نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران.

چکیده

چکیده
در مطالعه حاضر رسوبات بارمین در سازند گرو در یال جنوب غربی تاقدیس کبیرکوه (برش قلعه‌دره) از نقطه نظر نانوفسیل‌های آهکی مورد بررسی قرار گرفت. در رسوبات تحت بررسی سه حادثه نانوفسیلی شاخص ثبت شد و بر اساس آن‌ها بیوزون NC5 و قسمتهای ابتدایی بیوزونNC6 و زیرزون‌های NC5c، NC5d و NC5e از زوناسیون روث (Roth, 1978) و بیوزون‌های CC5 ، CC6 و CC7 از زوناسیون سیسینگ (Sissingh, 1977) تشخیص داده شد. در محدوده تحت بررسی جنس و گونه‌های شاخص آب گرم از قبیل Cyclogelosphaera margerelii، Diazmatolithus lehmanii، Lithraphidites carniolensis، Micrantholithus spp.، Nannoconus spp.، Rhagodiscus asper و Watznaueria spp. به موازات جنس و گونه‌های شاخص آب سرد از قبیل Biscutum constans، Helenea chiastia و Zeugrhabdotus embergeri حضور دارند. درصد فراوانی گونه‌های آب گرم بیش از گونه‌های آب سرد بوده و روند معکوس در فراوانی آن‌ها دیده می‌شود. بر اساس فراوانی جنس و گونه‌های شاخص آب گرم و سرد، سه فاز گرم‌شدگی و دو فاز سردشدگی در محدوده مورد مطالعه قابل ثبت است که شامل حادثه گرم‌شدگی قسمتهای ابتدایی بارمین پیشین، سردشدگی بارمین پیشین، گرم شدگی بارمین میانی، سرد شدگی بارمین پسین و گرم شدگی مرز بارمین-آپتین می‌باشد. لازم به ذکر است که این مطالب با داده‌های ثبت شده از سایر نقاط دنیا در حوضه‌های تتیس (از جمله ایتالیا) و بورآل (از جمله شمال‌غرب آلمان و شمال‌شرق انگلستان) همخوانی دارد.
کلید‌واژه‌ها: بارمین، بیوستراتیگرافی، پالئواکولوژی، سازند گرو، نانوفسیل‌های آهکی.

کلیدواژه‌ها

موضوعات

کتابنگاری
مطیعی، ه.، 1382- زمین‌شناسی ایران (چینه‌شناسی زاگرس)، طرح تدوین کتاب زمین‌شناسی ایران، انتشارات سازمان زمین‌شناسی و اکتشافات معدنی کشور، چاپ دوم، 583 ص.
 
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