چینه نگاری زیستی سازند تله زنگ، جنوب اسلام آباد غرب، حوضه لرستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد چینه شناسی و فسیل شناسی، گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان، خرم آباد، ایران.

2 دانشیار، گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان، خرم آباد، ایران.

3 دکترای چینه شناسی و فسیل شناسی، گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان، خرم آباد، ایران.

چکیده

در این پژوهش، توالی رسوبی سازند تله زنگ در برش تنگ کونر با برآورد اهداف زیست چینه­ نگاری، تعیین سن و سیستماتیک روزن­­داران برسی شده است. برش نامبرده در جنوب شرق اسلام آباد غرب، حوضه لرستان و پهنه زاگرس چین خورده واقع گردیده است و  با ضخامت 141 متر شامل سنگ آهک­ های توده­ ای می­باشد. سنگ آهک ­های سازند تله زنگ به صورت همشیب ولی با تغییر ناگهانی سنگ­ شناسی به ترتیب بر روی ماسه سنگ­ های سازند امیران و در زیر ماسه سنگ­ های سازند کشکان به صورت ناپیوسته قرار می­ گیرند. شناسایی 18 گونه و 25 جنس از روزن­داران کف­زی موجب شناسایی زون ­های زیستی SBZ3 و SBZ4 مشابه قلمرو تتیس باختری گردید. با توجه به زون ­های زیستی شناسایی شده سن پالئوسن پسین (تانتین) برای سازند تله زنگ برای برش مورد مطالعه پیشنهاد می­ شود. در برش مورد مطالعه مانند نهشته­ های تانتین تتیس خاوری و بر خلاف همین نهشته ­ها در تتیس باختری، تنوع روزن­داران کف­زی بسیار و در مقابل فراوانی جلبک­ های آهکی و مرجان ها بسیار کم می ­باشد.

کلیدواژه‌ها

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