه‌ها

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