پتروگرافی و ژئوشیمی ماسه‌سنگ‌های سازند سرخ بالایی در برش منطقه حسن‌آباد (جنوب‌غرب تهران)

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشگاه خوارزمی، دانشکده علوم زمین، گروه زمین شناسی

چکیده

تلفیق مطالعات پتروگرافی و داده­های ژئوشیمیایی سنگ­های رسوبی می­تواند ماهیت ناحیه منشاء، موقعیت تکتونیکی حوضه­های رسوبی و شرایط اقلیم قدیمه را آشکار نماید. با این هدف سازند آواری سرخ بالایی به سن الیگوسن با رخنمونی به ضخامت 220 متر در منطقه جنوب حسن­آباد تهران مورد مطالعه قرار گرفت. با استفاده از مطالعه مقاطع نازک، دانه‌ شماری و آنالیز ژئوشیمیایی عناصر اصلی و فرعی به بررسی دقیق این توالی پرداخته شد. برش مورد مطالعه از توالی مارن‌های با رنگ روشن و ماسه‌سنگ‌های لیت‌آرنایتی تشکیل شده است. شواهد دانه‌شماری ولکانیک‌‌لیت‌آرنایت بودن اغلب این ماسه‌سنگ‌ها را تثبیت کرد. بر اساس نتایج حاصل از تفسیر داده‌های ژئوشیمیایی، سنگ منشا فلسیک تا حدواسط با ترکیب مشابه پوسته قاره‌ای، در چرخه اول رسوب­گذاری با جایگاه زمین­ساختی حواشی فعال قاره­ای، دارای با توپوگرافی مرتفع و اقلیم گرم و خشک برای این ماسه‌سنگ‌ها پیشنهاد می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Petrography and Geochemistry of Sandstone of Upper Red Formation in Hasan-Abad area-SW Tehran

نویسندگان [English]

  • Khalil Rezaei
  • Sh Forooghi
  • Ahmad Asadi
چکیده [English]

The combination of petrography and geochemistry data of sedimentary rocks can reveal the nature of source regions, the tectonic setting of sedimentary basins, and paleo-climate conditions. With this goal, the Oligocene Upper Red Formation clastic rocks with a thickness of 220 m outcrop in the southern region of Hasan Abad- Tehran were studied. Using thin sections and point counting of minerals and components and geochemical analysis of major and minor elements, the sequence were carefully investigated. This section is composed of repeating sequence of bright color Marl and Litharenite sandstone. Grain counts and geochemical evidence proved that most of these sandstones are volcanic-arenite. Maturity and sedimentary cycle index of these rock is equal to 1.722, which indicates the formation of deposits in the first cycle of sedimentation in active tectonic setting with relatively low maturity. Also, based on the results of the interpretation of geochemical data, felsic to intermediate source rock with a composition similar to continental crust is suggested for sandstone.

کلیدواژه‌ها [English]

  • Upper Red Formation
  • Geochemistry
  • Sandstone
  • Petrography
  • Hasan Abad

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