نوع مقاله: مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
2 استاد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Trace fossils are abundant in the clastic succession throughout the Shirgesht Formation of Kalmard Block, Central Iran. At certain horizons there are beds full of Cruziana and Rusophycus. This study presents an evaluation of the arthropod ichnotaxa of the Cruziana and Rusophycus from the Ordovician succession Shirgesht Formation. Apart from the broad range in morphology and size, Cruziana from Shirgesht Formation show higher behavioral diversity using food sources than has ever been documented in a single section. It consists of a straight, or gently curved, ploughed furrow usually a few centimetres across, which is divided lengthwise into two lobes, each of which is braided transversely by a series of scratches. These vary in arrangement and profile according to ichnospecies. Overall characteristics of recognized ichnospecies suggest that with the exception of C. semiplicata, the ichnofaunas contain all the members of the Cruziana rugosa Group throughout the clastic successions in Shirgesht Formation. It consists of the five members of C. rugosa, C. furcifera, C. goldfussi C. rouaulti and C. yini. The Shirgesht Formation material therefore indicates that these arthropod ichnofossil assemblages are suitable for Cruziana ichnostratigraphy in Shirgesht Formation. Accordingly, the present assemblage could represent the Early to middle Ordovician age. The arthropod traces also, occur with other biogenic sedimentary structures in a fine to medium grained sandstone with minor mudstone interbeds of the Shirgesht Formation. The substrate composition and ichnological evidence places the arthropod ichnofossil-rich unit in the Cruziana ichnofacies.
کلیدواژه‌ها [English]
آقانباتی، ع.، 1383- زمین‌شناسی ایران، سازمان زمین‌شناسی و اکتشافات معدنی کشور، 586 ص.
بایت گل، آ. و حسینی برزی. م.، 1390- ژئوشیمی عناصر اصلی نهشتههای سیلیسی آواری سازند شیرگشت، بلوک کلمرد، ایران مرکزی جهت تعیین برخاستگاه زمین‌ساختی و هوازدگی سنگ منشأ. مجله علوم‌زمین. سال بیستم، شماره 81. ص 40-33.
بایت گل، آ.، 1388- محیط رسوبی، برخاستگاه و دیاژنز نهشتههای سازند شیرگشت در دو برش کوه عاشقان و کوه راهدار، طبس. پایان‌نامه کارشناسی ارشد، دانشگاه شهید بهشتی. 223 ص.
بایت گل، آ.، محبوبی، ا.، حسینی برزی، م. و موسوی حرمی، ر.، 1389- مدل ایکنولوژیکی نهشتههای آواری سازند شیرگشت در زیر پهنه کلمرد ایران مرکزی. مجله چینهنگاری و رسوب دانشگاه اصفهان. ص 43-68.
حسینی برزی، م. و بایت گل، آ.، 1389- تحلیل رخسارهای و محیط رسوبی نهشتههای سیلیسی آواری-کربناته سازند شیرگشت در بلوک کلمرد ایران مرکزی. رخسارههای رسوبی. جلد 2، شماره 1. ص 1-24.
قادری، ع.، آقانباتی، ع.، حمدی، ب. و سعیدی، ع.، 1386- زیست‌چینه‌نگاری سازند شیرگشت در کوه‌های کلمرد واقع در جنوب باختری طبس بر اساس کنودونتها. مجله علوم زمین. سال هجدم، شماره 70. ص 28-31.
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