زیست چینه نگاری نهشته¬های سازند کتکویه در برش دره آسیاب، شمال غرب کرمان (جنوب شرق زرند) براساس فونای کنودونتی
الموضوعات : Petroleum Geologyفیروزه بلاغتی 1 , علی بهرامی 2 , حسین وزیری مقدم 3 , حامد عامری 4 , مهدی یزدی 5 , گوستاو گابریل ولدمان 6
1 - گروه زمین شناسی دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - دانشگاهاصفهان
4 - دانشیار چینه نگاری و دیرینه شناسی، گروه اکولوژی، پژوهشکده علوم، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان، ایران
5 - استاد دانشگاه
6 - دانشیار چينه شناسي و فسيل شناسي، عضو هيات علمي مرکز تحقیقات علوم زمین، دانشگاه ملی کوردوبا، آرژانتین
الکلمات المفتاحية: اردویسین, سازند کتکویه, حوضه¬ی شمال غرب کرمان, برش دره آسیاب, کنودونت.,
ملخص المقالة :
در شمال کرمان، نهشته های اردویسین سازند کتکویه و معادل سازند شیرگشت از حدود 70 تا 300 متر از سنگ‌های سیلیسی آواری با چند میان لایه‌های کربناته نازک و افق های آذرآواری در بخش های بالایی تشکیل شده است. به منظور زیست چینه نگاری نهشته های سازند کتکویه در برش دره آسیاب، نمونه برداری سیستماتیک کنودونتها در حدود 12 کیلومتری جنوب شرق شهر زرند در برش دره آسیاب انجام شد. ضخامت نهشتههای اردویسین در این برش 4/154 متر و سازندکتکویه اساساً شامل شیلهای سیلتی، دیاباز، پیلولاوا، توفهای بازالتی، ماسه سنگ قرمز، مارل، سنگ آهک و سنگ آهک ماسهای میباشد. سازند کتکویه در این برش بر روی عضو دولومیت هتکن سازند کوه بنان قرار گرفته و خود در زیر تودههای آذرین سازند شبجره به سن سیلورین قرار دارد. با انجام مطالعات صحرایی و آزمایشگاهی در مجموع 680 عنصر کنودونتی به دست آمد که از مطالعه این عناصرکنودونتی، در مجموع 14جنس و 21 گونه از کنودونتها شناسایی گردید. بر اساس حضور گونههای شاخص کنودونتی، سه گستره کنودونتی در بخش کربناته از اردویسین پیشین تا اردویسین پسین برش مشخص گردید. با توجه به ضریب CAI حدود 5 برای عناصر کنودونتی بازیابی شده در این برش، منطقه دارای تاریخچهی حرارتی بالا بوده و وجود مواد هیدروکربنی در نهشتههای این ناحیه منتفی است.
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