زیست چینه نگاری، زیست رخساره‌ها و شاخص تغییر رنگ کنودونت‌ها در نهشته‌های دونین میانی ـ بالایی برش کوه بند عبدالحسین (جنوب شرق انارک)

رخساره‌های رسوبی

مقاله 2، دوره 12، شماره 2 - شماره پیاپی 23، اسفند 1398، صفحه 174-193   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/sed.facies.v12i2.69795

نویسندگان

بهاره شاکری¹؛ علی بهرامی^{* 1}؛ حسین وزیری مقدم¹؛ پیتر کونیگشوف²

¹دانشگاه اصفهان

²مؤسسه پژوهشی سنکنبرگ، موزه تاریخ طبیعی فرانکفورت آلمان

چکیده

برش چینه شناسی کوه بند عبدالحسین در 35 کیلومتری جنوب شرقی انارک و در 180 کیلومتری شمال شرق اصفهان جای دارد. ضخامت سازند بهرام در این برش 366 متر و شامل 14 واحد سنگ چینه‌ای می‌باشد. به منظور تعیین سن دقیق نهشته‌های مورد بحث تعداد 78 نمونـه بـه طـور سیسـتماتیک برداشت گردید که پس از انجام مراحل آزمایشگاهی و آماده سازی، تعداد 917 1 عنصر کنودونتی از آنها به دست آمده است. بررسی کنودونت‌های به دست آمده به شناسایی 41 گونه و زیرگونه متعلق به 6 جنس منجر گردید. با توجه به کنودونت‌های به دست آمده از این توالی 6 زیست‌زون کنودونتی شـامل expansus zone، subterminus zone، upper falsiovalis to transitan zones، transitan to Lower rhenana zones، Upper rhenana to linguiformis zones و triangularis to termini zones تعیین شد. با توجه به زیست‌زونهای تعیین شده سن نهشته‌های مورد بررسی از ژیوتین پسین تا فامنین پیشین تعیین گردید. مطالعه فراوانی کنودونت‌ها و بررسی ریزرخساره‌های کنودونتی نیز حاکی از رخساره Polygnathis-Icriodid در بخش‌هـای پائینی برش و رخساره Icriodid-Plygnathid در بخش‌های با سن فرازنین میانی ـ پسین می‌باشد که این تغییر رخساره کنودونتی حاکی از پیش‌روی آب دریا می‌باشد. در مرز فرازنین ـ فامنین افزایش تعداد پالماتولپییدها حاکی از افزایش سطح ناگهانی آب و مؤید حادثه زیستی کلواسـر مـی‌باشـد. بررسـی تغییرات رنگ کنودونت‌ها نیز حاکی از این موضوع می‌باشد به طوری که در انتهای ژیوتین شاخص تغییر رنـگ کنودونـت‌هـا CAI=2-5/1، در اوایـل فرازنین این شاخص معادل CAI=5.4-4 و به سمت انتهای فرازنین و فامنین مجدداً شاخص به  CAI=2تغییر می‌یابد.

کلیدواژه‌ها

سازند بهرام؛ اصفهان؛ کنودونت؛ زیست چینه نگاری؛ ژیوتین؛ فامنین

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