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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 اصل مقاله (1.96 MB) | ||
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 | ||
مراجع | ||
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