نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکترا، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، ایران
2 دانشیار، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، ایران
3 استاد، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، ایران
4 دانشیار، گروه زمینشناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، ایران
چکیده
منطقه حرجند در شمال خاوری کرمان در پهنه ایران مرکزی و کمربند تکتونیکی کاشمر-کرمان قرار دارد. در این منطقه سنگهای گابرویی به همراه دایک‌های دلریتی در داخل سنگهای رسوبی سری دسو با سن اینفراکامبرین نفوذ کرده‌اند. گابروها و دایک‌های دلریتی ترکیب تقریباً یکسانی داشته و دارای کانی‌های اصلی کلینوپیروکسن و پلاژیوکلاز و کانی‌های فرعی اولیوین، آمفیبول، آپاتیت و کانی‌های کدر می‌باشند. بافت‌های موجود در این سنگ‌ها گرانولار متوسط تا ریز بلور و افیتیک تا ساب‌افتیک هستند. ترکیب پلاژیوکلاز این سنگ‌ها در گستره لابرادوریت (An53-67) قرار می‌گیرد، اما بواسطه سوسوریتی شدن در گابروها ترکیب اولیگوکلاز و در دایک‌های دلریتی ترکیب آلبیتی را نشان می‌دهند. ترکیب کانیایی کلینوپیروکسن‌ها از نوع کلینوپیروکسن‌های منیزیم-کلسیم-آهن‌دار و از نوع دیوپسید و اوژیت بوده و توزیع Al در ساختار کلینوپیروکسن‌ها تبلور آنها از یک ماگمای با فشار بخار آب متغیر و کمتر از 10 درصد را نشان می‌دهد. بر پایه ترکیب شیمیایی کلینوپیروکسن‌ها ماگمای سازنده سنگ‌ها غالبا ماهیت تولئیتی و کمتر آلکالن داشته و از لحاظ جایگاه زمین ساختی در ارتباط با محیط‌های درون صفحه‌ای هستند. ارزیابی زمین دما-فشارسنجی کلینوپیروکسن‌ها دمای تشکیل 1127 تا 1200 درجه سانتی‌گراد و فشار کمتر از 6 کیلوبار را برای این سنگ های مافیک نشان می‌دهد.
کلیدواژه‌ها
موضوعات
کتابنگاری
آهنکوب، م.، شبانیان، ن.، داودیان، ع.ر. و مکیزاده، م.ع.، 1391- شیمی کانی کلینوپیروکسن در سنگهای گابرویی گنبد نمکی درهبید، چهارمحال و بختیاری، ایران، مجله بلورشناسی و کانیشناسی ایران، شماره1، ص. 153 تا 168.
حاجیمیرزاجان، ح.، ملکزاده شفارودی، آ.، همام، س. م. و حیدریان شهری، م. ر.، 1396- ژئوشیمی و خاستگاه کانسنگ مگنتیت-اسپکیولاریت آپاتیتدار کانسار آهن دهزمان، شمالشرقی زون تکتونیکی کاشمر-کرمان، مجله زمینشناسی کاربردی پیشرفته، شماره 26.
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