بررسی شیمی کانی‌های پیروکسن و پلاژیوکلاز در تعین خاستگاه تکتونیکی و زمین دماسنجی سنگ‌های ماگمایی حیدری، شمال شهرکرد، پهنه سنندج سیرجان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 'گروه زمین شناسی، دانشگاه پیام نور، تهران، ایران

2 گروه زمین شناسی، دانشگاه پیام نور، تهران، ایران

چکیده

منطقه مورد مطالعه از نظر ساختاری در بخش میانی پهنه سنندج- سیرجان و در شمال شهرکرد واقع شده‌است. در این منطقه مجموعه سنگ‌های ماگمایی بازالت، اندزیت بازالتی ، آندزیت ، گابرو و دیوریت رخنمون دارند. بررسی‌های سنگ‌نگاری نمونه‌های حدواسط نشان دهنده حضور کانی‌های اصلی پلاژیوکلاز، اولیوین،پیروکسن، آمفیبول و کانی‌های فرعی بیوتیت و اسفن و اپاک می‌باشد. داده‌های شیـــمی کانی‌های پیروکسن به حضور کانی‌ اوژیت با ترکیب شیــمیایی Fs 13.72-17.48 En 43.01-45.63 Wo 37.32 – 40.07 دلالت می‌کند. همچنین پلاژیوکلازها دارای ترکیب شیمیاییAn 33.17-57.01 Ab 41.08-62.71 Or 0.98-4.9 و از نوع آندزین تا لابرادوریت می‌باشند. نتایج دما و فشارسنجی بر اساس ترکیب کلینوپیروکسن‌ها نشان می‌دهند که این کانی‌ها در دمای 1200 تا 1300درجه سانتی‌گراد و گستره فشار 6 تا 10 تبلور یافته‌اند. نتایج شیمی کانی کلینوپیروکسن‌‌های سنگ‌های ماگمایی منطقه حیدری نمایآنگر ماهیت کالک آلکالن این نمونه‌ها مرتبط با پهنه فرورانش می‎باشد.

کلیدواژه‌ها

موضوعات


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