ماهیت ژئوشیمیایی سرپانتینیت های مجموعه اولترامافیک- مافیک مشهد شاهدی بر فرورانش پوسته اقیانوسی پالئوتتیس در شمال خاور ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران، سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران

2 استاد، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

3 استاد، انستیتو علوم زمین و محیط زیست، دانشگاه پتسدام، پتسدام، آلمان

4 دانشیار، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

چکیده

مجموعه سنگ‌های اولترامافیک مشهد به سن چینه‌شناسی پرمین - تریاس در شمال خاور کوه‌های بینالود و در نزدیکی شهر مشهد قرار گرفته است. واحدهای سنگی این منطقه شامل سنگ‌های اولترامافیک و  مافیک، سنگ‌های رسی و کربناته دگرگون شده، گرانیتویید و فیلیت‌های مشهد با راستای عمومی شمال باختر ـ جنوب خاور می‌باشد. پریدوتیت‌های سرپانتینی شده، بیشترین سنگ‌های اولترامافیک در منطقه مورد مطالعه را تشکیل می‌دهند. کانی‌های تشکیل دهنده سنگ‌های اولترامافیک این منطقه شامل الیوین، ارتوپیروکسن، کلینوپیروکسن، آمفیبول قهوه‌ای و کانی‌های تیره به عنوان کانی‌های باقیمانده از سنگ اولیه و کانی‌های گروه سرپانتین (لیزاردیت و آنتیگوریت)، ترمولیت- اکتینولیت، کلریت، مقادیر اندکی تالک و کانی‌های کربناتی به عنوان کانی‌های تشکیل شده بعدی  هستند. به‌رغم نبود سنگ‌های دگرگونی فشار بالا- دما پایین که معرف پدیده فرورانش هستند، شیمی عناصر اصلی، کمیاب و فرعی سرپانتینیت‌های مشهد، ویژگی‌های سرپانتینیت‌های فرورانده شده را نشان می‌دهند و منشأ پریدوتیت اولیه تشکیل دهنده آنها گوشته تهی نشده‌ای است که به صورت لرزولیت و یا هارزبورژیت فقیر ازالیوین می‌باشد. پروتولیت این سنگ ها قبل از سرپانتینی شدن تحت تأثیر مذاب حاصل از فرورانش قرار گرفته و متاسوماتیزه و بارور شده است.  

کلیدواژه‌ها


عنوان مقاله [English]

The geochemical nature of serpentinites from the Mashhad mafic-ultramafic complex as an evidence for Palaeotethys oceanic crust subduction in NE Iran

نویسندگان [English]

  • K. Mohammadiha 1
  • M. Moazzen 2
  • U. Altenberger 3
  • R. Hajialioghli 4
1 Ph.D. Student, Department of Earth Science, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran; Geological Survey of Iran, Tehran, Iran
2 Professor, Department of Earth Science, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
3 Professor, Institute for Earth and Environment Sciences, Potsdam University, Potsdam, Germany
4 Associate Professor, Department of Earth Science, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
چکیده [English]

The Mashhad ultramafic complex with a Permo-Triassic stratigraphic age is exposed at the NE of Binaloud Mountain and at the vicinity of the Mashhad city. This area is mainly composed of mafic and ultramafic rocks, metamorphosed carbonate and pelitic rocks and granitoids with a NW- SE trend. Serpentinized peridotites are the main types of ultramafic rocks in this area. Minerals in these rocks include olivine, orthopyroxene, clinopyroxene, brown amphibole and opaque minerals as the original minerals and serpentinite group minerals (lizardite and antigorite), tremolite-actinolite, chlorite, talc and carbonate minerals are the secondary minerals. High pressure-low temperature metamorphic rocks, which are indicative of subduction are not present in this area, but according to the major, minor and rare earth elements chemistry of the Mashhad serpentinites, these rocks show subducted serpentinites features, with a peridotite protolith derived from lherzolite or olivine-poor harzburgite. The protolith of these rocks metasomatized and refertilized by melt formed in a subduction zone before serpentinization.

کلیدواژه‌ها [English]

  • Metaperidotite
  • Subducted serpentinite
  • Metasomatic mantle
  • Subduction
  • Palaeotethys
  • Mashhad ultramafic complex

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