ژئوشیمی و پتروژنز توالی آتشفشانی منطقه ارزوییه (جنوب ایران)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران.

2 پژوهشکده علوم زمین، سازمان زمین‌شناسی و اکتشافات معدنی کشور، تهران. ایران.

چکیده

توالی آتشفشانی منطقه ارزوییه با سن ژوراسیک بالایی- کرتاسه زیرین در پهنه ساختاری سنندج-  سیرجان جنوبی قرار گرفته است. ژئوشیمی عناصر اصلی و کمیاب، تحولات ماگمایی را از گرایش تحولی به سمت کلسیمی- قلیایی نشان می‌دهند. ترکیب شیمیایی کلینوپیروکسن‌ها مشابه با ترکیب این کانی در مناطق فرورانش است و از یک ناحیه مرتبط با کمان آتشفشانی منشأ گرفته است. نمودارهای عناصر کمیاب و خاکی  کمیاب الگوهای غنی‌شدگی را در  LREEها نسبت به HREEها و تهی‌شدگی را در عناصر Nb  و Ta نشان می‌دهند. این توالی ماگمایی از یک منشأ گوشته‌ای با تأثیر سیال‌ها و رسوبات حاصل از ورقه فرورانش تشکیل یافته است. توالی آتشفشانی منطقه ارزوییه احتمالا" در نتیجه فرورانش سنگ‌کره اقیانوس نئوتتیس به زیر پهنه سنندج- سیرجان، از زمان ژوراسیک بالایی تا کرتاسه زیرین، در محیط کمان آتشفشانی تشکیل یافته‌اند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Geochemistry and Petrogenesis of the Orzuieh Volcanic Sequence (South of Iran)

نویسندگان [English]

  • I. Monsef 1
  • M. Rahgoshay 1
  • M. H. Emami 2
1 Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
چکیده [English]

The Late Jurassic to Early Cretaceous Orzuieh volcanic sequence is exposed in the southern part of the Sanandaj – Sirjan Zone. Major and trace element geochemistry shows magma evolution from the transitional to the calc-alkaline series. Clinopyroxene compositions are similar to their composition in subduction setting and support a volcanic arc related environment. REE and trace element diagrams show enrichment patterns in LREE relative to HREE and depletion in Nb and Ta elements. This magmatic sequence has been originated from the mantle source with effect of liquids and sediment resulted from the subducting slab. The Orzuieh volcanic sequence is probably originated during the subduction of the Neo-Tethyan Oceanic lithosphere under the Sanandaj – Sirjan Zone, during the Late Jurassic to Early Cretaceous time, in the volcanic arc tectonic environment.

کلیدواژه‌ها [English]

  • Volcanic rocks
  • Volcanic arc
  • Neo-Tethys
  • Sanandaj – Sirjan Zone
  • Orzuieh
  • South Iran
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