پترولوژی و ژئوشیمی سنگ‌ های آتشفشانی ائوسن جنوب شرق خور (استان اصفهان،ایران مرکزی)

زمین شناسی اقتصادی

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 28 آذر 1400  

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2021.68731.1007

نویسندگان

پانیذ شادمان؛ قدرت ترابی

گروه زمین شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران

چکیده

سنگ­های آتشفشانی ائوسن با ترکیب تراکی بازالت و تراکی آندزیت بازالتی در جنوب شرق شهر خور (استان اصفهان) در راستا و نزدیک گسل ترکمنی- اردیب رخنمون خوبی دارند. این منطقه در زون ساختاری خرد­قاره ایران مرکزی و حاشیه شرقی بلوک یزد واقع شده است. بافت غالب این سنگ­ها پورفیریتیک، میکرولیتیک پورفیریتیک، پوئی کیلیتیک و گلومروپورفیریتیک است. الیوین، پلاژیوکلاز، کلینوپیروکسن و ارتوپیروکسن کانی­های اصلی سازنده این سنگ ها بوده که به صورت فنوکریست دیده می شوند. این سنگ ها کالک ­آلکالن هستند. در این منطقه علاوه بر گدازه‌ها،  نهشته ­های آذر آواری که عمدتا شامل توف می­باشد نیز وجود دارند. تشکیل افق بنتونیتی منطقه خور، محصول دگرسانی این توف­ها می­ باشد. الگوی عناصر مختلف بهنجارشده به کندریت و گوشته اولیه حاکی از غنی شدگی از LREE و LILE و تهی­ شدگی از عناصر گروه HFS (نظیر Ti، Ta و Nb) می باشد که از مشخصه­ های ماگماهای مرتبط با فرورانش است. الگوهای بسیار مشابه این سنگ ها از نظر عناصر نادر خاکی و ناسازگار در نمودارهای بهنجارسازی، گویای پتروژنز یکسان این سنگ ها است. محیط زمین ساختی سنگ­های آتشفشانی احتمالا یک کمان ماگمایی وابسته به فرورانش در حاشیه خرد­­قاره ایران مرکزی بوده است. مشخصات ژئوشیمیایی نشان می­ دهد که ماگمای سازنده سنگ­های منطقه احتمالا در اثر ذوب­بخشی گوه گوشته ­ای متاسوماتیزه شده در بالای اسلب فرورونده ایجاد گردیده و محصول ذوب­ بخشی یک اسپینل لرزولیت گوشته لیتوسفری بوده است.

کلیدواژه‌ها

پترولوژی؛ سنگ های آتشفشانی؛ ائوسن؛ خور؛ اصفهان؛ خرد قاره ایران مرکزی

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