چینه شناسی واحدهای کربناته کم عمق ژوراسیک درمنطقه مغان (شمال غرب ایران) با تکیه برپالئوبیوژئوگرافی گونه آلوئوسپتا جاکاردای (شرودت، 1893)

نویسنده

دانشگاه دامغان ،دانشکده علوم زمین 36716-41167، ایران

چکیده

در این مطالعه ریز دیرینه شناسی نمونه های جمع آوری شده از رخنمون سرواباد به عنوان تنها رخنمون شناخته شده از رسوبات ژوراسیک ناحیه مغان که از همین روی قدیمی ترین واحد سنگی این منطقه است مورد مطالعه و بررسی قرار گرفته است. رسوبات کربناته مورد مطالعه در قاعده و راس توسط رسوبات تخریبی پوشیده شده است.این رسوبات مجموعه نسبتا غنی از فرامینیفرهای بنتیک بزرگ و جلبک های آهکی را در برداشته و با استفاده از گسترش چینه شناسی نمونه های مذکور و خصوصا گونه آلوئوسپتا جاکاردای سن آکسفوردین پسین و کیمیریجین پیشین برای این رسوبات پیشنهاد گردیده است. در این زمان پاراتتیس در اولین مراحل توسعه قرار داشته و فونای به دست آمده از این مطالعه شباهت زیادی با فونای مناطق همجوار در تتیس نشان می دهد. نتایج به دست امده از میکروفسیل ها و مطالعات میکروفاسیس محیط رسوبی گرم و کم عمق با شرایط انرژی دیرینه کم تا متوسط را نشان می دهد.

کلیدواژه‌ها


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