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تغییرات شوری توالی کربناته سازند آسماری بر اساس آنالیز رخسارههای رسوبی و روزنداران در شمال غرب زاگرس مرکزی | ||
| فصلنامه پژوهشهای چینه نگاری و فسیل شناختی | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 20 آبان 1394 | ||
| 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. | ||
| عنوان مقاله [English] | ||
| Salinity changes of Asmari Formation, Implication on sedimentary facies and benthic Foraminifera in N.W Central Zagros Basin | ||
| چکیده [English] | ||
| The salinity changes of Asmari Formation is based on the paleoenvironmental analysis of the depositional facies in the Ghale Nar Oilfield in the N.W central the Zagros fold-thrust belt. Salinity conditions are interpreted from analogy with the modern salinity gradient in Shark Bay, Western Australia, and the time scale is derived from foraminiferal biozonpaleoenvironmentation. The study demonstrates that frequent changes took place in the sedimentary facies and salinity conditions in the central Zagros Basin during the Chattian, Aquitanian, and Burdigalian. A transition took place from normal marine to hypersaline conditions following a significant shallowing from the middle ramp zone to the innermost part of inner ramp zone during the late Chattian. Episodes of severe hypersalinity (>70 psu) occurred in the Chattian- Aquitanian and Aquitanian -Burdigalian borders which is characterized by the presence of primary dolomite and anhydrite. | ||
| کلیدواژهها [English] | ||
| Benthic Foraminifera, Salinity changes, oligo- miocene | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 873 |
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