سنگ‌زایی سنگ‌های قلیایی جنوب املش در جنوب دریای خزر، شمال ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

2 دانشکده زمین شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

3 گروه زمین‌شناسی، دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان، ایران

چکیده

سنگ‌های قلیایی جنوب شهرستان املش، استان گیلان، به صورت توده‌های کوچک و پراکنده در داخل مجموعه سنگ‌های منسوب به کرتاسه در جنوب دریای خزر قرار دارند و  از لحاظ تقسیمات زمین­شناسی ایران در زون گرگان- رشت واقع شده‌اند. این گروه از سنگ‌ها شامل حجم بزرگی از بازالت‌هایی با ریخت‌شناسی بالشی و گابروهای ریز تا درشت دانه‌ همگن هستند. کانی‌های اصلی سنگ‌های قلیایی شامل کلینوپیروکسن (نوع اوژیت)، پلاژیوکلاز و سوزن‌های کوچک آپاتیت هستند. سنگ‌های قلیایی آشکارا از LREE غنی‌شدگی نشان می­دهند و بی‌هنجاری مثبت Nb و Ti دارند و از لحاظ ژئوشیمیایی ویژگی‌های سنگ‌های ماگمایی با منشأ درون صفحه­ای نوع جزایر اقیانوسی (OIB) را عرضه می­کنند. با توجه به نسبت LREE/HREE و نسبت عناصر ناسازگار به نظر می­رسد که این سنگ‌های قلیایی از یک گوشته گارنت لرزولیتی منشأ گرفته‌اند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Petrogenesis of Southern Amlash Alkaline Rocks in the South Caspian Sea, North of Iran

نویسندگان [English]

  • F. Zaeimnia 1
  • A. Kananian 2
  • M. Salavaty 3
1 Faculty of Geology, College of Science, Tehran University, Tehran, Iran
2 Faculty of Geology, College of Science, Tehran University, Tehran, Iran
3 Department of Geology, Islamic Azad University, Lahijan Branch, Lahijan, Iran
چکیده [English]

South Amlash alkaline rocks, located in south of Caspian Sea, occur like small and discrete bodies within the Cretaceous igneous rock association which is a small part of Gorgan-Rasht tectonic zone. These rocks crop out as large-volume pillow lavas and homogeneous fine- to coarse- grained gabbros and are essentially composed of Clinopyroxene (augite), plagioclase and relatively abundant small apatite needles. Geochemical data clearly identifies an enrichment of LREE and positive anomalies of Nb and Ti suggesting an intra-plate ocean island (OIB) tectonic setting. Considering the LREE/HREE ratio and some of other incompatible element contents, it seems that the alkaline rocks are probably derived from a garnet lehrzolitic mantle.

کتابنگاری
آقانباتی، ع.، 1383- زمین­شناسی ایران. سازمان زمین شناسی و اکتشافات معدنی کشور، 586 صفحه.
افتخارنژاد، ج.، 1359- تفکیک بخش­های مختلف ایران از نظر وضع ساختمانی در ارتباط با حوزه­های رسوبی، نشریه انجمن نفت، شماره 82.
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صلواتی، م.، ١٣٨٠- بررسی زمین شناسی و پتروژنز سنگ‌های ماگمایی منطقه جنوب املش، رساله کارشناسی ارشد، دانشگاه تهران. دانشکده علوم، 159 صفحه.
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