دوره 32، شماره 2 - ( 5-1403 )                   جلد 32 شماره 2 صفحات 338-325 | برگشت به فهرست نسخه ها


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گروه زمین‌شناسی، دانشگاه پیام نور، تهران، ایران
چکیده:   (178 مشاهده)
توده گرانیتوئیدی غرب اردکان با مجموعه کانی‌های اصلی کوارتز، ارتوکلاز، پلاژیوکلاز و کانی‌های فرعی آمفیبول، بیوتیت، اسفن، زیرکن و آپاتیت در بخش میانی پهنه ایران مرکزی رخنمون دارد. بافت غالب در این توده دانه­ای متوسط تا ریز، گرانوفیری و میرمیکیتی است. بر اساس داده‌های شیمی کانی‌، آمفیبول‌های کلسیمی با ماهیت منیزیوهورنبلند تا اکتینولیت در دمای oC 890-530  متبلور شده‌اند. همزمان، کانی پلاژیوکلاز نوع الیگوکلاز تا آندزین در oC 700-800 و بیوتیت‌های منیزیم‌دار در دمای oC 730-650 متبلورشده‌اند. همچنین با توجه به شرایط اکسایشی، کانی‌های کدر نوع مگنتیت تشکیل شده‌اند. داده­های شیمی همه این کانی‌ها به ماهیت گوشته‌ای ماگمای سازنده آنها اشاره دارد، که طی صعود دچار آلایش پوسته‌ای متوسط تا شدید شده‌اند. این توده‌ها با سرشت آهکی قلیایی از نوع I هستند که در موقعیت زمین‌ساختی فرورانش در ارتباط با کرانه قاره‌ای فعال تشکیل شده‌اند
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

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