سنگ‌نگاری، کانی شیمی و ژئوشیمی اتولیت‌ها و زینولیت‌های هورنبلندیتی گدازه‌های قلیایی شمال غرب مرند (شمال غرب ایران)

نویسندگان

1 دانشگاه تبریز

2 دانشگاه تولوز

چکیده

سنگ­های آتشفشانی قلیایی شمال­غرب مرند با سن پلیو-کواترنر در شمالی­ترین بخش منطقه آتشفشانی ارومیه-دختر قرار دارند. آنها غنی شدگی مشخصی در LILE و LREE و تهی­شدگی در HFSE (همانند Ta و Nb) نشان می­دهند و همچنین دارای نسبت­های بالای Ba/Ta و Ba/Nb هستند که از ویژگی­های مناطق فرورانش است. بیشتر اتولیت­ها و زینولیت­های هورنبلندیتی دیده شده در این مجموعه در بخش فوران­های تراکی آندزیتی و تراکی آندزیت بازالتی قرار دارند. این اتولیت­ها و زینولیت­ها بافت انباشتی نشان می­دهند و از لحاظ مقدار کانی پلاژیوکلاز به دو گروه تقسیم می­شوند. در گروه نخست مقدار پلاژیوکلاز کمتر از 10 درصد است و آمفیبول و بیوتیت کانی­های اصلی هستند. با در نظر گرفتن مقادیر عناصر سازگار نیکل و کروم، شکل روند REE و ترکیب عناصر اصلی کانی­ها، احتمال داده می­شود که ترکیب ماگمای تشکیل دهنده گروه 1 (اتولیت­های هورنبلندیتی) با سنگ­های آتشفشانی میزبان یکسان باشند. در گروه 2 مقدار پلاژیوکلاز بیشتر از 20 درصد است و آمفیبول، پلاژیوکلاز و بیوتیت کانی­های اصلی هستند. با در نظر گرفتن ترکیب عناصر اصلی کانی­ها، مقدار و شکل روند REE و مقادیر عناصر ناسازگار، احتمال داده می­شود، خاستگاه ماگمای گروه 2 (زینولیت­­­های هورنبلندیتی) گوشته دگرنهاده، با غنی شدگی کمتر نسبت به گروه 1 باشد.    

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, mineral chemistry and geochemistry of hornblenditic autholiths and hornblenditic xenoliths from volcanic alkaline rocks from North West of Marand (NW Iran)

نویسندگان [English]

  • AliAkbar Khezerlou 1
  • Nasir Amel 1
  • mohsen moayed 1
  • ahmad Jahangiri 1
  • mishel gari govayer 2
1 University of Tabriz
2 Toulouse University
چکیده [English]

Alkaline volcanic rocks of the northwest of Marand with Plio-Quaternary age are located in the northern part of Urumieh-Dokhtar Magmatic Arc. These rocks have a distinct enrichment in LILE and LREE and depletion in HFSE (such as Ta and Nb) and high Ba/Ta and Ba/Nb ratios, which are among the characteristics of subduction zones. The majority of hornblenditic autholiths and hornblenditic xenoliths are placed inside the trachy andesite rocks and the trachy basaltic andesite rocks. These autholiths and xenoliths, which have a cumulate texture, are classified into two groups based on the amount of plagioclase mineral. In Group 1, the amount of plagioclase is less than 10% and contains amphibole and biotite as the main minerals. Considering, contents of Cr and Ni, REE trend shape and the chemical composition of minerals, it seems that the origin of magma for group 1(hornblenditic autholiths) is the same as magma of host volcanic rocks. In Group 2, the amount of plagioclase is more than 20% and contains amphibole, plagioclase and biotite as the main minerals. The combination of minerals of group 2 are not similar to group 1. Considering, combination of minerals, REE trend shape and contents of REE and contents of incompatible trace elements, it seems that the magma of group 2 (hornblenditic xenoliths) is derived from the mantle metasomatized with less enriched than group 1.

کلیدواژه‌ها [English]

  • Trachy andesite
  • autholith
  • xenolith
  • Hornblendite
  • north west of Maran

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  • تاریخ دریافت: 11 تیر 1404
  • تاریخ بازنگری: 15 بهمن 1404
  • تاریخ پذیرش: 11 تیر 1404

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