دوره 29، شماره 4 - ( 10-1400 )                   جلد 29 شماره 4 صفحات 746-733 | برگشت به فهرست نسخه ها


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Poormoradian Barfeh, brahimi, Nabatian, Moradian, Abbaslu. Petrology of rocks in the Karik area, east of Meiduk mine of volcanic. www.ijcm.ir 2021; 29 (4) :733-746
URL: http://ijcm.ir/article-1-1676-fa.html
پورمرادیان برفه علیرضا، ابراهیمی محمد، نباتیان قاسم، مرادیان عباس، عباسلو زهرا. سنگ‌شناسی سنگ‌های آتشفشانی منطقه کاریک، شرق معدن مس میدوک. مجله بلورشناسی و کانی شناسی ایران. 1400; 29 (4) :733-746

URL: http://ijcm.ir/article-1-1676-fa.html


1- دانشگاه زنجان
2- دانشگاه شهید باهنر کرمان
3- معدن مس میدوک
چکیده:   (1092 مشاهده)
پیرامون روستای کاریک در شرق معدن مس میدوک، سنگ­های آتشفشانی (بازالت آندزیتی، آندزیت، داسیت و ریولیت) و سنگ­های آذرآواری (آگلومرا و توف) ائوسن رخنمون دارند. این سنگ‌ها با تعدادی دایک‌ با ترکیبب آندزیتی قطع شده‌اند. بافت­های اصلی سنگ­های آتشفشانی پورفیری و جریانی هستند. کانی­های پلاژیوکلاز، فلدسپار قلیایی، کوارتز، کلینوپیروکسن، آمفیبول، بیوتیت و کانی‌های کدر در سنگ‌های مورد بررسی به صورت درشت‌بلور و بلورهای ریز وجود دارند. همچنین، فلدسپار (بیشتر پلاژیوکلاز) به صورت ریزبلورهای میله­ای جهت‌یافته دیده می‌شود. گاهی در درشت‌بلورهای پلاژیوکلاز، بافت­های غیرتعادلی چون بافت غربالی، تحلیل‌یافتگی و منطقه‌بندی مشاهده می‌گردند. کوارتزها لبه­های تحلیل یافته دارند. آمفیبول­ها و بیوتیت­ها از لبه‌ها به اکسیدهای آهن و تیتانیم تبدیل شده‌اند. تشکیل این بافت­ها را می­توان به فرایندهایی چون آمیختگی ماگمایی، تغییرات فشار بخار آب و کاهش فشار ناشی از صعود سریع ماگما مربوط دانست. سنگ­های آتشفشانی منطقه کاریک از سری ماگمایی آهکی قلیایی و بیشتر متاآلومین هستند. نمودارهای چندعنصری سنگ‌های مورد بررسی بهنجار شده‌ نسبت به کندریت و گوشته اولیه دارای ناهنجاری منفی عناصر با شدت میدان بالا چون P، Nb،Ta  و Ti هستند که از ویژگی‌های ماگماهای وابسته به مناطق فرورانش است. ناهنجاری مثبت شدید Pb در سنگ‌های مورد بررسی ناشی از آلایش پوسته‌ای است. الگوی عناصر خاکی نادر بهنجار شده به کندریت سنگ­های آذرین منطقه کاریک به نسبت هموار و دارای غنی‌شدگی عناصر خاکی نادر سبک (LREE) نسبت به عناصر خاکی نادر سنگین بوده که به احتمال بسیار به دلیل فراوانی LREE ها در خاستگاه و یا آلایش پوسته‌ای است. بر اساس شواهد سنگ‌شناسی و زمین شیمیایی، سنگ‌های آتشفشانی منطقه کاریک در یک محیط کمان فعال کرانه قاره‌ای و بر اثر فرورانش سنگ کره اقیانوسی نئوتتیس به زیر خرده‌قاره ایران مرکزی تشکیل شده‌اند.    
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

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