زيست چينه نگاري، زيست رخساره¬هاي کنودونتي و انديس تغيير رنگ (CAI) کنودونت ها در نهشته هاي دونين بالايي-کربنيفر در برش انارک، ايران مرکزي
محورهای موضوعی : زمین شناسی نفتالهه ستاری 1 , علی بهرامی 2 , حسین وزیری مقدم 3 , علی طاهری 4 , ساندرا ايزابلا کايسر 5 , پیتر کونيگشوف 6
1 - دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - دانشگاهاصفهان
4 - دانشگاه اصفهان
5 - موزه تاریخ طبیعی اشتو تگارت
6 - موسسه پژوهشی وتاریخ طبیعی
کلید واژه: دونين کربنيفر برش انارک زيست¬, زون¬, هاي کنودونتي ريز رخساره کنودونتي.,
چکیده مقاله :
بررسي فوناي کنودونتي نهشته هاي دونين پسين-کربونيفر (مي مي سي سي پين-پنسيلوانين) سازند هاي بهرام، شيشتو و قلعه (سردر1) در برش انارک (کوهبند عبدالحسين) در شمال شرقي اصفهان، واقع در زون ايران مرکزي، منجر به شناسايي تعداد 67 گونه از 18 جنس کنودونتي شد و بر همين اساس تعداد 22 زون زيستي کنودونتي تفکيک گرديد؛ که از اين تعداد 15 عدد مربوط به دونين پسين (1 زيست زون مربوط به فرازنين، 14 زيست زون مربوط به فامنين) و 7 زيست زون مربوط به کربنيفر (مي مي سي سي پين - پنسيلوانين) مي باشد. مرزهاي زيستي فرازنين / فامنين، دونين / کربونيفر، مي مي سي سي پين / پنسيلوانين بر همين اساس تشخيص داده شد. با بررسي هاي صحرايي در برش مذکور تعداد 5 واحد سنگ چينه اي تفکيک شد. انطباق منحني هاي تغييرات سطح آب بر اساس زيست رخساره هاي کنودونتي با منحني تغييرات سطح آب جهاني حاکي از تطابق نسبی در زمان هاي مذکور دارد که علت آن کم عمق بودن حوضه ايران مرکزي نسبت به حوضه اروپا و آمريکاست. عناصر کنودونتی در زيست زون های فرازنين تيره CAI=4 (11-a)، در فامنين رنگ روشن CAI= 1.5-2 (11-b,c) و در کربنيفر مجدداً رنگ تيره CAI= 5-5.5 (11-d,e) را نشان مي دهند که این تغییرات اندیس رنگ حاکی از بلوغ بافتی و احتمال حضور هیدروکربور در فامنین نسبت به فرازنین و کربنیفر می باشد.
چکیده انگلیسی:
Study of Late Devonian-Carboniferous (Mississippian-Pennsylvanian) conodonts Anarak section (NE Isfahan), Central Iran, led to identifying 67 conodont species belonging to 18 genera. 22 conodont bio-intervals were separated; 15 biozones belong to Late Devonian and 7 biozones belong to carboniferous (Mississippian-Pennsylvanian) time interval. Based on field observation and sedimentological featurs and charactristics the section, subdivided into 5 lithostratigrafic unit. The Color Alteration Index (CAI) reveals the hydrocarbure potential for the Famennian stage of the studied interval
منابع و مأخذ:
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