تغییرات شوری توالی کربناته سازند آسماری بر اساس آنالیز رخساره‌های رسوبی و روزن‌داران در شمال غرب زاگرس مرکزی

چکیده

در این مطالعه، آنالیز محیط دیرینه رخساره­های رسوبی مربوط به توالی الیگوسن (روپلین- شاتین)- میوسن (آکیتیانین- بوردیگالین) سازند آسماری در میدان نفتی قلعه نار در شمال غرب بخش مرکزی کمربند چین خورده و گسله زاگرس، جهت تفسیر تغییرات شوری مورد استفاده قرارگرفته است. شرایط شوری با مقایسه با گرادیان شوری امروزی در خلیج شارک استرالیای غربی و مقیاس زمانی مشتق شده از زیست چینه­نگاری روزن­داران تفسیر شده است. نتایج حاصل از این مطالعه نشان می­دهد که تغییرات مکرری در رخساره­های رسوبی و شرایط شوری در طی الیگوسن- میوسن در برش مورد مطالعه روی داده است. انتقال از شرایط دریایی عادی به شرایط هایپرسالین در طی شاتین و به دنبال آن کم عمق شدگی از بخش انتهایی رمپ میانی تا درونی­ترین قسمت رمپ داخلی صورت گرفته است. در زمان­های مرز شاتین- آکیتانین و آکیتانین- بوردیگالین، اغلب شرایط هایپرسالین شدید حاکم بوده است، به طوری که این دوره­های هایپرسالین شدید با حضور انیدریت و دولومیت اولیه مشخص می­شود.

کلیدواژه‌ها


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