نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

ناحیه جلفای آذربایجان یکی از مهمترین مناطق شناخته شده در حاشیه جنوبی اقیانوس پالئوتتیس است که توالی رسوبی دریایی پیوسته‌ای از گذر پرمین به تریاس را در خود جای داده است. لایه‌های جلفای پایینی و بالایی در برش چینه‌شناسی قره‌گز (جنوب جلفا) با 5/41 متر ستبرا، با وجود آن که دربردارنده ردیف رسوبات کامل و غنی از سنگواره‌ای در این بازه زمانی می‌باشند، تاکنون کمتر مورد توجه قرار گرفته‌اند. پژوهش حاضر به مطالعه زیای بازوپایان لایه‌های جلفا در این منطقه می‌پردازد. در این مطالعه، 11 جنس و 21 گونه از راسته‌های Athyridida، Orthotetida، Orthida، Productida، Spiriferida و Terebratulida شناسایی شده‌اند که همگی معرف ایالت زیستی کاتایسین برای این ناحیه از پالئوتتیس باختری می‌باشند. بر این اساس، چهار زیست‌پهنه مختلف شامل ‌Araxilevis intermedius Zone، Araxilevis intermedius-Permophricodothyris ovata Interval zone، Permophricodothyris ovata Zone و Transcaucasathyris araxensis Zone معرفی شده‌اند که گویای سن ووچیاپینگین برای توالی مورد مطالعه می‌باشند. این زیست‌پهنه‌ها تطابق خوبی با دیگر برش‌های چینه‌شناسی ناحیه جلفا در کوههای علی‌باشی و زال، برش دورآشام در قفقاز جنوبی، سازند همبست در ناحیه آباده و سازند نسن در البرز مرکزی نشان می‌دهند و گویای اهمیت این بازوپایان در انجام تطابق زیستی در مقیاس منطقه‌ای در بازه زمانی پرمین پسین هستند.

کلیدواژه‌ها

موضوعات

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