اولین گزارش مجموعه کریپتواسپورهای اُردویسین پسین ایران از سازند قِلّی، البرز شرقی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکده علوم زمین، سازمان زمین شنای و اکتشافات معدنی کشو، تهران، ایران

2 دانشگاه فردوسی مشهد، پردیس بین الملل

3 آزمایشگاه محیط و دیرینه مغناطیس، سازمان زمین شناسی و اکتشافات معدنی، تهران، ایران

4 پژوهشکده علوم زمین، سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران

چکیده

در این مطالعه برای نخستین‌بار در ایران، یک مجموعه کریپتواسپوری مشتمل بر 9 جنس و 11 گونه از طبقات اردویسین بالایی شناسایی و رده‌بندی شد. این مجموعه کریپتواسپوری از رأس سازند غیر رسمی اَبَرسَج (هم ارز سازند رسمی قِلّی) از رشته کوه‌های البرز شرقی به دست آمد. کریپتواسپور‌های پیرامون گندوانایی از نظر ریختاری (موناد، دیاد واقعی، دیاد دروغین، تتراد‌های متصل و سست) رده‌بندی شدند. نتایج مطالعه حاضر مؤید این نظریه در مطالعات قبلی می‌باشد که هیچ تفاوت اساسی بین مجموعه کریپتواسپوری پیرامون حوزه‌های گندوانایی، بالتیک و سایر نقاط جهان به صورت هم زمان، وجود نداشته است. حضور کیتینوزوآی شاخص گندوانای شمالی هم‌چون Spinachituna oulebsiri، اکریتارک‌های شاخص و کریپتواسپور‌های شناسایی شده توسط ما، برای رأس سازند اَبَرسَج، سن هیرنانتین پسین (اردویسین پسین) را پیشنهاد می‌کند.

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