دوره 32، شماره 2 - ( 5-1403 )                   جلد 32 شماره 2 صفحات 214-197 | برگشت به فهرست نسخه ها


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1- گروه زمین شناسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2- گروه زمین شناسی، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
3- گروه زمین شناسی، دانشگاه لرستان، خرم آباد، ایران
4- گروه زمین شناسی، واحد کهنوج، دانشگاه آزاد اسلامی، کهنوج، ایران
چکیده:   (895 مشاهده)
منطقه حسین آباد در 120 کیلومتری  جنوب شرقی زنجان واقع است. سنگ­های آتشفشانی در این منطقه دارای سن ائوسن و جوانتر از آن هستند. سنگ­های آتشفشانی طیفی از گدازه­های داسیتی، تراکی آندزیتی و آندزیتی به همراه توف را شامل می­شوند. از نظر کانی­شناسی، سنگ­های آتشفشانی مورد بررسی دارای کوارتز، فلدسپات قلیایی، پلاژیوکلاز فراوان، پیروکسن و آمفیبول هستند. فلدسپات قلیایی از نوع سانیدین و پلاژیوکلازها از نوع الیگوکلاز و آندزین هستند. بافت­های پورفیری، پورفیری ریزسنگی، گلومرو پورفیری و خال خال بافت در این سنگ­ها غالب هستند. بررسی شیمی کانی­های سنگ­های منطقه نشان می­دهد که ترکیب کلینوپیروکسن­های این سنگ­ها از انواع دیوپسید و اوژیت است. آمفیبول موجود در این سنگ­ها از نوع ماگمایی و کلسیمی و دارای ترکیب شیمیایی پارگازیت است. بر اساس نمودارهای تعیین نوع ماگما، ماگمای سازنده سنگ­های آتشفشانی منطقه مورد بررسی قلیایی است. نمودارهای دما-فشارسنجی بر پایهی ترکیب پلاژیوکلاز، پیروکسن و آمفیبول نشان­دهنده دمای 700 تا 750 درجه سانتیگراد و فشار 5 تا 6.5 کیلوبار هستندکه با ژرفای پوسته میانی-زیرین همخوانی دارد. از این رو، این سنگ­ها در یک کرانه فعال قاره­ای تشکیل شده­اند.
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

فهرست منابع
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