زیست چینه نگاری نهشته¬های سازند کتکویه در برش دره آسیاب، شمال غرب کرمان (جنوب شرق زرند) براساس فونای کنودونتی
محورهای موضوعی : زمین شناسی نفتفیروزه 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
کلید واژه: اردویسین, سازند کتکویه, حوضه¬ی شمال غرب کرمان, برش دره آسیاب, کنودونت.,
چکیده مقاله :
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.
Ordovician marine sedimentary sequences occur in several structural blocks widely in Iran, along the northern margin of Gondwana. In north Kerman province, the Ordovician deposits are known as the Katkoyeh Formation, which includes 70 to 300 meters of siliciclastic rocks with rare and thick pyroclastic carbonate layers in its upper part. In order to better percise biostratigraphy of the Katkoyeh Formation in Kerman region, systematic sampling for conodonts was carried out in Asyab-valley section, located about 12 km southeast of Zarand city, the thickness of Ordovician deposits in the studied section is 154/4 meters. The Ordovician deposits of Katkoyeh Formation in the studied section includes silty shales, diabase, pilolava, basaltic tuffs, red sandstone, marl, limestone and sandy limestone. After sampling and recovery of conodonts, a total of nearly 680 conodont elements were obtained from the studied samples, a total of 14 genera and 21 species of conodonts were discriminated. Based on the occurrence of biostratigraphically important species, three conodont ranges have been recorded. These three biozones are:
1) Rossodus manitouensis/Paltodus deltifer Concurrent Range Zone (the lowest part of Late Tremadocine; Early Ordovician)
2) Juanognathus variabilis Range Zone (Fluvian; Early Ordovician)
3) Icriodella superba Range Zone (Katian - ? Hirnantian; Late Ordovician)
Considering the CAI (5) of recovered conodont elements, the region has a high thermal history and the presence of hydrocarbon materials in the deposits of this area is ruled out.
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