پتروژنز ماگماتیسم میان چینه ای تریاس شمال شهرضا بر مبنای شیمی کلینوپیروکسن (جنوب اصفهان، پهنه سنندج-‌سیرجان)

زمین شناسی اقتصادی

مقاله 6، دوره 12، شماره 2 - شماره پیاپی 25، 1399، صفحه 249-265   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v12i2.78723

نویسندگان

شهزاد شرافت^* ؛ مریم منانی

دانشگاه پیام نور

چکیده

کربنات­ های تریاس پیشین شمال شهرضا، میزبان 4 افق­ آذرین موازی میان­ چینه­ ای بازیک با ترکیب سنگ­ شناسی الیوین ­بازالت تا بازالت کوارتزدار هستند. این سنگ ­ها دارای بافت اینترسرتال تا اینترگرانولار بوده و پلاژیوکلاز، کلینوپیروکسن، الیوین، آمفیبول و کوارتز کانی‌های اصلی آنها را تشکیل می ­دهند. کلینوپیروکسن­ ها حاوی مقادیر بالایSiO2  و  MgO بوده و محتوای Al2O3 و Na2O  آنها پایین است. نسبت­ های متوسط AlVI/AlIV کلینوپیروکسن (05/0‌-‌01/0)، نشان‌دهنده تبلور ماگما در شرایط فشار متوسط است. دمای تبلور کلینوپیروکسن‌ها از 1150 تا 1200 درجه سانتی­ گراد متغیر است. بر اساس ویژگی­ های ژئوشیمیایی کلینوپیروکسن، ماهیت ماگمای سازنده تولئیتی و فوگاسیته اکسیژن در زمان تبلور نسبتاً پایین بوده ­­است. میان­ چینه ­ای بودن با رسوبات کربناته، تولئیتی‌بودن سرشت ماگمایی و ویژگی زمین ­ساختی پشته­ های میان­ ا­­­قیانوسی نشان‌دهنده ارتباط افق­ های آذرین با یک رژیم زمین ­ساختی کششی است. افق­ های بازیک مزبور احتمالاً از یک ماگمای تولئیتی و در یک رژیم زمین‌ساختی کششی کافت‌زایی که به گسترش پوسته اقیانوسی نئوتتیس در زمان تریاس آغازین در جنوب اصفهان انجامیده است، تشکیل شده ­اند.
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کلیدواژه‌ها

شیمی کلینوپیروکسن؛ ماگماتیسم میان‌چینه ای تریاس؛ سرشت تولئیتی؛ شهرضا؛ جنوب اصفهان؛ پهنه سنندج-‌سیرجان

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