Stratigraphy of the Upper Jurassic shallow marine carbonates of the Moghan area (NW Iran), with paleobiogeography implication on Alveosepta jaccardi (Schrodt, 1894)

Authors

1 Damghan University, School of Earth Sciences, 36716-41167 Damghan, Iran

2 National Iranian Oil Company Exploration Directorate, Sheikh Bahayi Square, 1994814695 Tehran, Iran

Abstract

A micropaleontological study has been carried out on the samples collected from the Sarv Abad section, the oldest and only known Jurassic sedimentary rocks cropping out in the Moghan area. Studied sequence consists of carbonates bounded at both base and top by clastic deposits. Studied carbonate deposits provide an assemblage of benthic foraminifera as well as calcareous algae. The stratigraphic distribution of the larger benthic foraminifera, particularly, almost consistent present of Alveosepta jaccardi allowed us to propose an age of Late Oxfordian to Early Kimmeridgian for the studied succession. At this time, Paratethys Basin was at very beginning of its opening. Larger benthic foraminifera and inhabited fauna at this basin are in close similarity with Tethyan Realm association. Data provided by larger foraminifera, calcareous algae, and microfacies analysis may suggest an environment of warm shallow water with low to medium energy regime

Keywords


Article Title [Persian]

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

Author [Persian]

  • مهدی صرفی 1
1 دانشگاه دامغان ،دانشکده علوم زمین 36716-41167، ایران
Abstract [Persian]

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.

Keywords [Persian]

  • پاراتتیس
  • مغان
  • ژوراسیک پایانی
  • فرامینیفرهای بنتیک بزرگ
  • آلوئوسپتا جاکاردای
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