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

زمین شناسی اقتصادی

مقاله 14، دوره 14، شماره 1 - شماره پیاپی 32، 1401، صفحه 157-184   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2021.68731.1007

نویسندگان

پانیذ شادمان¹؛ قدرت ترابی^{* 2}

¹دانشجوی دکتری، گروه زمین‌شناسی، دانشگاه اصفهان، اصفهان، ایران

²استاد، گروه زمین‌شناسی، دانشگاه اصفهان، اصفهان، ایران

چکیده

سنگ ­های آتشفشانی ائوسن با ترکیب تراکی بازالت و تراکی آندزیت بازالتی در جنوب‌شرق شهر خور (استان اصفهان) در راستا و نزدیک گسل ترکمنی- اوردیب، رخنمون خوبی دارند. این منطقه در زون ساختاری خرد­ قاره ایران مرکزی و حاشیه شرقی بلوک یزد واقع‌شده است. بافت غالب این سنگ­ها پورفیریتیک، میکرولیتیک پورفیریتیک، پوئی کیلیتیک و گلومروپورفیریتیک است. الیوین، پلاژیوکلاز، کلینوپیروکسن و ارتوپیروکسن کانی ­های اصلی سازنده این سنگ‌ها بوده که به صورت فنوکریست دیده می‌شوند. این سنگ‌ها کالک ­آلکالن هستند. در این منطقه علاوه بر گدازه‌ها،  نهشته­ های آذرآواری که اغلب شامل توف است، نیز وجود دارند. تشکیل افق بنتونیتی منطقه خور، محصول دگرسانی این توف ­هاست. الگوی عناصر مختلف بهنجارشده به کندریت و گوشته اولیه بیانگر غنی‌شدگی از LREE و LILE و تهی­ شدگی از عناصر گروه HFS (نظیر Ti، Ta و Nb) است که از ویژگی‌های ماگماهای مرتبط با فرورانش است. الگوهای بسیار مشابه این سنگ‌ها از نظر عناصر نادر خاکی و ناسازگار در نمودارهای بهنجارسازی، گویای پتروژنز یکسان این سنگ‌هاست. محیط زمین‌ساختی سنگ­ های آتشفشانی احتمالاً یک کمان ماگمایی وابسته به فرورانش در حاشیه خرد ­­قاره ایران مرکزی بوده است. ویژگی زمین‌شیمیایی نشان می­دهد که ماگمای سازنده سنگ ­های منطقه احتمالاً در اثر ذوب ­بخشی گوه گوشته ­ای متاسوماتیزه شده در بالای اسلب فرورونده ایجاد شده 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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