محیط رسوبی و برخاستگاه ماسه‌سنگ های سازند آب حاجی در برش‌های چشمه بخشی و سرتخت شتران، بلوک کلمرد، ایران مرکزی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده علوم زمین، دانشگاه شهید بهشتی تهران، تهران، ایران

چکیده

در این مطالعه به بررسی محیط رسوبی، برخاستگاه و جایگاه زمین­ساختی ماسه‌سنگ‌های سازند آب­حاجی (ژوراسیک پیشین) در برش‌های چشمه­بخشی و سرتخت­شتران، واقع در بلوک کلمرد پرداخته شده است. تجزیه و تحلیل رخساره‌های رسوبی در این برش‌ها حاکی از وجود سه مجموعه رخساره­ای آواری شامل: رخساره‌های دشت دلتایی، رخساره‌های جلوی دلتا و رخساره‌های انتهای دلتا و نیز دو رخساره کربناته مرتبط با سد است. نتایج حاصل از تجزیه مدال و داده‌های ژئوشیمیایی به برخاستگاه زمین‌ساختی کراتون و چرخه مجدد و سنگ مادر رسوبی کوارتزی (حاصل چرخه مجدد رسوبی) اشاره دارند. همچنین استفاده از نمودارهای تفکیکی جایگاه زمین‌ساختی حاشیه غیرفعال قاره­ای را برای ماسه سنگ‌های آب حاجی نشان می‌دهد. شاخص‌های شیمیایی دگرسانی(آلتراسیون) (CIA) و دگرسانی پلاژیوکلاز (PIA) محاسبه شده، میزان هوازدگی در منطقه منشأ را متوسط تا شدید معرفی می‌کند. این امر با نتایج سنگ نگاری و تجزیه مدال ماسه‌سنگ­ها مبنی بر وجود شرایط آب و هوای مرطوب تا نیمه مرطوب همخوانی دارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Sedimentary Environment and Provenance of Ab-Haji Sandstones in Cheshmeh Bakhshi and Sartakht-e-Shotoran Sections, Kalmard Block, Central Iran

نویسندگان [English]

  • A. M. Ali Khasi
  • M. Hosseini Barzi
  • M. Shadan
Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Determination of sedimentary environment, provenance and tectonic setting of Ab-Haji Formation sandstones (Lower Jurassic) have been carried out in Cheshmeh Bakhshi and Sartakht-e-Shotoran sections which are located in Kalmard Block. Facies analysis of sedimentary facies in mentioned sections implies three clastic faceis associations including delta plain, delta front and prodelta and two carbonate facies, relevant to bar. The obtained results from modal analysis and geochemical data point to cratonic tectonic setting and presence of qurtzose rocks in the source area in the course of recycling processes. Moereover, using the tectonic discrimination diagrams suggest that Ab-Haji sandstones have been deposited in a passive continental margin. The calculated chemical index of alteration (CIA) and the plagioclase index of alteration (PIA), based on major element oxides, denote moderate to intense weathering in the hinterland. This consequence is conformed with the modal analysis and petrographic evidence referring to humid and semi-humid climate.

کلیدواژه‌ها [English]

  • Sedimentary Environment
  • Provenance
  • Geochemistry
  • Ab-Haji Formation
  • Kalmard Block
 
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