برخاستگاه شیل های سازند کشف رود در برش ناویا (باختر بجنورد) بر پایه داده های ژئوشیمیایی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی، مشهد، ایران

2 استاد، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی، مشهد، ایران

3 استادیار، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی، مشهد، ایران

چکیده

حوضه رسوبی کپه‌داغ، پس از بسته شدن اقیانوس پالئوتتیس، در جنوب صفحه توران تشکیل شد.سازند کشف‎رود در برش ناویا (باختر بجنورد) با ستبرای 749 متر از سنگ‎های  سیلیسی آواری (کنگلومرا، ماسه‌سنگ و شیل) تشکیل شده است. به­منظور تفسیر برخاستگاه سازند کشف‎رود در برش مورد مطالعه، شیل­های این سازند تجزیه ژئوشیمیایی شدند. این شیل­ها غنی از کوارتز و کانی رسی (ایلیت و کلریت) هستند و نسبت به پوسته قاره­ای بالایی (UCC)، تخلیه در میزان Na2O، CaO، MgO، Cu، Nb، و  Srو غنی‎شدگی در Ni، U، Y، V و Co را نشان می­دهند. با رسم نمودارهای Al2O3 در برابر TiO2، TiO2 در برابر Zr و نمودارهای سه­تایی (SiO2/20), (K2O+Na2O), (MgO+TiO2+FeO) و Al2O3, (CaO + Na2O + K2O), (FeO + MgO) یک سنگ منشا آذرین حد واسط برای شیل­های این سازند پیشنهاد می­شود. CIA و PIA محاسبه شده بیانگر هوازدگی شیمیایی شدید و آب‎و‎هوای گرم و نیمه‎مرطوب در ناحیه منشأ است. نمودارهای تابعی با استفاده از اکسید­های عناصر اصلی و SiO2 در برابر K2O/Na2O و همچنین نمودار سه‌تایی ((Na2O+ K2O), (TiO2+ MgO+ Fe2O3  (SiO2/20),شیل­های این سازند بیشتر در جایگاه قاره­ای غیر فعال قرار می­گیرند. بازسازی جغرافیای دیرینه برای این سازند در طی ژوراسیک میانی نشان می­دهد ­که رسوب­گذاری این سازند در یک حوضه درون قاره­ای بزرگ که در حال فرونشینی بوده کنترل شده است و منشأ این رسوبات از سوی جنوب خاور حوضه کپه‎داغ بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Provenance of shales of the Kashafrud Formation in the Navia section (West of Bojnourd), based on geochemical data

نویسندگان [English]

  • N. Sarbaz 1
  • A. Mahboubi 2
  • R. Moussavi-Harami 2
  • M. Khanehbad 3
1 M.Sc. Student, Department of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
2 Professor, , Department of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
3 Assistant Professor , Department of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
چکیده [English]

The Koppeh- Dagh Basin in the northeast Iran formed after closure of the Paleotethys in the south of Turan plate. Kashafrud Formation in the Navia Section (west of Bojnourd) with a thickness of 749 m is composed of silici-clastic rocks (conglomerate, sandstone and shale). In order to interpret provenance of this formation in the study section, 12 shale samples have been geochemically analyzed. ­The  samples are rich in quartz and clay minerals, with respect to (UCC) depletion in Na2O, CaO, MgO, Cu, Nb and Sr and enrichment in Ni, Co, V, Y and U.­ Plotting TiO2 versus Al2O3, Zr versus TiO2, as well as ternary diagram (SiO2/20), (k2O+ Na2O), (MgO+ TiO2+ FeO) and diagram Al2O3, (Cao+ Na2O+ K2O), (FeO + MgO) suggest that the original source of this formation was probably from intermediate igneous rocks. Calculated PIA and CIA indicate high chemical weathering and semi- humid climatic condition in the source area. Prepared discrimation diagram using the major oxides (SiO2 versus K2O/Na2O and ternary diagrams SiO2/20, Na2O+ K2O, TiO2+ MgO+ Fe2O3), shows that the shales of this formation were plotted in the passive continental margin.  Paleogeographic reconstruction for this formation, during the Middle Jurassic shows that sedimentation of this formation is mainly controlled by intracontinental subsiding basin and the source of these sediments was from the southeast of the Kopph-Dagh Basin.
 

کلیدواژه‌ها [English]

  • Geochemistry
  • Source rock
  • Tectonic setting
  • Paleoweathering
  • Kashafrud Formation

آقا­نباتی، س. ع.، 1383- زمین­شناسی ایران، سازمان زمین­شناسی و اکتشافات­معدنی کشور، شماره1، 586 ص.

پورتقوی، ا. ن.، پورکرمانی، م.، قرابیگلی، غ. ر. و شرکتی، ش.، 1390- الگوی چین­خوردگی در بخش باختری کمربند چین­خورده کپه­داغ (شمال خاور ایران)، علوم زمین، شماره 91، صص. 153 تا 160.

رئوفیان، ا.، 1393- بررسی ردیف های رسوبی ژوراسیک میانی تا بالائی در حوضه­ی ساختاری- رسوبی بینالود بر مبنای مطالعات چینه­شناسی، فسیل­شناسی (زیای­آمونیتی) و محیط­رسوبی، پایان‌نامه دکترا، گروه زمین­شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، 419 ص.

سرباز، ن.، محبوبی، ا.، موسوی حرمی، ر. و خانه باد، م.، 1394- برخاستگاه ماسه‎سنگ­های سازند کشف‏رود (ژوراسیک میانی­) در برش ناویا (غرب بجنورد)، سی و چهارمین گرد­همایی و دومین کنگره بین‎المللیتخصصی علوم زمین.

سهیلی، م. و سهندی، م.، 1375- نقشه زمین­شناسی سنخواست به مقیاس 1:100000،­ سازمان زمین­شناسی و اکتشافات معدنی کشور.

 

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