زیست چینه نگاری نهشته¬های سازند کتکویه در برش گزوئیه، شمال غرب کرمان (جنوب شرق زرند) براساس فونای کنودونتی
محورهای موضوعی : چینه شناسی
فرزاد پورصالحی
1
(دکتری چينه شناسي و فسيل شناسي، گروه زمين شناسي، دانشگاه اصفهان، اصفهان، ايران)
علی بهرامی
2
(دانشيار چينه شناسي و فسيل شناسي، عضو هيات علمي گروه زمين شناسي، دانشگاه اصفهان، اصفهان، ايران)
حامد عامری
3
(دانشیار گروه اکولوژی، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، )
گوستاو گابریل ولدمان
4
(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 گزوئیه, کنودونت,
چکیده مقاله :
چکيده توالی‌های رسوبی دریایی اردویسین ایران در بلوک های ساختاری متفاوتی در امتداد حاشیه شمالی گندوانا قرار دارند. در شمال حوضه کرمان، توالی های رسوبی اردویسین به نام سازند کتکویه معرفی گردیده اند که مشتمل بر70 تا 300 متر از سنگ‌های سیلیسی آواری، یک یا دو افق نازک کربناته در بخش بالایی و نهشته های آذرآواری می باشند. به طور سنتی مرز کامبرین-اردویسین در حوضه کرمان بین عضو دولومیت هتکن از سازند کوهبنان (فورونگین پسین) و عضو شیل پایینی سازند کتکویه تعیین شده است. با این وجود، تعیین جایگاه مرز ترمادوسین پیشین به دلیل اینکه هیچ فسیل شاخصی به طور مستند از این فاصله¬ی زمانی گزارش نگردیده نامشخص می¬باشد. به منظور زیست چینه نگاری سازند کتکویه در حوضه کرمان، برش گزوئیه با ضخامت تقریبی حدود170 متر انتخاب گردید. سازند کتکویه در این برش بر روی عضو دولومیت هتکن و در زیر ماسه سنگ های سازند شبجره به سن سیلورین قرارگرفته است. در برش گزوئیه به دلیل عملکرد دایک¬های بازالتی و تکتونیک شدید منطقه، لایه¬های سنگ آهک حاوی فسیل به شدت آلتره شده¬اند که طی سه مرحله برداشت نمونه، در نهایت 320 کنودونت از افق کربناته بخش بالایی این سازند بازیابی شد و 3 جنس و 7 گونه شناسایی گردید و بر این اساس سه¬ گستره ¬کنودونتی ¬ثبت¬شد: 1) Icriodella superba Range Zone(کاتین - ؟ هیرنانتین ؛ اردویسین پسین)، 2) Amorphognathus ordovicicus Range Zone (کاتین – اردویسین پسین)، 3) Amorphognathus superbus Range Zone (کاتین - ؟ هیرنانتین؛ اردویسین ¬پسین). سن اردویسین ¬پسین در سازند کتکویه در برش گزوئیه حداقل با سه گونه از جنس¬کنودونت Icriodella (I. superba ، I. deflecta، (I. cf. discrete و دوگونه¬ از جنس A. superbus) Amorphognathus،A. ordovicicus) مشخص و منجر به شناسایی آشکوب¬های Katian-?Hirnantian گردید.
The Ordovician marine sedimentary sequences of Iran are located in different structural blocks along the northern margin of Gondwana. In the north of the Kerman Basin, Ordovician sedimentary sequences named Katkoyeh Formation have been introduced, which consist of 70 to 300 meters of siliceous siliceous rocks, one or two thin carbonate horizons in the upper part, and pyroclastic deposits. Traditionally, the Cambrian-Ordovician boundary in the Kerman Basin has been determined between the Hatken Dolomite Member of the Kuhbanan Formation (Late Furongian) and the Lower Shale Member of the Katkuye Formation. However, determining the location of the previous Tremadocine boundary is uncertain because no fossils have been documented from this interval. For the purpose of biostratigraphy of the Katkuye formation in Kerman basin, Gezoye section with an approximate thickness of about 170 meters was selected. In this section, the Katkoyeh Formation is located on the Hatken Dolomite Member and under the Shabjareh Formation sandstones of Silurian age. In the Gezoiye section, due to the action of basalt dikes and intense tectonics in the region, the limestone layers containing fossils have been severely altered, and during three sampling stages, 320 conodonts were recovered from the carbonate horizon of the upper part of this formation, and 3 Genus and 7 species were identified and based on this, three conodont ranges were recorded: 1) Icriodella superba Range Zone (Katian - ? Hirnantian; Late Ordovician), 2) Amorphognathus ordovicicus Range Zone (Katian - Late Ordovician), 3) Amorphognathus superbus Range Zone (Katian - ? Hirnantian; Late Ordovician). Late Ordovician age in the Katkuye formation in the Gezoye section with at least three species of the conodont genus Icriodella (I. superba, I. deflecta, (I. cf. discrete and two species of A. superbus) Amorphognathus, A. ordovicicus) determined and led to the identification of the Katian-?Hirnantian rocks.
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