چینه نگاری زیستی، ریز رخساره ها، محیط رسوبی و پالئواکولوژی سازند آسماری در جنوب غرب ایران و تطابق آن با دیگر نواحی زاگرس

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم پایه، دانشگاه فردوسی مشهد، مشهد

10.22084/psj.2019.19713.1215

چکیده

در این مطالعه به چینه نگاری زیستی، ریز رخساره ها، محیط رسوبی و پالئواکولوژی سازند آسماری در رخنمون های وزگ، اشگر و گرگدان در زون ایذه واقع در حوضه ی زاگرس در جنوب غرب ایران پرداخته شده است . بر اساس بافت، آنالیز پتروگرافی و فونا 8 رخساره با 18 زیر رخساره شناسایی گردید که در بخشهای متفاوت رمپ داخلی، رمپ میانی و رمپ خارجی ته نشین شده ا ند. همچنین بر اساس پخش و پراکندگی فرامینیفرهای بنتیک 6 زون تجمعی شناسایی شده که شامل: زون تجمعی I به سن روپلین زون تجمعیII به سن روپلین–شاتین ، زون تجمعیIIIبه سن شاتین ، زون تجمعی IV به سن آکی تانین ، زون تجمعی V به سن آکی تانین و زون تجمعیVI به سن بوردیگالین می باشند. بر این اساس سن رخنمون وزگ روپلین-بوردیگالین، اشگرشاتین-بوردیگالین و گرگدان روپلین- شاتین تا بوردیگالین می باشد. همچنین در توالی مورد مطالعه 2 زیر خانواده از جلبک های قرمز (non-geniculate) Lithophylloideae و Melobesioideae ،یک گونه (geniculate) از زیر خانواده(Subfamily Corallinoideae و یک گونه حد واسط و تکاملی بین non-geniculate و geniculate از زیر خانواده Corallinoideae? شامل Subterraniphyllum thomasii شناسایی شده است. پالئواکولوژی سازند آسماری بر اساس اجزای اصلی سازنده رسوبات کربناته(فرامینیفرهای بنتیک، جلبکهای قرمز و مرجان ها)، در برش های مورد مطالعه از شوری نرمال تا شوری زیاد، از نظر مواد غذایی یوتروفی تا الیگوتروفی و با غالب بودن شرایط الیگوتروفی تا مزوتروفی، شرایط نوری افوتیک تا یوفوتیک و از نظر عمق، از مناطق نسبتا عمیق تا کم عمق نهشته شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Biostratigraphy, Microfacies, Sedimentary environment and Paleoecology of the Asmari Formation in the south-western Iran and correlation of region with other sections at Zagros

نویسندگان [English]

  • M. Zare
  • M. Vahidinia
  • M. H. Mahmudy Garaie
چکیده [English]

In this research, the biostratigraphy, microfacies, sedimentary environment and paleoecology of Asmari formation were investigated in Vazag, Eshgar and Gorgdan outcrops in Izeh zone of Zagros basin of southwest of Iran. Based on their depositional textures, petrographic analysis, and fauna 8 facies and 18 subfacies, were distinguished. They indicate different depositional settings, inner ramp, middle ramp and outer ramp. Also, based on the distribution of larger benthic foraminifera, 6 assemblage zones were identified, including :assemblege zone I to the age of the Rupelian, the assemblege zone II in the age of the Rupelian-Chattian ,The assemblege zone III to the age of Chattian, the assemblage zone IV to the age of the Aquitanian, the assemblage zone of V in the age of the Aquitanian and assemblage zone VI Burdigalian age. In addition, in the studied areas it was identified two subfamilies of red algae non-geniculate Melobesioideae and Lithophylloideae ,Corallines genus of the red algae geniculate from subfamily Corallinoideae and Subterraniphyllum thomasii Elliott may be transitional species and evolutionary link between geniculate and nongeniculate coralline algae .paleoecology of Asmari Formation based on the main components of carbonate sedimentation (Benthonic foraminifera, coralline red algae and corals) in the studied sections salinity varied normal to highsalinity, Considering the nutritional status, the eutrophic and oligotrophic conditions, with conditions predominantly in oligotrophic to mesotrophic conditions, Light conditions aphotic to euphotic, and in terms of depth, it has been deposited from relatively deep to shallow areas.

کلیدواژه‌ها [English]

  • Asmari Formation
  • Biostratigraphy
  • microfacies
  • paleoecology
  • Benthic foraminifera
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