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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